C program to Calculate Factorial of a Number Using Recursion

This program takes a positive integer from user and calculates the factorial of that number. Instead of loops to calculate factorial, this program uses recursive function to calculate the factorial of a number.

Source Code to Calculate Factorial Using Recursion


/* Source code to find factorial of a number. */

#include<stdio.h>
int factorial(int n);
int main()
{
    int n;
    printf("Enter an positive integer: ");
    scanf("%d",&n);
    printf("Factorial of %d = %ld", n, factorial(n));
    return 0;
}
int factorial(int n)
{
    if(n!=1)
     return n*factorial(n-1);
}

Output

Enter an positive integer: 6
Factorial of 6 = 720