Calculate factorial of a Number (e.g., 5!) using for loop in C language

This C program calculates the factorial of a given number using a for loop.

The factorial of a number (denoted as n!) is the product of all positive integers from 1 to n. For example, the factorial of 5 (written as 5!) is 5 × 4 × 3 × 2 × 1 = 120.

In this program, the user provides a number, and the for loop multiplies each integer from 1 to that number, storing the result in a variable. This method demonstrates how to use loops for repetitive multiplication and is a classic example used to understand loop-based logic in C programming.

#include <stdio.h>

int main() {
    int num = 5;
    int fact = 1;

    for (int i = 1; i <= num; i++) {
        fact *= i;
    }

    printf("Factorial of %d is %d\n", num, fact);
    return 0;
}

Output:-

Factorial of 5 is 120