CS50 Fall 2025 - Lecture 1 - C (live, unedited)

*** This is CS50, Harvard University's introduction to the intellectual enterprises of computer science and the art of programming. *** TABLE OF CONTENTS 00:17:45 - Introduction 00:19:22 - Source Code 00:22:03 - Visual Studio Code for CS50 00:26:02 - Hello, World 00:31:35 - From Scratch to C 00:41:12 - Header Files 00:44:12 - CS50 Manual Pages 00:48:03 - Hello, You 01:01:05 - Terminal Commands 01:13:02 - Conditionals 01:19:57 - Types 01:26:04 - compare.c 01:34:35 - agree.c 01:39:38 - Loops 01:44:44 - cat.c 02:18:46 - Functions 02:30:12 - Correctness, Design, Style 02:36:54 - Mario 02:46:51 - calculator.c 02:53:30 - Integer Overflow 02:56:18 - Boeing 02:58:41 - Pacman 03:00:21 - Truncation 03:00:41 - Type Casting 03:01:17 - Floating-Point Imprecision *** HOW TO SUBSCRIBE http://www.youtube.com/subscription_center?add_user=cs50tv 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.edu Discord: https://discord.gg/cs50 Ed: https://cs50.edx.org/ed Facebook Group: https://www.facebook.com/groups/cs50/ Faceboook Page: https://www.facebook.com/cs50/ GitHub: https://github.com/cs50 Gitter: https://gitter.im/cs50/x Instagram: https://instagram.com/cs50 LinkedIn Group: https://www.linkedin.com/groups/7437240/ LinkedIn Page: https://www.linkedin.com/school/cs50/ Medium: https://cs50.medium.com/ Quora: https://www.quora.com/topic/CS50 Reddit: https://www.reddit.com/r/cs50/ Slack: https://cs50.edx.org/slack Snapchat: https://www.snapchat.com/add/cs50 SoundCloud: https://soundcloud.com/cs50 Stack Exchange: https://cs50.stackexchange.com/ Telegram: https://t.me/cs50x Threads: https://www.threads.net/@cs50 TikTok: https://www.tiktok.com/@cs50 Twitter: https://twitter.com/cs50 Twitter Community: https://twitter.com/i/communities/1722308663522594923 YouTube: http://www.youtube.com/cs50 HOW TO FOLLOW DAVID J. MALAN Facebook: https://www.facebook.com/dmalan GitHub: https://github.com/dmalan Instagram: https://www.instagram.com/davidjmalan/ LinkedIn: https://www.linkedin.com/in/malan/ Quora: https://www.quora.com/profile/David-J-Malan Threads: https://www.threads.net/@davidjmalan TikTok: https://www.tiktok.com/@davidjmalan Twitter: https://twitter.com/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/by-nc-sa/4.0/ David J. Malan https://cs.harvard.edu/malan [email protected]