CS50x 2025 - Lecture 0 - Scratch

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*** 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 HOW TO TAKE CS50 edX: Harvard Extension School: Harvard Summer School: OpenCourseWare: HOW TO JOIN CS50 COMMUNITIES Discord: Ed: Facebook Group: Faceboook Page: GitHub: Gitter: Instagram: LinkedIn Group: LinkedIn Page: Medium: Quora: Reddit: Slack: Snapchat: SoundCloud: Stack Exchange: Telegram: Threads: TikTok: Twitter: Twitter Community: YouTube: HOW TO FOLLOW DAVID J. MALAN Facebook: GitHub: Instagram: LinkedIn: Quora: Threads: TikTok: Twitter: *** CS50 SHOP *** LICENSE CC BY-NC-SA 4.0 Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International Public License David J. Malan [email protected]






