CS50x 2025 - Lecture 0 - Scratch

*** Computer Science. Computational Thinking. Problem Solving: Inputs, Outputs. Representation: Unary, Binary, Decimal, ASCII, Unicode, RGB. Abstraction. Algorithms. Running Times. Pseudocode. Scratch: Functions, Arguments, Return Values; Variables; Boolean Expressions, Conditionals; Loops; Events; Threads. *** TABLE OF CONTENTS 00:00:00 - Introduction 00:01:15 - This is CS50 00:08:35 - Computer Science 00:09:44 - Unary 00:11:28 - Binary 00:23:58 - ASCII 00:33:42 - Unicode 00:38:45 - Color 00:42:27 - Representation 00:47:20 - Algorithms 00:57:34 - Pseudocode 01:03:32 - Artificial Intelligence 01:09:21 - Scratch 01:16:15 - Hello, World 01:19:00 - Hello, You 01:27:02 - Meow 01:32:21 - Abstractions 01:37:23 - Conditionals 01:41:14 - Oscartime 01:49:52 - Ivy’s Hardest Game *** This is CS50, Harvard University's introduction to the intellectual enterprises of computer science and the art of programming. *** 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 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]