While Loop Repetition

Snippet

While Loop Repetition

A while loop repeats a block of code as long as its condition evaluates to true. The condition is checked BEFORE each iteration, so if it is false initially, the loop body never executes. Inside the loop, you must have code that eventually makes the condition false, otherwise you create an infinite loop. The countdown example shows a controlled loop that terminates when countdown reaches 0.

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

Breakdown

while (countdown > 0) {

Condition checked before each iteration, loop runs while true

countdown--;

Decrements countdown, eventually making condition false

Liftoff!

Prints after loop condition becomes false

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While Loop Repetition

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