This video introduces the Harvard CS50 course, which is a full university course that covers computer science. The video demonstrates how to create a simple program using drag and drop. The program prints "hello comma world" when the green flag is clicked. It also demonstrates how to create a more interactive program that asks a user's name and prints it back.
00:00:00 Harvard's CS50 course is a comprehensive introduction to computer science, taught by Dr. David Malin. The class is designed for students who are already familiar with programming, and is challenging but rewarding. The main goal of the class is for students to become self-sufficient in their programming skills, and to be able to use these skills to solve problems.
00:05:00 Computer science is the study of how to solve problems using computers. In this course, students learn how to program and think like a computer scientist. There are benefits to learning computer science, such as increased precision and accuracy. This is a simple example of how computers solve problems.
00:10:00 This video discusses how mathematical patterns can be found in binary, decimal, and other number systems, and how computers store and work with these patterns. The video also discusses how humans have standardized certain letters as numbers, and how this process works.
00:15:00 The ASCII code for information interchange is ASCII, and it began in the United States. ASCII includes a number of standard patterns that represent letters, numbers, and punctuation. A computer typically understands these patterns by heart, and can represent negative numbers as well.
00:20:00 This video is a presentation on computer science at Harvard. The vocabulary for talking about increasingly large quantities of data is introduced, and examples are given of how to represent numbers in different formats. The video also discusses Unicode, which is a standard for representing characters in many languages. Finally, the presenter talks about some issues that can arise when different companies interpret the same format.
00:25:00 The video explains how computers use zeros and ones to represent colors, letters, and numbers. It goes on to explain that video representation is similar to color representation, in that it is a sequence of images.
00:30:00 This 1-paragraph summary of a video about Harvard's CS50 university course describes how computers can represent information using zeros and ones, and how this process of information representation is what problem solving is all about.
00:35:00 The video provides a brief history of the development of algorithms, and demonstrates how an algorithm can be implemented on a computer. It then goes on to show how a phone book can be used to search for a person's name. A bug is then discussed, and the solution is demonstrated.
00:40:00 This video introduces the concept of programming, explaining that code is not a specific language, but a way of expressing an algorithm concisely. It goes on to introduce the concept of efficiency, explaining that an algorithm will typically take more time to solve if it is larger in size, and introduces the concept of pseudo code, which is a way of formally expressing an algorithm. Finally, it discusses how to formalize an algorithm, introducing the concept of step-by-step code.
00:45:00 This video discusses how to write code, focusing on the basics of pseudocode and functions. Pseudocode is a simplified version of actual code, which can be helpful in understanding how a program works. Programming languages tend to have similar features, such as conditionals and loops, and it can be difficult to understand them at first. However, with practice, these features can be easily understood.
00:50:00 In this video, Harvard CS50 instructor David Muller introduces the basics of computer programming languages, including C and Python. He also discusses scratch, a web-based or downloadable programming environment that lets users drag and drop puzzle pieces to create programs.
00:55:00 This video introduces the Harvard CS50 course, which is a full university course that covers computer science. The video demonstrates how to create a simple program using drag and drop. The program prints "hello comma world" when the green flag is clicked. It also demonstrates how to create a more interactive program that asks a user's name and prints it back.
This video provides an introduction to Harvard's CS50 course, which is a full university course in computer science. The course covers topics such as programming language syntax, code organization, and problem solving. The video also demonstrates how to write code using a text editor and compiler.
01:00:00 In this video, Harvard CS50 professor David Malan describes how programming works and how the function ask works. He also demonstrates how a simple program can be written using functions to manipulate values.
01:05:00 The video discusses Harvard's CS50 course, which is a full university course in computer science. The course introduces students to various programming constructs, including conditionals, loops, and functions. The video also shows an example of how to make a program more interactive by adding audio and sound effects.
01:10:00 In this video, Harvard CS50 instructor Michael Kennedy describes how to create a program that meows. He first shows how to create a program that repeats a block of code, and then shows how to create a program that is parameterized and takes an input, such as the number of times to meow.
01:15:00 In this video, Harvard's CS50 university course is described. The course covers the basics of computer programming, from how to write code to solving real-world problems. One of the most important skills learned in the course is how to identify and solve smaller problems, which leads to solving larger problems. The video also demonstrates how to interact with a cat by programming it to meow when the cursor is petted.
01:20:00 This video provides a brief overview of Harvard's CS50 course, which is a full university course in computer science. The course focuses on developing simple programming tools, and the video shows how one of the students' former professors' project used the camera to track the student's head and hit moles on the screen with a hammer.
01:25:00 The 1-paragraph summary for this video is that
the student implements a piece of functionality in a video game by implementing a floor and a trash can, and then adding a lamp post.
01:30:00 In this video, Harvard's CS50 course is explained, including the use of different programming techniques to create a simple maze game.
01:35:00 This YouTube video introduces the Harvard CS50 computer science course, which covers topics such as abstraction, movement, and code organization. The video presents an example of how the "feel for walls" function implements bouncing of a Yale symbol off of walls. The code for this function is shown, and it is explained how the code works. It is also explained how a more advanced adversary, in the form of a second sprite, could be implemented.
01:40:00 This video demonstrates how to make a computer game that is harder and harder as the player progresses. It features a game called "Ivy's Hardest Game" which was written by a former CS50 student.
01:45:00 This video introduces CS50, a full university course in computer science. The first week of the course focuses on learning the syntax of a traditional computer language, C. By the end of the course, students should be able to solve problems and write code correctly.
01:50:00 This video introduces the Harvard CS50 course, which is a full university course in computer science. One of the goals of the course is to help students write code that is correct according to specifications, and that is also stylish and easy to read. The video goes on to explain how to write code using a text editor, and how to compile and run the code.
01:55:00 This 1-minute video explains how to program in a language called C. It covers the basics of source code and how to convert it to machine code. The video also shows how to use a compiler to convert one language to another.
This video from Harvard's CS50 course covers the basics of how to write code in a programming language, including how to use functions, variables, and comments. The course also covers how to create a basic calculator program.
02:00:00 In this video, Harvard CS50 instructor Louis Rosen explains the command line interface (CLI) used in Linux. This interface is similar to the graphical user interface (GUI) used in Mac OS and Windows, but the CLI is faster and more concise. When making changes to a program, Linux users need to be aware that errors may occur if the file is deleted.
02:05:00 In this video, the Harvard CS50 computer science course is explained. The course covers the basics of computer programming, including functions, arguments, and output. The course also covers how to write code in a programming language, using the same syntax as in a human language. The course finishes with a discussion of how to use a compiler to create a program.
02:10:00 In this video, Harvard's CS50 course discusses functions, their inputs and outputs, and what types of values they can return. One difference between functions and other values in programming is that functions often have a specific "type" of input, such as a string, number, or color. Once a function has been declared, its inputs and outputs must be specified. Finally, we see an example of a function, get string, and see how it works.
02:15:00 The student demonstrates how a missing backslash n in a string can cause errors when compiling a program. He then demonstrates how to properly format a string for printing using printf.
02:20:00 In this video, Harvard CS50 instructor Michael Kennedy walks viewers through the basics of the C programming language. He covers topics such as how to create and run basic programs, how to use libraries, and how to handle errors. Kennedy also demonstrates how to use printf function to format input for the user.
02:25:00 In this video, Harvard CS50 instructor David Beazley walks through how printf can take multiple inputs. He also covers how variables can be declared within printf, and how string can be placed in front of get string.
02:30:00 The video discusses the differences between the programming languages C and Python. The video also compares and contrasts the programming paradigms of C and Python. The video concludes by discussing the importance of header files in C.
02:35:00 The video provides a full overview of Harvard's CS50 course, which covers topics such as printf and the standard library. It introduces the concept of a library, which is a collection of functions that are pre-configured and accessible from within a program. Next, the video focuses on the importance of using a library when programming in C. Finally, the instructor discusses how to create and use folders on a computer, and how to use the command line to perform common tasks.
02:40:00 The video demonstrates how to use the commands in the cs50 (computer science) library. One command is "printf", which prints a string or number. Another command is "get", which retrieves a string or number from the user.
02:45:00 In this video, Harvard CS50 professor Josh Waitzkin explains the basics of C programming, including data types, operators, and syntax.
02:50:00 This 1-paragraph summary of a YouTube video titled "Harvard CS50 – Full Computer Science University Course" covers the basics of how to write code in a programming language, and how to create a calculator program. The video also covers how to improve the design of a program by considering style and intended use.
02:55:00 The video discusses how Harvard's CS50 course teaches programming using common variable names like "X" and "Y", and how comments with a slash can be used to remind oneself of what a program does. The video goes on to explain how autocomplete can be used to help remember these variable names, and how one might implement a correct calculator using long integers.
