CS50x 2025 - Lecture 1 - C

David J. Malan teaches the fundamentals of the C programming language, including syntax, variables, loops, and compilation.

*** C. Source Code. Machine Code. Compiler. Correctness, Design, Style. Visual Studio Code. Syntax Highlighting. Escape Sequences. Header Files. Libraries. Manual Pages. Types. Conditionals. Variables. Loops. Linux. Graphical User Interface (GUI). Command-Line Interface (CLI). Constants. Comments. Pseudocode. Operators. Integer Overflow. Floating-Point Imprecision. *** TABLE OF CONTENTS 00:00:00 - Introduction 00:01:15 - Source Code 00:04:59 - Visual Studio Code for CS50 00:08:34 - Hello, World 00:18:39 - From Scratch to C 00:25:42 - Header Files 00:29:10 - CS50 Manual Pages 00:32:18 - Hello, You 00:42:31 - Terminal Commands 00:51:06 - Types 00:52:24 - Conditionals 01:00:05 - Variables 01:02:50 - compare.c 01:16:34 - agree.c 01:23:26 - Loops 01:24:41 - cat.c 01:41:55 - Functions 01:56:36 - Correctness, Design, Style 01:58:33 - Mario 02:12:11 - calculator.c 02:20:04 - Integer Overflow 02:22:53 - Boeing 02:24:42 - Pacman 02:25:25 - Truncation 02:27:17 - Type Casting 02:30:10 - Floating-Point Imprecision *** This is CS50, Harvard University's introduction to the intellectual enterprises of computer science and the art of programming. *** HOW TO SUBSCRIBE youtube.com/subscription_center?add_user=cs50tv HOW TO TAKE CS50 edX: cs50.edx.org/ Harvard Extension School: cs50.harvard.edu/extension Harvard Summer School: cs50.harvard.edu/summer OpenCourseWare: cs50.harvard.edu/x HOW TO JOIN CS50 COMMUNITIES Discord: discord.gg/cs50 Ed: cs50.edx.org/ed Facebook Group: facebook.com/groups/cs50/ Faceboook Page: facebook.com/cs50/ GitHub: github.com/cs50 Gitter: gitter.im/cs50/x Instagram: instagram.com/cs50 LinkedIn Group: linkedin.com/groups/7437240/ LinkedIn Page: linkedin.com/school/cs50/ Medium: cs50.medium.com/ Quora: quora.com/topic/CS50 Reddit: reddit.com/r/cs50/ Slack: cs50.edx.org/slack Snapchat: snapchat.com/add/cs50 SoundCloud: soundcloud.com/cs50 Stack Exchange: cs50.stackexchange.com/ Telegram: t.me/cs50x Threads: threads.net/@cs50 TikTok: tiktok.com/@cs50 Twitter: twitter.com/cs50 Twitter Community: twitter.com/i/communities/1722308663522594923 YouTube: youtube.com/cs50 HOW TO FOLLOW DAVID J. MALAN Facebook: facebook.com/dmalan GitHub: github.com/dmalan Instagram: instagram.com/davidjmalan/ LinkedIn: linkedin.com/in/malan/ Quora: quora.com/profile/David-J-Malan Threads: threads.net/@davidjmalan TikTok: tiktok.com/@davidjmalan Twitter: twitter.com/davidjmalan *** CS50 SHOP cs50.harvardshop.com/ *** LICENSE CC BY-NC-SA 4.0 Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International Public License creativecommons.org/licenses/by-nc-sa/4.0/ David J. Malan https:/