C++ While Loop

The while loop in C++ executes a block of code repeatedly as long as a given condition evaluates to true. It is useful when the number of iterations is not known beforehand.

1. Basic While Loop Example

This example prints numbers from 1 to 5 using a while loop.

#include <iostream>
using namespace std;

int main() {
    int i = 1;
    while(i <= 5) {
        cout << i << endl;
        i++;
    }
    return 0;
}

2. Common Mistakes

A common mistake is forgetting to update the loop variable, which can result in an infinite loop. Always ensure the condition will eventually become false.

#include <iostream>
using namespace std;

int main() {
    int i = 1;
    while(i <= 5) {
        cout << i << endl;
        // i++ is missing, causing an infinite loop
    }
    return 0;
}

Conclusion

C++ while loops are useful for executing code repetitively when the number of iterations is unknown. Proper loop control ensures efficient and correct execution.