This video introduces the Harvard CS50 course, which covers the basics of computer science. The course uses conditional statements and boolean expressions to ask questions and get answers. The video shows how to do this in scratch and in the C programming language.
03:00:00 This video introduces the Harvard CS50 course, which covers the basics of computer science. The course uses conditional statements and boolean expressions to ask questions and get answers. The video shows how to do this in scratch and in the C programming language.
03:05:00 In this video, Harvard CS50 instructor David Levy discusses how conditionals work in code and how to write code that is both correct and well-designed. He also gives an example of a magic number in programming, which is a variable that never changes.
03:10:00 In this video, Harvard CS50 instructor Michael Nielsen explains the basics of programming with conditional statements, loops, and constants. In particular, he covers how to determine if a number is even or odd using the remainder operator.
03:15:00 The video discusses Harvard's CS50 course, which covers computer science concepts in a comprehensive way. It explains that humans design languages, and that if you're ever frustrated by or confused by them, it might just not have been the best design. The video goes on to discuss how to solve a problem where the user needs to agree to something, and how to do it using two equality signs. The video also covers how to tolerate uppercase and lowercase letters.
03:20:00 The video covers Harvard's CS50 course, which covers computer science fundamentals. The video discusses how to write code for loops, explaining that there are special keywords for true and false that indicate whether the loop will continue or not. The video also covers how to write code to repeat a task a finite number of times.
03:25:00 The video discusses the Harvard CS50 computer science course, which covers basic programming constructs such as loops and conditional statements. It also covers more advanced concepts, such as for loops and where variables are stored. The course emphasizes convention over code correctness, and shows how to do the same thing in multiple ways.
03:30:00 This video covers the differences between for and while loops, as well as how to create a meow function. It also demonstrates how to fix an error in a for loop.
03:35:00 The video explains that C is a language that is old school and reads code top to bottom. If you don't know what a particular function is called, C will print out an error message. There is a solution to this, which is to put functions in different orders, but it is still annoying. Another solution is to put functions in their own files, with a header file that declares what functions are available.
03:40:00 The video shows how to create a function to discount prices, and how to use that function in a program. The function is called "discount", and takes an input of the regular price of an item, as well as a percentage discount. The regular price is then multiplied by 0.85 to get the sale price.
03:45:00 In this video, Harvard CS50 instructor Michael Nielsen demonstrates how to code a simple game in C using primitives, including an escape character to move the prompt. He also shows how to print the game output on a new line.
03:50:00 The video discusses the use of do while loops in programming. A do while loop is similar to a while loop, but it checks the condition last instead of first. This is helpful when you want to do something no matter what first and then check some condition or boolean expression to see if maybe in this case the user cooperated.
03:55:00 In this video, Harvard CS50 instructor David M. Smith explains how to modify the format codes for floats to get two digits of precision. He also shows how to remake the calculator for different formats.
This video covers the basics of Harvard's CS50 course, which is a four-year course that covers everything from programming to algorithms. The video explains how to use the make utility to compile code, and how to use a debugger to step through code and fix bugs.
04:00:00 In this video, Harvard CS50 instructor David Malan explains how floating point values can overflow, and how to solve the problem using type conversion.
04:05:00 The video discusses Harvard's CS50 computer science course, which is a four-year course that covers basic to advanced computer science topics. The course covers a variety of topics, including how to count and represent numbers, how to solve logical problems, and how to write code. In 2038, computers may experience a problem due to the number of seconds that have passed since 1970, which is when the epoch was defined. This problem will be solved by increasing the number of bits used to store time.
04:10:00 In this video, CS50 instructor David Goldberg covers the basics of C, which is the programming language used in the course. Goldberg explains that when writing code, it's important to understand the underlying operations and data structures. He also provides a solution to a problem that he experienced in a previous course.
04:15:00 In this video, the author explains how to compile a program using make. After discussing the different options available for command line arguments, the author shows how to use clang to compile the program on their own computer.
04:20:00 In this video, Harvard's CS50 course is explained in detail. The course covers all the basics of computer science, from programming to algorithms. The use of make, which automates the compilation process, is also mentioned.
04:25:00 The pre-processing step of the compiler is finding and replacing any code that starts with a hash symbol with the corresponding prototypes from cs50.h. The next step is compiling the code, which turns it into machine code that the computer can understand.
04:30:00 In this video, Harvard CS50 instructor David Malan explains the three steps in compiling code - pre-processing, assembly, and linking - and how they work together to produce a final, executable file.
04:35:00 In this video, Harvard CS50 instructor Julia Silge explains the concept of compiling. She states that compiling is "these four things but we'll focus on it just as a higher level concept and abstraction if you will known as compiling itself." She goes on to explain that debugging techniques include using functions such as printf to diagnose problems. Silge also mentions the Logical Error, which is a bug that has been around for some time.
04:40:00 This video explains how to use a debugger to step through code. The code in this example has a bug, and by using a debugger, the programmer can see where the bug is and fix it.
04:45:00 The video discusses debugging techniques for computer science students, including printf debugging, rubber duck debugging, and step into and step out. It also covers the difference between step over and step into.
04:50:00 In this video, Harvard CS50 instructor Dan Meyer discusses the types of data that can be handled by C. He discusses how to formally define these types and shows how to use these definitions to write more sophisticated programs.
04:55:00 In C, a program that needs to average three scores can do this by using the printf function and int arguments. When the program is run, it will print out "percent F" and the average of score one, score two, and score three divided by three.
This video discusses the Harvard CS50 computer science course, which covers topics such as iteration, functions, data structures, and loops. The student demonstrates how to improve efficiency within a for loop by declaring multiple variables at once.
05:00:00 In this video, the author explains how to calculate an average score in C using a fixed number of variables. In the future, this same program could potentially become messy if more scores were added. The author also points out that there are better ways to do things in languages like C, such as using arrays.
05:05:00 This YouTube video introduces a new syntax for declaring arrays in programming languages, called square brackets. Using this notation, you can store multiple values in the same variable.
05:10:00 In this video, Harvard CS50 student Michael Kennedy explains how arrays can be used to store multiple values in a single variable, and how to use a for loop to calculate the average of three numbers.
05:15:00 In this video, Harvard CS50 instructor Michael S. Hart discusses how strings are implemented in computer memory, and how charging to integers can simplify code.
05:20:00 In this video, Harvard CS50 professor Michael Nielsen discusses how strings are represented in memory. He reveals that a string can be any number of bytes long, and that strings are delimited by a special character known as a null.
05:25:00 In this video, Harvard CS50 instructor David Brown explains how strings are represented in computer memory and how to solve problems that involve strings. He also mentions that strings can be interpreted in different ways by different programs, depending on their context.
05:30:00 This CS50 video discusses the benefits of standardizing the size of variables in code, as well as the issue of variables ending with a null character. The code example shown uses a for loop to calculate the length of a string stored in a variable.
05:35:00 This video introduces the concept of abstraction, which is the process of breaking down complex problems into simpler ones. The video then goes on to talk about how to create a function that calculates the length of a string. Finally, the video provides an example of how manual pages work and how the prototype of a function can be used to determine its inputs and outputs.
05:40:00 This video explains how to print strings in code without using percent signs. One way to do this is by printing each letter in the string and looping over the characters.
05:45:00 The video discusses Harvard's CS50 computer science course, which covers iteration, functions, data structures, and loops. The student demonstrates how to improve efficiency within a for loop by declaring multiple variables at once.
05:50:00 In this video, Harvard CS50 instructor Michael Sipser demonstrates how to convert lowercase characters to uppercase using the ASCII chart and the islower function. The function returns a nonzero integer if the character is lowercase, and zero if the character is not lowercase.
05:55:00 The video discusses how to use a function to automatically uppercase characters in a string.
The video Harvard CS50 - Full Computer Science University Course introduces the viewer to the course, explains how command line arguments work, and demonstrates how to find a number in a phone book using binary search.
06:00:00 In this video, Harvard CS50 instructor David Maloney explains how command line arguments work in C. He shows how to write a program that takes command line arguments and prints them out.
06:05:00 This video discusses the Harvard CS50 computer science university course and provides a transcript of a video explaining how command line arguments work. The video also includes an explanation of how to take command line arguments.
06:10:00 In this video, the author discusses how to signal to the user whether something was successful or not using the return value from Main. He also explains how to exit a program using the various exit statuses.
06:15:00 In this video, Harvard CS50 instructor Sebastian Thrun discusses how grade level affects the reading level of texts. He provides an example of a book for young students and one for adults, and explains that the grade level for a book can be determined by the complexity of the words and the number of sentences. He also mentions the concept of cryptography, and explains that when sending a message, plain text is the original, unencrypted text, while ciphertext is the encrypted text.
