C++ while Loop

Introduction to C++ – A Comprehensive Course for Beginners C++ while Loop

In this lesson, you will learn about C++ while loop with a few examples.

C++ while Loop

Below is the syntax of the while loop in C++

Basic syntax

while (condition) {
// body of the while loop
}

In the basic syntax of the while loop,

A while loop assesses the condition.
The while loop’s body is executed if the condition evaluates to true.
The condition is once more assessed. Until the condition is false, this process keeps going. The loop ends when the condition is evaluated as false.

Example

//Program prints 3 integers
#include <iostream>

using namespace std;
int main() {
  int number = 3;
  while (number >= 1) {
    cout << number << " ";
    number--;
  }
  return 0;
}

Output

3 2 1

That’s how the program performs

Variant	Variable Update	number >= 1	Action
1st	number = 3	True	3 is printed. The number is decreased to 3.
2nd	number = 2	True	2 is printed. The number is decreased to 2.
3rd	number = 1	True	One is printed. The number is decreased to 1.
4th	number = 0	false	Program terminated

This concludes the C++ while loop lesson. The next lesson will learn about the “do while” in C++.

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