C++ While Loop

By: Rajesh P.S.

In C++, a while loop is a control structure that repeatedly executes a block of code as long as a specified condition remains true.

While Loop

Syntax

while (condition) { // Code to be executed repeatedly }

The condition is checked before each iteration of the loop. If the condition evaluates to true, the block of code inside the loop is executed. After the block of code is executed, the condition is checked again. The loop continues to iterate until the condition evaluates to false.

Example

#include <iostream> int main() { int count = 1; while (count <= 5) { std::cout << "Count: " << count << std::endl; count++; // Increment count to eventually make the condition false } return 0; }

In this example, the while loop prints the value of count as long as it's less than or equal to 5, and increments count in each iteration. Once count becomes 6, the condition is no longer true, and the loop exits.

While loops are useful when the number of iterations is not known in advance and depends on the outcome of the condition. However, it's crucial to ensure that the condition will eventually become false to prevent an infinite loop.

Infinite while loop

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An infinite while loop is a while loop that never terminates. Infinite while loops can be used to create programs that run continuously, such as a server or a game.

Example

The following example shows how to create an infinite while loop:

int main() { while (true) { // Code to be executed } return 0; }

This loop will continue to iterate forever, or until the program is manually terminated.

Conclusion

A while loop in C++ is a control structure that repeatedly executes a block of code as long as a specified condition remains true. It is suitable for situations where the number of iterations is not known in advance and depends on the outcome of the condition, with care needed to avoid infinite loops.

Next > C++ do...while loop

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