06:20:00 In this video, CS50 lecturer Ramanathan talks about arrays and how they are used to store data. He also explains how computers represent data in memory and how humans can understand it better by using a bird's eye view.
06:25:00 In this video, Harvard CS50 instructor David Blum talks about computer science algorithms, correctness, design, and efficiency. He introduces the concept of Big O notation, which measures the running time of an algorithm in terms of its complexity. He discusses how to focus on the second characteristic of an algorithm - its efficiency. Blum emphasizes the importance of good design, and how a program's running time can be a good indicator of its quality.
06:30:00 In this video, the Harvard CS50 computer science course is introduced. The course covers algorithms, with the first two algorithms being described as taking end steps and n divided by two steps, respectively. The third algorithm is described as taking on the order of n steps, or on the order of n over two. These three algorithms are functionally equivalent, but the first two algorithms look better in bed and get larger as n gets larger.
06:35:00 In this video, Harvard CS50 instructor Salman Khan explains the meaning of upper and lower bounds and how they are used in algorithms. He also introduces the concept of over time examples, which will be useful later in the course. Finally, he asks a volunteer to find a number in an array and the volunteer successfully completes the task.
06:40:00 The algorithm in the video Harvard CS50 - Full Computer Science University Course is a linear search. If the number is behind one of the doors in the array, then the algorithm returns true. Otherwise, at the end of the program, it returns false.
06:45:00 The video discusses the running time of an algorithm, and how it depends on the number of doors in the array being searched. The algorithm can be described with the notation Omega of n, where n is the size of the array. If the number being searched is at the beginning of the array, the algorithm will take one step, and if it is at the end of the array, it will take n steps.
06:50:00 The video demonstrates how to find a number in a phone book using binary search. Binary search is an efficient algorithm that is based on the assumption that numbers are in sorted order from small to large.
06:55:00 This video introduces the binary search algorithm and explains the O(log n) and Omega(log n) notation for running time. It also discusses the best and worst case scenarios for the algorithm. Finally, the video demonstrates how Google might decide whether to sort the data first or search it more efficiently.
This YouTube video provides a tutorial on Harvard's CS50 computer science course, which covers the basics of computer programming. The video begins by discussing the ith person iteration concept and data types. It then goes on to show how to create and use your own structures. The video finishes with a brief discussion on how to sort data using different algorithms.
07:00:00 In this video, Harvard CS50 instructor Ravell Rodrigues explains the difference between linear search and binary search. He also shows how to implement linear search in code.
07:05:00 In this video, Harvard CS50 instructor David Molnar introduces the string data type in C, and shows how to compare two strings. He also warns of potential errors in equality checking.
07:10:00 The video demonstrates how to implement a function that compares two strings case-sensitively, returning an integer if the strings are "equal" (i.e. the same letter-by-letter), and a false value if they are not. The video also covers how to implement a function to search for a string in a list of strings.
07:15:00 The video discusses Harvard's CS50 computer science course, which covers topics such as linear search and arrays. The presenter demonstrates how to write a program to implement a phone book, but points out that the design of the program is not well-done. The presenter suggests that, if the program is to be used for anything other than simple data storage, it should be designed more carefully.
07:20:00 In this video, the author proposes that C developers can create their own data types, called structures, by defining a type and a name inside of a structure. The type can then be referred to using the keyword 'type'. The author shows an example of creating a structure called 'person' and then iterating through the structure to access its variables.
07:25:00 This YouTube video provides a tutorial on Harvard's CS50 computer science course, which covers the basics of computer programming. The video begins by introducing the ith person iteration concept, and shows how to more verbosely write a program that compares the name of David to before. It then goes on to discuss data types and how to encapsulate information in a person. The video finishes with a brief discussion on how to create and use your own data structures.
07:30:00 This video introduces the Harvard CS50 course, which is a full university course in computer science. The course covers various topics, including prototypes and defining anything you're going to use before using it. The course also discusses how to store data using different types of storage, such as strings and arrays. Finally, the video discusses how sorting data can be a faster option than searching or not sorting at all.
07:35:00 The video explains how to sort an array of integers using an algorithm. The sorted array will have a zero at the end, and each number will be in a different order. The video then introduces a volunteer to the stage, who demonstrates how to sort the integers using a different algorithm. The volunteers then return to their seats, and the video concludes with a discussion of how to translate the sorting algorithm to code.
07:40:00 In this YouTube video, Harvard CS50 instructor Celeste Thorson discusses how to solve problems by breaking them down into smaller, easier-to-solve pieces. She suggests using one variable to remember the smallest element and then solving smaller problems using that information.
07:45:00 In this video, Harvard CS50 students discuss the efficiency of the selection sort algorithm. The pseudo code they use to describe the algorithm is somewhat cryptic at first, but it is a very efficient way of describing what they did.
07:50:00 This video describes how the running time of selection sort, an algorithm in computer science, is N squared.
07:55:00 The video discusses the Bubble Sort algorithm, which is a sorting algorithm that works differently at least, but may be better or worse depending on the circumstances. The pseudo code for the algorithm is described, and it is shown that the algorithm repeats n minus 1 times, which is why it takes n minus 1 steps to sort an array of n elements. The running time of the algorithm is estimated to be n minus 1 squared, which is negligible.
This video series introduces the basics of computer science, including recursion, sorting algorithms, and hexadecimal representation. It also covers more advanced topics such as pointers and memory addresses.
08:00:00 The video explains how bubble sort and selection sort compare in terms of performance. Bubble sort is faster than selection sort, but selection sort is faster than Omega sorting.
08:05:00 In this video, Harvard CS50 professor Yaron Sheffer discusses the recursive programming technique known as recursion. This technique is used in the binary search algorithm, which is a sorting algorithm that is faster than selection sort and bubble sort.
08:10:00 In this video, Harvard CS50 instructor Michael Nielsen introduces the "left-the-line pyramid" problem, and shows how to solve it in C code using iteration. The final code prints out the desired pyramid, side-by-side with a screenshot of the program in action.
08:15:00 This YouTube video discusses the cyclical argument right kind of obnoxious to do typically in English or in a spoken language, and how it can be used to code recursive functions. The video shows an example of how a function can be written using this approach, and how to stop the process when the desired outcome is reached.
08:20:00 This video covers the basics of computer science, including recursion. It discusses how merge sort works by splitting a problem into smaller pieces, and how to use recursion to avoid endless recursive calls.
08:25:00 In this video, Harvard CS50 instructor Michael Nielsen explains the algorithm for sorting an array of numbers. The algorithm consists of first sorting the left half of the array, then the right half, and finally merging the two sorted halves together.
08:30:00 In this video, Harvard CS50 student discusses how merge sort works on data sets that are not always sorted. Merge sort is faster than linear search, but takes more memory.
08:35:00 This video shows how three algorithms can be used to visualize an image, select a portion of the image, and then merge it into the rest of the image.
08:40:00 This video explains how graphical tools, such as Photoshop, represent colors using hexadecimal values. It also discusses how these values can be combined to create other colors.
08:45:00 In this video, Harvard CS50 instructor David Malan explains how hexadecimal (base 16) is used to represent numbers. This system is different from binary and decimal, which use powers of 2 and 10, respectively. Hexadecimal allows for counting up to 255, which is greater than the number of symbols in binary and decimal.
08:50:00 This YouTube video provides a short introduction to the hexadecimal system, which is used to represent numbers in computer memory. The video then introduces the concept of memory bytes, which are counted using hexadecimal. The video concludes with a discussion of a code example that uses hexadecimal to initialize a variable.
08:55:00 In this video, Harvard CS50 lecturer Stefan Weil introduces the concepts of pointers and memory addresses. He explains that pointers store the address of a value, and shows how to use the ampersand and star operators to create pointers.
This video covers the Harvard CS50 course, which covers topics related to computer programming and data structures. The instructor explains how pointers are used to store values and how they can be used to access the memory addresses of variables. Additionally, the video discusses how strings are stored in memory and how to create a copy of a string.
09:00:00 In this video, Harvard's CS50 course is covered. After introducing the basic concepts of pointers and addresses, the instructor shows how to use the star operator to print the address of a variable. This use of the star operator is technically contradictory to what was just explained, but it is a common use. Additionally, stack overflow and heap overflow are also discussed.
09:05:00 This video explains the use of pointers in computer programming, and discusses how pointers can be used to access the memory addresses of variables. It also provides an example of how a pointer can change its memory address each time it is executed.
09:10:00 In this video, Harvard CS50 professor David Wolpert discusses the basics of pointers and addresses. Wolpert discusses how pointers are similar to postal addresses, and how they are useful for storing values. He also demonstrates how to use pointers in code.
