CS50 Fall 2023 - Lecture 1 - C (live, unedited)

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This is CS50, Harvard University's introduction to the intellectual enterprises of computer science and the art of programming.

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TABLE OF CONTENTS

00:00:00 - Introduction
00:12:59 - Machine Code
00:17:56 - Visual Studio Code for CS50
00:21:12 - Hello, World
00:30:38 - From Scratch to C
00:32:32 - CS50 Library
00:43:12 - Format Codes
00:48:21 - Hello, You
00:52:51 - Types
00:54:13 - Conditionals
01:00:37 - Variables
01:03:28 - compare.c
01:15:38 - agree.c
01:23:04 - Loops
01:29:10 - meow.c
01:39:04 - Functions
01:46:42 - Break
02:00:15 - calculator.c
02:05:48 - Scope
02:09:36 - Function Composition
02:12:04 - Linux
02:20:35 - Mario
02:35:32 - Integer Overflow
02:40:59 - Truncation
02:44:27 - Type Casting
02:45:51 - Floating-Point Imprecision
02:48:37 - Y2K
02:51:16 - Video Games
02:53:05 - Boeing

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HOW TO SUBSCRIBE

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HOW TO JOIN CS50 COMMUNITIES

HOW TO FOLLOW DAVID J. MALAN

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CS50 SHOP

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LICENSE

CC BY-NC-SA 4.0
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International Public License

David J. Malan

[Agranat]

Thank you, Prof. Malan, for bridging distances, breaking barriers, and making elite education accessible to all.

[franky_teck]

You can clearly see when a professor loves what he does, and professor Malan does it effortlessly

[maxprinceps]

A big thank you to David Malan for providing your teachings here on YouTube for free. This is helping me and lots of other students. You are a very nice person. Thank you ❤ 🙏

[cacheman]

Assertion to the contrary, the do-while program at 2:33:17 is not valid. Even _if_ 'n' was available at the conditional (which it is not), it would not be valid in the rest of the program because it was declared in a separate inner scope. In this example, the declaration of 'n' and the assignment to 'n' must be separated, with the declaration moving before the do-while.

This could be turned into a teachable moment by showing what happens if you add the declaration of 'n' before the do, while leaving it inside too. Shadowing can cause insidious issues.

[mertkaraman]

Imagine this guy is your professor!
What an amazing man.
Thanks for video.

[tatsinis]

Such a great professor, he looks so excited to teach programming.

[checkoverstripes]

you know, watching this early introduction to computer science, makes you feel how much you've grown

[krijankhatri]

"Time reveals the past, but knowledge shapes the future." *Knowledge is everywhere just go and grab it.*

[ahmedshaikh]

Thank you for your time and instruction.

[leocrypto]

The program at 2:33:00 doesn't work for me. I needed to change:

int n;
do
{
n = get_int("Size: ");
}
while (n < 1);


With the way explained in the video the "while" doesn't recognise the "int n" as it's inside the bracket ("SCOPE ISSUE")

[Rennie_genius]

literally CS50 is the best...no room for dispute!

[devilcodeblaster]

Thanks for providing an awesome lecture

[arifekaprasetya]

Clearly explanation... Thanks a lot Prof. Malan

[muhammadammar]

🤔🤔can you please tell me whats new in CS50 Fall 2023 vs. CS50x 2023 which was also uploaded on youtube

[ArjunCodess]

13:01 Today, we learn C and focus on problem-solving.

15:09 Learning about source code and machine code

19:12 The user interface consists of different regions.

21:01 Learn how to write, compile, and run code using three commands: apply code, make, and ./hello.

24:51 Print a formatted message in C using printf function.

26:48 Using backslash N (
) can ensure a new line at the end of the output

31:13 Printing in C requires including the stdio.h library

33:19 A library is code that someone else wrote and a header file (.h) gives you access to it.

37:10 Getting user input in C can be challenging

39:13 A return value is like a slip of paper with the answer to a function.

43:12 Using print F in C to format text

45:30 Understanding the syntax of string formatting in C

50:00 The VS code colors are automatically applied to text

52:01 Using the appropriate header file and including CS50_DOT_H teaches the compiler new functionality.

56:06 Code formatting rules should be standardized for consistency.

58:13 Using a single equal sign in C means assignment, while using double equal sign means equality.

1:02:17 Incrementing and decrementing variables in C

1:04:25 The program demonstrates the use of conditional statements

1:08:30 Using ELIF statements instead of nested IF statements can simplify code and save time.

1:10:31 Optimize code by reducing unnecessary questions

1:14:52 In C, there are three data types: strings, integers, and characters.

1:16:50 Checking user agreement can be done by comparing variables C with lower and uppercase characters.

1:21:11 Using vertical bars in C can be used to represent the English word 'or'

1:23:16 C programming involves understanding functions, conditionals, loops, and implementing ideas like repetition.

1:27:22 Using descriptive variable names is conventionally preferred in programming.

1:29:24 Using a loop to avoid code duplication

1:33:26 The four loop syntax is a more succinct way of achieving the same idea

1:35:38 Using curly braces in code is common, but not always necessary

1:39:56 Functions in C can be used to abstract away certain tasks

1:41:56 The order of defining functions in C is important

1:46:10 There's a lot of new syntax and translation of scratch to c.

2:01:48 Creating a simple calculator to add two numbers in C

2:06:05 Variable scope and function arguments in programming.

2:08:21 The function takes two inputs and returns the sum of them.

2:12:22 Linux is a popular operating system with a textual interface.

2:14:32 Learn to use keyboard commands to increase productivity

2:18:29 Deleting files using the RM command in Terminal.

2:20:34 Creating a program to print four question marks in a row.

2:24:45 Printing a grid using loops

2:26:47 The code shows how to print a grid using hash symbols in different sizes.

2:30:54 Using a loop to ensure the user enters a positive integer

2:32:52 Introduction to do-while loop and comments in C programming

2:37:10 Integer overflow is a limitation in computers due to insufficient memory

2:39:09 Data types in C allow control over the number of bits used.

2:43:22 Truncation in division causes incorrect results

2:45:30 The computer's rounding error and limitations in representing numbers lead to unexpected results

2:49:55 The 2038 problem is a potential issue with computers counting time that could cause problems in the year 2038.

2:51:52 Software bugs can cause unexpected problems in various systems.

Crafted by Merlin AI.

[rtzx]

Could you program the answer to include a confirmation a correct entry was made as a fourth option? for example 3rd output is "x is equal to y\n"; then 4th output is ("or the entry is not an integer\n ");

[Enigmaniacc]

Just asking for the sake of planning,
Would there be complete course lectures regularly? Or else.
Please inform!

[raginijenkins]

Prof. Malan is amazing but everytime when he makes the "#" he references its "underground" Mario but its the castle theme and as a Nintendo fan it urks me to no end lol

[El_Azam]

include <cs50.h> not working. "your.c:1:18: fatal error: cs50.h: No such file or directory
#include <cs50.h>" i'm getting this in the output.