C in 100 Seconds: scanf — Read Numbers and Strings from the User | Episode 12

scanf reads input from the user. You tell it the format, and it fills in your variable. Percent d reads a number, percent s reads a word. The key detail — scanf needs the memory address of where to store the value. For ints, that means the ampersand. For arrays, the name is already an address, so no ampersand needed. Student code: https://github.com/GoCelesteAI/c-in-100-seconds/tree/main/episode12 What You'll Learn: • scanf with %d to read an integer • scanf with %s to read a string • The ampersand — giving scanf the memory address • Why arrays don't need the ampersand • Piping input from the command line with echo Next: Episode 13 — fgets (the safer way to read strings) #c #programming #100seconds #learnc #scanf #userinput #stdin #ampersand #tutorial Tags c scanf, user input c, stdin c, ampersand c, scanf format specifier, c tutorial 2026, c beginner, 100 seconds, learn c, coding tutorial