09:15:00 In this video, Harvard CS50 instructor David Noble discusses how C stores and works with strings. He explains that C strings are not officially part of the language, but are instead a common term used by programmers. He goes on to say that strings are an array of characters, and that if you want to see an example of a string in use, you can look at this code: "string creating a tiny bit of code that uses the word string."
09:20:00 In this video, Harvard CS50 instructor David Sax explains how strings are stored in computer memory. Strings are represented as a variable that is a pointer to the first character in the string.
09:25:00 In this video, Harvard CS50 instructor Michael Kennedy discusses the basics of strings and how they work. He explains that strings are not actually data types in C, but are instead programmer terminology for a Char variable with a space appended. He goes on to show how to create and print the address of a string variable. Finally, he demonstrates how to create a copy of a string.
09:30:00 In the video, Harvard CS50 instructor Michael S. Kennedy demonstrates how to write a program that prints the address of each character in a string. This is useful for demonstrating that strings are not simply a collection of characters, but are instead a "char star" (a sequence of characters that is represented by a single character in memory).
09:35:00 In this video, Harvard CS50 lecturer David Whittle walks through the basics of data structures and how to use pointers to access and manipulate data in memory. He emphasizes the importance of using star symbols (Char star) to make data types more readable, as string is now synonymous with Char star. Finally, he demonstrates how to print out data stored in a string using printf.
09:40:00 This video discusses how to use square bracket notation for strings in CS50, Harvard's full computer science university course. The syntax is more readable and less boastful than the syntax used last week. The square brackets are an abstraction on top of lower level math.
09:45:00 The video discusses Harvard's "CS50" full computer science university course, which covers topics such as pointer arithmetic, arrays, and strings. The video notes that, although the compiler is smart enough to handle most arithmetic, you can use the "strictly speaking" notation to explicitly tell the compiler what type of data you're working with. The video then discusses how to change a program to compare strings instead of integers, and shows how the program works.
09:50:00 In this video, Sterling reveals that getstring has always returned a pointer, not a string. This can be confusing because getstring is a library function, and most people are used to thinking of it as returning a string. Sterling provides an example of how to fix this mistake.
09:55:00 In this video, Harvard CS50 instructor Michael S. Hart discusses how pointers in computer memory work. He also explains how to compare two strings using the equal operator.
This video demonstrates how to use various functions in the standard library to code for input and output. It also covers how to write files.
10:00:00 In this video, the Harvard CS50 computer science course instructor explains how to solve a problem in code where two variables represent the same address. The solution is to use a function called "stir copy", which copies the pointer from one variable to another.
10:05:00 The video discusses how to solve a problem involving an implicitly declared library function, and how to improve the code by avoiding the use of free(), and instead using the cs50 library's free() function.
10:10:00 The video discusses how Harvard's CS50 course teaches students how to use the functions malloc and free. It explains that, if these functions are not called in concert, malloc will fail and return a special value, n-u-l-l, which means something went wrong. The video then discusses an example of how this would have been used in the previous version of the program.
10:15:00 The video demonstrates how to use the malloc function to allocate memory, and then how to use the stir copy function to copy strings. The author also provides an example program that has memory related errors.
10:20:00 The video discusses Harvard's CS50 course, which is a full university course in computer science. The course emphasizes the use of proper syntax and semantics, as well as memory-related bugs. The author demonstrates an example of a logical bug and how to find it using a software tool called valgrind.
10:25:00 This video explains how garbage values are created and how to avoid mistakes that can lead to computer crashes.
10:30:00 In this video, Stanford CS50 instructor Nick Parlante walks through some of the code from his course, Harvard CS50. The code contains a function to swap two values in an array. Marina, one of the students in the class, is trying to figure out how to do it. Parlante explains that the code is more complicated than it needs to be, and Marina is able to figure it out after some trial and error.
10:35:00 The video demonstrates how temporary memory variables can be useful in computer programming, and how swap functions can be implemented in code. Unfortunately, the code does not work as intended, and it is explained why. Mariana's logic is correct but the use of one function versus another in computer programming can create a problem.
10:40:00 The stack is a collection of memory trays that grows in size as functions are called. When a function returns, the stack "forgets" about the data it was holding and instead leaves garbage values in its place. This can lead to strange behaviors in programs, as in the case of the buggy code example.
10:45:00 This video explains how to solve a problem in computer science using pointers. The problem is solved by using a temporary variable to store the original values of X and Y, and then copying those values into their respective locations.
10:50:00 The video discusses how to input user input in code using the printf and scanf functions, and how to prevent potential problems. It also shows how to make a program that tries to trigger a segmentation fault, an error that can occur when the code tries to access areas of memory it is not supposed to.
10:55:00 The video demonstrates how to use various functions in the standard library to code for input and output. It also covers how to write files.
The Harvard CS50 course is a comprehensive computer science course that covers fundamental concepts and teaches practical programming skills. In this video, various instructors walk viewers through different aspects of the course, such as how to use arrays and pointers, how to allocate memory, and how to typedef complex concepts.
11:00:00 This video introduces Harvard's "CS50" computer science course, which covers fundamental concepts in computer science. In week five, the course transitions to Python. Next week, the course will be simplified to a language called Python.
11:05:00 In this video, Harvard's CS50 computer science course is explained, focusing on how to solve problems with arrays in memory. The class covers how to reuse garbage values, and how to solve problems of specific interest to the user. The downside of this solution is that it can be time consuming and require effort to copy data.
11:10:00 This video discusses the Big O notation for algorithm running times and how it can be applied to memory management. The video also discusses how to use the Omega notation for more detail.
11:15:00 In this video, Harvard CS50 instructor Bill Cassel demonstrates how to allocate memory on the heap using malloc and free. When writing large programs, it is important to be aware of how memory is allocated, so that errors do not arise.
11:20:00 The video explains how to copy memory from one array to another, fix a bug, and free the memory.
11:25:00 The video discusses how Harvard's CS50 course uses dynamic memory allocation to solve the problem of large arrays. It shows an example of how to resize an array using the standard library function realloc, and then shows how to free the memory allocated for the old array.
11:30:00 In this video, Harvard's CS50 course explains how to use structures and pointers in C to efficiently store data. Structures can be used to encapsulate multiple pieces of data, and pointers can be used to navigate to the location of a structure in memory.
11:35:00 The Harvard CS50 course introduces students to the basics of computer programming, including the use of arrays and pointers. This video demonstrates how to create a linked list in memory, using more memory than an array would use.
11:40:00 In this video, Harvard CS50 instructor Michael S. Hart discusses how to represent data structures in code using the node keyword. The code examples show how to create a node for representing a student, a candidate, and a number. The node is represented by a struct, which has a number and a pointer field. When the compiler encounters the struct, it knows to look for the number and pointer fields.
11:45:00 In this video, Harvard CS50 instructor David Malan explains how to create and initialize a linked list in memory. In particular, he discusses the concept of node star and explains how to use malloc to allocate space for nodes. He also discusses how to add nodes to a list and how to check if a list is empty.
11:50:00 In this video, Harvard CS50 instructor Michael S. Tsirkin walks viewers through the process of creating a linked list using a primitive pointer. This process is made more manageable by using shorthand code, and the final result is a linked list that points to the number one.
11:55:00 In this video, Harvard CS50 instructor David Blumberg explains how typedef can be used to create a word that is more succinctly represent a complex concept, such as a node in a computer memory. He then goes on to explain how the code created by typedef can be translated into actual machine code, and how to prevent memory overflow when adding numbers to a list.
This video discusses the Harvard CS50 computer science course. The instructor explains how to write code to print out a list of numbers, and how to use a for loop to access specific memory locations without requiring the programmer to explicitly refer to them. The video also demonstrates how to use a hash table to store data in a specific, organized way.
12:00:00 In this video, Harvard CS50 instructor David Mark describes how to write code to print out a list of numbers. He uses a for loop to initialize a temporary variable and then prints out each number in the list. The for loop uses pointers to access the individual numbers in the list, which can be confusing.
12:05:00 In this video, Harvard CS50 instructor David Voss explains the for loop. This loop allows for repeated execution of a certain block of code, as long as the conditions specified at the beginning of the loop remain true. The for loop is different from the other two loops in that it uses a node star pointer (instead of an int star pointer), which the compiler understands. This allows the for loop to access specific memory locations without requiring the programmer to explicitly refer to them.
12:10:00 In this video, Harvard CS50 instructor Sebastian Thrun demonstrates how to use basic syntax in a while loop to free a list of nodes. In problem set five, students will be introduced to more explicit addressing in Python and how to abstract complex code away.
12:15:00 In this video, Pedro demonstrates how the order of operations affects how code works. He points to Lauren, then to Caleb, and finally to Hannah. In order to keep the list sorted, Lauren points at Caleb, then at Hannah, and finally at Pedro.
