C++ For Loop

C++ For Loop

A for loop in C++ is used to repeat a block of code a specific number of times. It is commonly used when the number of iterations is known before the loop starts.

The for loop consists of three main parts: initialization, condition, and increment/decrement. These parts control how the loop runs.

Syntax

for(initialization; condition; increment/decrement) {
    // code to be executed
}

How the For Loop Works

• Initialization – A variable is initialized before the loop starts.
• Condition – The loop continues to run as long as the condition is true.
• Increment / Decrement – Updates the loop variable after each iteration.

Example Program

#include <iostream>
using namespace std;

int main() {

    for(int i = 1; i <= 5; i++) {
        cout << "Number: " << i << endl;
    }

    return 0;
}

Output

Number: 1
Number: 2
Number: 3
Number: 4
Number: 5

Example: Printing Even Numbers

#include <iostream>
using namespace std;

int main() {

    for(int i = 2; i <= 10; i += 2) {
        cout << i << " ";
    }

    return 0;
}

Important Notes

• The for loop is best used when the number of iterations is known.
• The initialization part runs only once at the beginning.
• The condition is checked before every loop iteration.
• The increment or decrement runs after each loop iteration.

Next Topic

Next, learn about C++ While Loop.