While Loops: Iteration with Unknown Count

Snippet

While Loops: Iteration with Unknown Count

A while loop repeats code as long as a condition remains true. The condition is checked BEFORE each iteration, so the loop body might never execute if the condition is initially false. In this example, countdown starts at 5 and decreases until it reaches 0.

snippet.cpp
cpp
#include <iostream>
 
 
int main() {
    int countdown = 5;
    
    while (countdown > 0) {
        std::cout << countdown << std::endl;
        countdown = countdown - 1;
    }
    
    std::cout << "Liftoff!" << std::endl;
    return 0;
}

Breakdown

while (countdown > 0) {

Loop condition - repeats while countdown is greater than 0

countdown = countdown - 1;

Decrements countdown by 1 each iteration

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While Loops: Iteration with Unknown Count

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