12:20:00 In this video, Harvard's CS50 course instructor discusses how a computer sees the world, explaining how linked lists work and why they are O(N) rather than O(n). He also mentions that binary search is no longer possible when working with arrays, but is still possible when working with linked lists. The instructor encourages students to think about algorithms in a more abstract way, rather than just relying on the code they've written.
12:25:00 The video discusses Harvard's CS50 computer science course, which contains a full course on computer memory and data structures. The video points out that, although binary search trees are a powerful tool, they can be improved by stipulating that nodes are no longer just numbers but also pointers to data structures.
12:30:00 In this video, Harvard's CS50 computer science course is described. The course covers the basics of computer science, including a discussion of binary search trees. The video goes on to show how to implement a binary search tree in code, and how to print the tree in order. Finally, the video discusses how complexity and developer time are often traded off in binary search trees.
12:35:00 In this video, Harvard CS50 professor Charles Severance teaches how to implement a binary search tree. He shows how to use recursion to store data in a tree, and how to print the tree using a function. Finally, he discusses why it is important to free memory before freeing other objects.
12:40:00 This 1-paragraph summary explains the concept of recursion and binary search trees, and how they work in conjunction with each other. Binary search trees are trees where the root is greater than its left child and smaller than its right child. Recursion is the process of repeating a task or function a certain number of times.
12:45:00 The video describes the binary search tree data structure, which is an efficient way to store data. The video also discusses how to use a hash table, which is a data structure that is similar to a binary search tree.
12:50:00 The video discusses how a hash table can be used to store data in a specific, organized way. It explains that the hash table consists of nodes that each point to another node, and that the number of buckets can be set by the user. It also shows an example of how a hash table would be used to store data for a story.
12:55:00 The video demonstrates how to hash a deck of cards, increasing the number of buckets by one for each letter of the alphabet. This process is repeated for words and phrases. The video also explains how a hash table is theoretically faster than a single linked list, asymptotically. However, in practice a hash table will be faster than a single linked list, because it will contain more collisions.
This video reviews the Harvard CS50 computer science course, which covers topics such as programming, data structures, and algorithms. The video demonstrates how to write a simple program to blur an image using a library, and compares the speed and functionality of Python and C. Python is found to be faster to write, but C may be better for more complex programs.
13:00:00 A try is a data structure that is designed to be faster than a linked list, and can store massive amounts of data.
13:05:00 Tries are not actually used that often in computer science, but are an important part of abstract data structures. They allow for constant time lookups, which is amazing.
13:10:00 This video discusses the concept of abstract data structures, specifically the lifo and fifo data structures. It explains how these structures can be implemented in computer programs, and provides an example of a real-world scenario in which these structures can become problematic.
13:15:00 In this video, CS50 instructor Michael Kennedy discusses how the language used in this course, Python, has simplified syntax compared to C. He also covers how to write code in Python, and how to use the command line to create programs.
13:20:00 In this video, we learn about the differences between printing in Python and in C. We also see how to increment a Python variable using the copy operator. Finally, we see how a Python format string works.
13:25:00 In this video, Harvard's CS50 course is compared to Python. The two languages have different syntax when it comes to conditionals, with Python favoring less-used keywords like "L if x greater than y." Additionally, Python has stricter indentation requirements, and while true is always the same in Python, it can be written as "while true" in C.
13:30:00 In this video, Harvard CS50 instructor Wes McKinney explains the difference between C's string data type and Python's string data type. Python has a stir data type that does more than strings did for us automatically. In addition, the range function allows you to customize where it begins and how it increments.
13:35:00 In this video, Harvard's CS50 course is explained in detail. One of the main points is that Python is an interpreted language, which means that you don't have to go through the compilation step. Instead, you can just run the code right away. This makes it much easier to make changes to your code and test it.
13:40:00 The video explains how Python is easier to use than other languages, shortening the amount of code needed to write, and providing a vast library of functions to help with various tasks.
13:45:00 This video provides a brief overview of the Harvard CS50 computer science course, which covers topics such as computer programming, data structures, and algorithms. The video then demonstrates how to write a simple program to blur an image using a library.
13:50:00 In this video, Harvard's CS50 course is reviewed. The load function in Python is compared to the size function in C, and the malloc and free functions in Python are compared to malloc and free in C. The speller function in Python is compared to the speller function in C. The two programs are then compared based on their speed and functionality. Python is found to be faster to write, but C may be better for more complex programs.
13:55:00 Python is a popular language that is faster to run than equivalent code written in more traditional languages such as C. However, Python can also be compiled into byte code, which is an intermediate step that is less time-consuming to execute than recompiling the code entirely.
This video is a walkthrough of the "hello world" program in both Python and C. The instructor demonstrates how to get user input and how to modify the program to get the user's name. He also discusses how to comment in Python and how to use the print function to create a brick prompt.
14:00:00 In this video, a Harvard CS50 instructor walks through two versions of the "hello world" program, one in C and one in Python. The C version uses a function from the CS50 course's library, while the Python version omits this dependency and simply prints "hello world." The instructor then demonstrates how to modify the program to get the user's name and asks the user a question.
14:05:00 In this video, Harvard CS50 instructor David Sax explains why using input instead of get string in Python code works just fine. He also revisits other examples from week one.
14:10:00 This video explains how to use the Python and C languages to do string concatenation and division. In Python, int is a function that defaults to decimal numbers, and so a literal for INT with base 10 cannot be interpreted as a number. When an exception is raised, Python prints the error message to the user.
14:15:00 The video discusses Harvard's CS50 course, which is a full university course in computer science. The course covers many topics, including variables, conditional statements, loops, and arrays. One example is given of truncation in C, which can happen when dividing one number by another. In Python, this is handled by the division operator. Another example is given of how to comment in Python.
14:20:00 In this video, the author discusses how to determine if a number is even or odd in Python and C using the remainder operator. He also shows how to simplify the code by adding support for multiple "yes" or "no" responses.
14:25:00 In this video, Harvard CS50 instructor, Salman Khan, discusses the benefits of using Python for programming. He shows how to create a function to perform a specific task, and discusses how to improve the design of a program by using functions. Finally, he demonstrates how to create a short, code-free main() function.
14:30:00 The video discusses the differences between global and local variables in Python. It explains that global variables are available to the entire program, while local variables are only available within the function in which they are defined. The video then demonstrates how to create a function that takes no arguments and prints "meow" three times.
14:35:00 Python has a do while loop, while true, and for loop, which makes it easier to recreate the idea of a loop in the language.
14:40:00 In Python, a "do while loop" behaves similarly to a "do while" loop in traditional programming languages like C. The difference is that in Python, a "do while loop" will always exit eventually if the condition is met, even if the loop is run multiple times. This feature can be used to handle exceptions in a more Python-friendly way.
14:45:00 In this video, Harvard CS50 instructor David Tang explains how to use the print function in Python to create a brick prompt. When printing multiple lines, Python takes into account the line ending specified as either a backslash (\) or nothing ( ). If the line ending is not specified, Python uses the default new line character. However, this can be overridden by specifying the new line character as quote unquote (').
14:50:00 In this video, Harvard University's CS50 computer science course is explained. The course covers basic programming concepts in Python. The video also features several examples of how to code solutions to problems.
14:55:00 In this video, Harvard CS50 professor Justin Cooke explains how to convert a string to lowercase. He also provides an example of how to do the same in Python.
Harvard's CS50 is a comprehensive computer science course that covers basic concepts and data structures, as well as more advanced topics like algorithms and code manipulation. In this particular video, the focus is on how to use Python to generate a QR code.
15:00:00 In this video, Harvard CS50 instructor David Sax introduces the concept of a method and demonstrates how it works in Python. He then goes on to show how to create a simple program that uppercases a string.
15:05:00 This video explains how to write code in curly braces in Python. Python has a different syntax for code inside curly braces than in plain English. You can slice a list in Python in a similar way to how you would slice an array in C. Finally, the video shows an example of how to use the exit() function.
15:10:00 This video explains how to solve a problem in Python where a command line argument is missing. The solution is to import functions from the sys module, and to use the sys.exit() function to exit the program with a specific code.
15:15:00 In this video, the author demonstrates how to access a person's phone number from a Python program using dictionaries. He also explains how to fix a bug in the program that caused it to fail.
15:20:00 This video covers Harvard's CS50 course, which is a full computer science university course. The course introduces the concepts of computer programming. In this particular example, the user is asked to create a phone book that stores contact information.
15:25:00 The video explains how Harvard's CS50 course works, and how the students are inputting answers to a question about their house preferences. The raw data from the form is saved in a Google spreadsheet, and a program is created to process the data. The program prints out the results for each house, and the video finishes by showing how to print out the results as an "F" string.
