In Part 4 of our beginner C series we move from decisions to repetition: loops . for , while and do-while can all express any repetition, but each one makes one shape of work read most clearly.

What the full guide covers:

The three loop shapes and how to pick between them : for when you know the number of passes (one per box, numbers 1 to 10), while when you repeat until a condition changes (packing until nothing remains), and do-while when the work must happen at least once (asking a question until the answer is valid).

break and continue : leave early or skip a turn without stopping everything.

Input validation loops : refuse bad input before the loop uses it, and re-ask without writing the question twice.

A side-by-side comparison table (condition checked when, runs at least once, when to reach for it) and runnable examples with verified expected output.

A taste of the style - counting down with a for loop:

#include <stdio.h> int main ( void ) { for ( int i = 3 ; i >= 1 ; i -- ) { printf ( "%d \n "…