CS50x 2026 - Lecture 1 - C

*** This is CS50, Harvard University's introduction to the intellectual enterprises of computer science and the art of programming. *** TABLE OF CONTENTS 00:00:00 - Introduction 00:00:43 - Source Code 00:05:01 - Visual Studio Code for CS50 00:09:00 - Hello, World 00:14:33 - From Scratch to C 00:24:10 - Header Files 00:27:10 - CS50 Manual Pages 00:31:01 - Hello, You 00:44:03 - Terminal Commands 00:55:49 - Conditionals 01:02:55 - Types 01:09:02 - compare.c 01:17:33 - agree.c 01:22:24 - Loops 01:26:09 - cat.c 01:44:46 – Functions 01:56:21 – Correctness, Design, Style 02:02:48 – Mario 02:12:53 – calculator.c 02:18:32 – Integer Overflow 02:22:11 – Boeing 02:24:34 – Pacman 02:25:54 – Truncation 02:26:32 – Type Casting 02:26:47 – Floating-Point Imprecision *** HOW TO SUBSCRIBE http://www.youtube.com/subscription_c... HOW TO TAKE CS50 edX: https://cs50.edx.org/ Harvard Extension School: https://cs50.harvard.edu/extension Harvard Summer School: https://cs50.harvard.edu/summer OpenCourseWare: https://cs50.harvard.edu/x HOW TO JOIN CS50 COMMUNITIES Bluesky: https://bsky.app/profile/cs50.harvard... Discord:   / discord   Ed: https://cs50.edx.org/ed Facebook Group:   / cs50   Faceboook Page:   / cs50   GitHub: https://github.com/cs50 Gitter: https://gitter.im/cs50/x Instagram:   / cs50   LinkedIn Group:   / 7437240   LinkedIn Page:   / cs50   Medium:   / cs50   Quora: https://www.quora.com/topic/CS50 Reddit:   / cs50   Slack: https://cs50.edx.org/slack Snapchat:   / cs50   SoundCloud:   / cs50   Stack Exchange: https://cs50.stackexchange.com/ Telegram: https://t.me/cs50x Threads: https://www.threads.net/@cs50 TikTok:   / cs50   Twitter:   / cs50   Twitter Community:   / 1722308663522594923   YouTube:    / cs50   HOW TO FOLLOW DAVID J. MALAN Facebook:   / dmalan   GitHub: https://github.com/dmalan Instagram:   / davidjmalan   LinkedIn:   / malan   Quora: https://www.quora.com/profile/David-J... Threads: https://www.threads.net/@davidjmalan TikTok:   / davidjmalan   Twitter:   / davidjmalan   *** CS50 SHOP https://cs50.harvardshop.com/ *** LICENSE CC BY-NC-SA 4.0 Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International Public License https://creativecommons.org/licenses/... David J. Malan https://cs.harvard.edu/malan [email protected]