15:30:00 The video explains Harvard's CS50 course, which is a full university course in computer science. It covers basic concepts of computer science, including data structures and algorithms. The course also includes a project in which students are required to analyze and manipulate data. Python is used in the video to illustrate the different manipulation and analysis abilities of the language.
15:35:00 In this video, Harvard's CS50 university course, the author discusses how to generate a QR code from an image. First, they import a library for QR codes and then write code to generate the QR code.
15:40:00 In this video, Harvard CS50 instructor Valerie introduces Python, a programming language that is easier to use than C. She demonstrates how to read in CSVs from disk, store data in files, and export data to a Google spreadsheet. Next, she introduces Google Forms, a tool that allows users to collect data from other users.
15:45:00 CS50 students explore the utility of CSV files by exploring how they can be used for data storage and manipulation. CSV files are portable and easy to read, making them a convenient choice for flat file databases.
15:50:00 The video discusses how to filter out duplicate values in a CSV file.
15:55:00 The video discusses how to improve the design of a Python program by restructuring it into a set of values instead of a list, and by sorting the data by title.
This video introduces the Harvard CS50 computer science course and demonstrates how to use the cs50 library to import a CSV file into a SQL Lite database. The video then goes on to show how to use the library's SQL function to iterate over the data in the CSV file and print the results.
16:00:00 This video introduces the Harvard CS50 computer science course and demonstrates how difficult it can be to keep track of data when it is entered in a list or set form. The video then goes on to discuss how to keep track of data using a dictionary.
16:05:00 The video teaches how to use the sorted function in Python to sort a dictionary by key.
16:10:00 The get value function in Python allows you to pass in a function to be used to determine the value of a given title. This function is useful for eliminating repetitive code in your programs.
16:15:00 In this video, Harvard CS50 instructor David Malan describes how to use regular expressions to clean up data in a Google form.
16:20:00 The video discusses how to validate user input in a machine-readable way with regular expressions. It also discusses how to find the number of people who like the office, using a similar approach.
16:25:00 This video presents Harvard's CS50 course, which is more sophisticated than others and can be used for more general purposes. It covers various data manipulations with Python.
16:30:00 In this video, Harvard CS50 teaches the basics of SQL, a language used for databases. This language is easy to learn and use, and can be used to create, read, update, and delete data in a relational database.
16:35:00 This 1-paragraph summary explains how to select data from a database using the SELECT command.
16:40:00 This video covers the basics of SQL, a popular database language. SQL allows for complex data manipulation, including pattern matching and bulk updates.
16:45:00 In this video, Harvard CS50 instructor David Kennedy covers the basics of SQL. He covers how to create, read, update, and delete data in the database.
16:50:00 The video shows how to load CSV data into two tables so that the data is separated into genres and shows, which is more manageable.
16:55:00 This 1-paragraph summary introduces a YouTube video called "Harvard CS50 – Full Computer Science University Course" which shows how to use the Harvard cs50 library to import a CSV file into a SQL Lite database. The video then goes on to show how to use the library's SQL function to iterate over the data in the CSV file and print the results.
This video introduces the idea of SQL injection attacks, and how an attacker could exploit a vulnerability in a website's SQL database to log in as the owner. The video also provides an example of how to prevent SQL injection attacks.
17:00:00 In this video, Harvard CS50 instructor Michael Nielsen demonstrates how to better design a table of data by separating show IDs by commas and then associating genres with titles. This approach is more efficient and cleaner than the original Google spreadsheet, which had data separated by commas and stars. Nielsen also demonstrates how to search the data more accurately using SQL.
17:05:00 In this video, Harvard CS50 instructor David Smith explains how to sort data in SQL using the order by clause. Then, he demonstrates how to do the same thing using a subquery. Next, he shows how to import data into a new table and how to update data using the update command. Finally, he demonstrates how to flag a title as a comedy using the where clause in SQL.
17:10:00 In this video, Harvard CS50 instructor David Goldberg demonstrates how to use the SQL function in Python to access data from a database. He shows how to write a program that searches for a title in a favorites database.
17:15:00 This video explains how to use SQL to work with a data set from an internet database.
17:20:00 The video demonstrates how to access and query data in an IMDb database. The video shows how to create a table and add columns, and how to create a primary key.
17:25:00 In this video, Harvard CS50 instructor Patrick Nystrom demonstrates how to use indexes to speed up searches in a relational database. Indexes can improve the performance of searches by reducing the number of rows that need to be examined.
17:30:00 This video teaches viewers how to join two tables together using a join table. This is done by using a common ID in the tables, which then allows for easier navigation of the data.
17:35:00 This YouTube video demonstrates how to join tables in SQL, and illustrates how to speed up a query by creating indexes in memory.
17:40:00 The video introduces the concept of SQL injection attacks, and shows how an attacker could exploit a vulnerability in a website's SQL database to log in as the owner. The video also provides an example of how to prevent SQL injection attacks.
17:45:00 This 1-paragraph summary explains how a user can be logged in without entering their password by injecting single quotes into their username field.
17:50:00 The video shows Harvard CS50, a full computer science university course. The course covers various aspects of databases and programming. One problem that can occur is when two users try to access the same data at the same time. This can lead to race conditions, which can be difficult to solve.
17:55:00 The video discusses the concept of atomic operations, which are code blocks that run together or not at all depending on the circumstances. The video also describes how this can be problematic in real-world scenarios, such as when social media platforms go down.
This video introduces the basics of HTML and explains how to create a basic HTML file. It also discusses how browsers display web pages and how to create headings in an HTML document.
18:00:00 This video explains how the internet works and how Harvard's CS50 course builds on previous lessons by introducing web programming with HTML, CSS, and JavaScript. Next week, the course will introduce Python and SQL.
18:05:00 The video describes the origin and purpose of the internet, and how it has evolved over time. It then goes on to describe the protocols used to transmit data across the internet.
18:10:00 This video introduces the TCP and IP protocols, which are used to manage communication between computers. TCP allows for specific services to be identified and assigned a numeric identifier, while IP addresses represent a computer's location on the internet. The video then goes on to discuss the growing number of devices that require communication, and how TCP and IP handle large messages.
18:15:00 This video explains how TCP and DNS work together to ensure that data is delivered reliably. TCP ensures that packets are sent in the correct order, and DNS allows computers to find each other's addresses.
18:20:00 Domain names, IP addresses, and URLs are all components of the internet. Domain names are translated to IP addresses, and URLs point to files or other URLs on the internet. URLs can also include path information, which tells a browser what file or folder to look for on the web server. Today, URLs usually use HTTPS, which makes them more secure.
18:25:00 The video discusses the basics of computer science, including the concept of a fully qualified domain name (FQDN). The video explains how a request for a webpage is made, and how the response is sent. It also discusses the different types of content that can be sent back in a response.
18:30:00 In this video, Harvard CS50 instructor Ed Harvard demonstrates how a browser sends HTTP headers when visiting a website, and how one can use developer tools to view the headers for a specific website. He also explains how a 301 response (Moved Permanently) indicates that the website's address has been permanently changed.
18:35:00 This video demonstrates how to visit a website that doesn't exist, by simulating a GET request to a URL that doesn't exist. 404 Not Found is the status code returned when the requested URL doesn't exist.
18:40:00 In this video, Yale students prank Harvard by sending them a three-minute retrospective of old Yale videos. The quality of the video is representative of the era in which it was made. The video discusses what is deeper down inside an envelope, and introduces HTML and CSS. In week nine, Python and SQL will be reintroduced, tying everything together.
18:45:00 In this video, Harvard CS50 instructor David Sax explains the basics of HTML, which is the foundation for all webpages. He shows how to create a basic HTML file, with an open and close bracket, followed by a start and end tag. Sax also explains the language of the page, which is written in English.
18:50:00 This 1-minute video introduces the basics of HTML and explains how browsers display web pages. The video also discusses how to create a basic HTML file.
18:55:00 The video demonstrates how to create headings in an HTML document.
The video covers the basics of HTML and CSS, as well as table layout. It introduces the standardization of HTML, CSS, and JavaScript, and explains that these standards solve problems like ensuring that all pages have a dynamic content that changes well.
19:00:00 In this video, Harvard's CS50 computer science course is explained. The course covers the basics of HTML and CSS, as well as table layout.
19:05:00 In this video, Harvard CS50 instructor David Evans discusses the use of style sheets to make web pages look more polished and professional. He then shows how to create an image file and a video file, and explains the various attributes of the video tag.
19:10:00 This video demonstrates how to embed a Harvard CS50 lecture video into a web page, and how to create relative links to other web pages.
