C Programming for Beginners #19 | command-line arguments in C

C Programming for Beginners: Episode 19 of SyntaxPilot's free C full course, with real-life examples for every concept. command-line arguments in C. In this video you'll learn: • Why a program that asks with scanf can't run on its own • What the command line and arguments are • int main(int argc, char *argv[]) • argc counts, argv[0] is the program's name • Arguments are strings: the char * error • atoi: text to a number • Missing argument: argv[1] is NULL and the program crashes • Checking argc and printing a usage message • Exit status: return 0 and return 1 • strtol: catching bad numbers • Mini project: a bill splitter Every concept starts with a real-life example, then an animation and notes, then live code in the SyntaxPilot online compiler. Practice free in the SyntaxPilot compiler (nothing to install): https://syntaxpilot-learning-2026.web... Detailed notes for this episode (code, outputs, practice): https://syntaxpilot-learning-2026.web... Chapters 00:00 Welcome 00:19 Today's agenda 00:43 The program that keeps asking 02:31 The command line 03:17 argc and argv 05:55 Arguments are text: atoi 07:18 The missing-argument crash 08:09 Usage messages, exit status 09:49 strtol: catch bad numbers 11:04 Mini project: a bill splitter 12:49 Common mistakes 13:08 Quick quiz 13:31 Recap and homework 14:10 Next episode Next episode: Multi-file programs and header files Post your homework and quiz answer in the comments, and subscribe for the full basic-to-master playlist, free. #CProgramming #CTutorial #SyntaxPilot