19:15:00 This video explains how to make a website more responsive to different devices, using HTML tags and Chrome's "developer tools."
19:20:00 The video introduces the standardization of HTML, CSS, and JavaScript, and explains that these standards solve problems like ensuring that all pages have a dynamic content that changes well. It then introduces a new format for URLs, which is slash path question mark key equals value. The video concludes by discussing how using this form would send the user's request to Google's search path.
19:25:00 In this video, John Harvard demonstrates how to stylize a web page using CSS and JavaScript. First, he introduces the concept of semantic tags, which are used to describe the structure of a web page. Next, he demonstrates how to create a style attribute and add a font size and alignment. Finally, he demonstrates how to add a style attribute to the footer.
19:30:00 In this video, Harvard CS50 instructor Michael Nielsen introduces the concept of key value pairs and shows how they are implemented in different languages, as well as in CSS. He then goes on to explain how to create similar key value pairs in CSS, without having to edit the same lines of code as each other.
19:35:00 In this video, the author shares how to create a better design for a website using CSS. They discuss how to use classes to create different styles for different parts of the page, and how to create a style sheet to reuse the styles.
19:40:00 In this video, the instructor demonstrates how to use HTML and CSS to style text. He shows how to change the color of one paragraph in a file using color codes and shows how to use developer tools to see the source code of a web page.
19:45:00 In this video, Harvard CS50 instructor David Heinemeier Hansson demonstrates how to stylize links on a website using CSS. He also demonstrates how to inspect and change style properties on a webpage.
19:50:00 In this video, Harvard CS50 instructor David Mark describes the various CSS properties available to style elements on a website. He also demonstrates how to use a CSS framework, Bootstrap, to create a simple alert message.
19:55:00 Bootstrap is a free, open source framework that allows you to create more user-friendly websites than you might otherwise be able to make on your own. Adding the bootstrap table class to your table tag will allow you to use its classes to improve the look of your search.html file.
This video provides a brief introduction to Harvard's CS50 computer science course. The instructor covers how to create two templates, one for index.html and one for greet.html, which are essentially duplicates of one another. The instructor notes that this approach can become tedious very quickly if you need to make changes to many templates.
20:00:00 The video discusses how to make a web page fluid and how to indent multiple lines of code in VS Code. The instructor also discusses how to create an unordered list and a nav link with text dark.
20:05:00 This YouTube video covers the basics of JavaScript syntax and how it works in the browser. The video covers how to create variables, write conditional statements, and do Forever loops.
20:10:00 As stated in the video, the Gmail "automatically appears every few seconds" or "minutes" and "works when you visit gmail.com." Gmail also "uses their code to add another element another element another element to the existing Dom document object model." In order to greet the user, the author adds an attribute to the form element, submits the form, and returns false when the user tries to submit the form.
20:15:00 In this video, Harvard CS50 instructor David Mosca discusses the use of concatenation in Python and how to do it in JavaScript. He also demonstrates how to add an event listener for the submit event, and how to call a function named greet.
20:20:00 In this video, CS50 student David Manoukh explains how to programmatically change the background color of a web page to different colors using CSS and JavaScript. He also demonstrates how to use autocomplete functionality in a web page to search for words.
20:25:00 In this video, the instructor introduces a Python-based web server that can be used to process user input. This web server is called a "framework."
20:30:00 In this video, Harvard CS50 instructor Michael Kennedy teaches how to create a simple Flask web application. He first defines a route for "/" and a function called "index", and then creates a file called "index.html". Finally, he tells Flask to call "index" whenever it receives a request for "/".
20:35:00 In this video, the speaker explains how to start a web server using Flask and how to use variables in templates. He also demonstrates how to use a template to display the input from a URL.
20:40:00 This video covers the basics of how to create a web page that includes code, but also includes placeholders for user input. The user is then shown how to replace the name placeholder with their own name, so that the page will greet them by name.
20:45:00 In this video, Harvard CS50 instructor David Deutsch demonstrates how to create a form, populate it with user input, and submit it to a second route. When the user tries to submit the form, they are given a 500 error.
20:50:00 The video discusses how to identify and solve an internal server error in code. In particular, the video explains how to use a terminal window to diagnose and fix the error.
20:55:00 This video provides an introduction to Harvard's CS50 computer science course. The instructor shows how to create two templates, one for index.html and one for greet.html, which are essentially duplicates of one another. The instructor notes that this approach can become tedious very quickly if you need to make changes to many templates.
The video covers the basics of web development using the Flask framework. It covers how to create templates, how to inject logic into templates, and how to use GET and POST requests. It also covers how to debug errors in a form, and how to use a database to store data for a web application.
21:00:00 The video discusses the design and architecture of a basic Flask web application. It covers how templates are used to create a uniform look for different pages, and how logic is injected into the templates to handle requests. It also discusses privacy implications of the design and how users may not be happy with it.
21:05:00 The author discusses the difference between GET and POST requests, and how GET requests expose user data in the URL while POST requests do not. He provides an example of how GET requests work, and how POST requests can be used to send data to a server without exposing it in the URL. He also discusses the issue of using GET requests without properly defining routes, and how this can lead to issues such as not being able to use GET requests to retrieve information from a form.
21:10:00 In this video, Harvard's CS50 course is introduced. The course covers topics such as the different roles that a function may have, depending on what functionality is desired, and how sensitive its implementation might be. All right, any questions? Then on to our first web application. Super simple. Just get someone's name and print it out. But we now have all the plumbing to create anything we want. No questions? Let's go ahead and take a five minute break and when we come back, we'll add to this some first year intramural sports. All right, we're back. Recall that the last thing we changed was the route to use post instead of get. So Gone is my name and any value in the URL. But there was kind of a subtle bug or change here that we didn't call out earlier. I typed David into the form and clicked submit. You hear it say hello, comma world. So that seems to be broken all of a sudden. Even though we added support for post, something must be wrong logically. It must be the case here intuitively that if I'm seeing hello world, that's the default value I gave the name variable. It must be that it's not seeing a key called name in request
21:15:00 In this video, Harvard CS50 instructor Dan Meyer shows how to create a web application in 1997 using HTML, Pearl, and JavaScript. He discusses the basics of web programming, including background images that repeat infinitely.
21:20:00 The video describes the full computer science university course at Harvard, which includes courses in basketball, soccer, and Ultimate Frisbee. The video shows how to create routes for registering for sports, and how to error-check user input. Finally, the video shows how to render a template indicating success or failure in registering.
21:25:00 The video demonstrates how to debug issues in a form by looking at the HTML code and the request.form object. The video also covers the importance of assigning a name to input fields, and how this can prevent errors from being sent to the server.
21:30:00 The video introduces Harvard's CS50 course, which is a full university course in computer science. The course covers topics such as programming, data structures, algorithms, and web development. One major issue the presenter ran into was that the browser was not sending his form data. After looking into Chrome's developer tools, he found that the form data was being submitted via a form's URL. He then changed the form's user interface to use checkboxes instead of a dropdown menu.
21:35:00 In this video, Harvard CS50 instructor Wes Bos provides a brief overview of how to create a website that allows users to sign up for multiple sports. Wes demonstrates how to use templates and Jinja in order to create a form that is easy to use and customize.
21:40:00 The video demonstrates how to handle errors when registering for sports at Harvard's CS50 university course. The first step is to get the user's name, and if it does not match any of the sports in a global variable, an error is displayed. If the user types in a sport that is not in the global variable, an error is displayed with a different message.
21:45:00 In this video, Harvard CS50 instructor David Segal demonstrates how to create and use a database to store data for a web application. He shows how to create a route for registering for sports, and how to execute SQL queries using the CS50s SQL library. Finally, he shows how to use the redirect function to redirect users from one page to another.
21:50:00 This video explains how to use the CS50 library to render a registrants.html table that contains users' names and sports, and how to deregister users using form and URL logic.
21:55:00 This video demonstrates how to trick Emma into deregistering herself from a website she is logged into. The video also shows how to use the Flask mail library to send emails to the Proctor in charge of the intramural sports program.
This video is a tutorial on how to draw a cube with a point on top. Harvard CS50 instructor Carter Piffer walks through the first six steps of the exercise, starting with drawing a circle and then aligning the lines so that they intersect at the top.
22:00:00 This video covers Harvard's CS50 course, which covers key value pairs in the computer's memory, running a certain command but that never show up in your actual code, otherwise there would be so many usernames and passwords accidentally visible on the internet. John Harvard installed a pre-written script to check if he registered for a class, and it worked as a demonstration.
22:05:00 Cookies are small pieces of information that a website stores on a user's computer in order to keep track of that user and remember what they have done on the website. When a user logs into a website, the website sets a cookie on the user's computer. The cookie contains a session ID, which the user can use to return to the website later without having to log in again. Cookies can also be used to track a user's browsing habits and serve them more relevant ads.
22:10:00 The video demonstrates how to use sessions in an application, and shows how the session information is remembered across multiple visits to the same URL.
22:15:00 In this video, Harvard CS50 instructor Michael Kennedy demonstrates how sessions work in Flask and how they can be used to store user data. He also demonstrates how sessions can be used to create e-commerce sites.
22:20:00 This YouTube video demonstrates how to use the get and post functions in the same route, in order to distinguish between GET and POST requests. This is useful for keeping URLs concise and canonical.
22:25:00 In this video, Harvard's CS50 course is discussed, including examples of how various languages work together. The goal of the examples is not to teach how to write the code in these languages, but rather to give a mental model for how these languages work. The final example shows how autocomplete works in a web application.
22:30:00 This YouTube video walks viewers through the basics of using the Google Maps and Gmail APIs, and demonstrates the difference between sending data in a format called "Json" and using the older, less efficient "Li tags." The video concludes by showing how to use the same code to create a user interface for a simple quiz.
22:35:00 In this video, Harvard CS50 instructor David Blatner discusses the syntax of JavaScript, which is both human-friendly and machine-friendly. He demonstrates how this syntax is used to create larger and larger strings of HTML, containing all of the Open and close brackets, along with the LI tags and the close brackets, but just grabbing the data from the server. Next, he shows how this syntax is used in a real world situation, to create a third-party API application programming interface which returns data in JSON format. Finally, he demonstrates how this syntax can be used to create dynamic and interactive web pages.
22:40:00 This video introduces CS50, a 10-week course that concludes with a final project. CS50 is designed for students who want to learn computer science fundamentals. The video features footage of teaching fellows attempting to transfer data between two computers. Some of the footage was not perfect and was cut from the final product.
22:45:00 This video introduces the Harvard CS50 course, which is designed to help students develop computational thinking and critical thinking skills. The course focuses on teaching the basics of computer programming, with a particular emphasis on correctness, design, and readability. While the course is progressing, students are also expected to complete a number of projects and tests.
22:50:00 Claire is giving step-by-step instructions on how to draw something on a sheet of paper. She says that it should look like a cube, but with a point on top. The audience is to follow her instructions precisely.
22:55:00 In this video, Harvard CS50 instructor Carter Piffer walks through the first six steps of a Drawing cube exercise. The first three steps involve drawing a circle, and the next three steps involve aligning the line down from the bottom to the left so that it intersects the circle at the top.
The video discusses the Harvard CS50 computer science course, which is a full university course covering all aspects of computer science. The students interviewed discuss the role of a compiler, the search efficiency of a balanced binary search tree, and the costumes of Harvard's CS50 Ducks Halloween party.
23:00:00 This video shows how to do the final steps in a CS50 class, which include drawing a line from the end of the line you just drew to the circle, and making Jonathan say hi.
23:05:00 The video explains the basics of CSS, which is a style sheet language used for formatting and presentation of web pages. It also explains the importance of speed when doing CSS work, and provides a quiz to see how well you've understood the material.
23:10:00 This video discusses the Harvard CS50 computer science course, which is a full university course covering all aspects of computer science. The students interviewed discuss the role of a compiler, the search efficiency of a balanced binary search tree, and the costumes of Harvard's CS50 Ducks Halloween party.
23:15:00 This video introduces the Harvard CS50 computer science course, which covers the basics of computer programming. It covers the basics of boolean logic, integer arithmetic, and string handling. The video then goes on to discuss the differences between various data structures, and how to choose the right one for a particular situation. Finally, the video explains the HTTP status code "403 Forbidden."
23:20:00 In this YouTube video, Harvard's CS50 course is described. In 7280, a student is still leading the pack, and some questions remain unanswered. CS50 is a full computer science university course that covers topics such as arrays, strings, linked lists, and hashing.
23:25:00 Jennifer Lee, a classmate of the narrator's from Harvard's CS50 computer science course, discusses how emoji are created and how they've evolved over time. Lee discusses how she became involved in the design and development of emoji, and how her Chinese and Australian heritage influenced her designs.
23:30:00 The video discusses how the lack of a dumpling emoji on the Unicode Consortium's keyboard lead one individual to create a group called EmojiNation to push for its inclusion. The group successfully campaigned for the dumpling emoji to be added to the Unicode Consortium's keyboard, and as a result it is now available on most devices.
23:35:00 An emoji for poutine, a Canadian dish, was proposed and accepted by the Unicode Technical Committee. Other factors considered include popular demand, visual distinctiveness, and whether or not it is already something that is commonly used.
23:40:00 Harvard's CS50 class covers the full Unicode set of emoji, which can be quite confusing for newcomers. EmojiNation has been working on a variety of emoji, and one of the more recent proposals was accepted by Unicode and added to devices over the past few weeks.
23:45:00 Emoji are symbols that can be used to convey different emotions or ideas in text or visual communication. The author provides a brief history of emoji and discusses how they are similar to Chinese radicals and characters from long ago. He also discusses how emoji can be used to represent different aspects of society. Finally, the author provides an example of how emoji can be used in Chinese text.
23:50:00 The video discusses the various meanings of Chinese character "woman," including under a roof, family, and mother. It also discusses the various gender incarnations of emoji, including male and female versions of emoji that were created in response to complaints about gender discrimination in emoji. Finally, the video discusses the creation of skin tone modifiers for emoji, which helps to represent people of different races and ethnicities.
23:55:00 The new emoji include more heart symbols, a blackbird and goose, and a Ginger and Peapod. The video also discusses the controversy around the inclusion of certain symbols, and how Wireless was included as a symbol for Wi-Fi.
This video introduces CS50, a full university course in computer science, and covers the basics of programming and computational thinking. The course introduces students to the intellectual enterprises of computer science, including computational thinking, and teaches them the basics of programming. Along the way, students are equipped with the basics, such as knowing how to speak computer code, needed to access and use computers.
00:00:00 This video introduces CS50, a full university course in computer science, and covers the basics of programming and computational thinking. The course introduces students to the intellectual enterprises of computer science, including computational thinking, and teaches them the basics of programming. Along the way, students are equipped with the basics, such as knowing how to speak computer code, needed to access and use computers.
00:05:00 Today's lesson is about passwords, and how they can be secure. According to the results of a recent study, 36% of people don't use passwords that are strong enough, and 31-32% of people think their phone's password is secure. However, passwords are only as secure as the weakest link in the security chain, and if someone knows your password, they can access your account. Additionally, today's lesson discusses ways to be more secure when using online services, such as passwords, and how to protect your devices against cyber-attacks.
00:10:00 The most common password according to one measure was one two three four five six. The number two password was not much better. Number three was picture one presumably for a device a website that requires that it not just be a word to have at least one number which this person took these hundreds of thousands of people took literally. The password was number four this past year. One two three four five six seven eight one one one one one one one was number one, one two three one two three varying it a little bit was number eight, one two three four five six seven eight nine zero was number nine, and number ten in 2020 was senya.
00:15:00 In this video, CS50 instructor David Levy introduces the concept of "the search space," which refers to the number of possible passcodes that can be generated by a human or a machine. He then goes on to explain that, even with a six-digit passcode, an adversary can still attempt to brute-force the code if they have enough time and resources. Levy recommends that users create longer passcodes, as this will make brute-force attacks more difficult.
00:20:00 This video introduces CS50, a full university course in computer science. CS50 students are introduced to four letter passcodes, which can be used to protect passwords and other confidential information. The video then demonstrates how to create eight character passcodes using various combinations of digits, letters, and punctuation symbols. Finally, it shows that eight character passcodes are much more secure than ten thousand character passwords.
00:25:00 The video discusses the extreme lengths to which someone could go to try to guess a user's password, and the various defenses that are available. It also discusses how some users have already implemented these defenses on their phones.
00:30:00 This video discusses the trade-offs involved when raising the security standard for an adversary. It discusses how two-factor authentication (2FA) can help reduce the risk of unauthorized access to a user's account, while also protecting against other types of threats.
00:35:00 Password managers can help to improve security by generating unique passwords for each website, and by storing passwords in a secure location. However, there are downsides: if your device is lost or stolen, or if you forget your password, your accounts are at risk.
00:40:00 Computer science students learn about encryption and how to use it to protect their communications. They also learn about Caesar ciphers, which are used to encrypt messages.
00:45:00 Harvard's CS50 university course teaches how to substitute one letter for the next in a predictable way, which becomes b b becomes C, and so forth. This is useful for encrypting messages, but is not as secure as end-to-end encryption.
00:50:00 The video discusses how to protect your online accounts with two-factor authentication and encryption. It also mentions how to choose the best tool for you, depending on your comfort level.