programming-examples/c/Functions/C Program to Find the Factorial of a Number using Recursion.c

/*
 * C Program to find factorial of a given number using recursion
 */
#include <stdio.h>

int factorial(int);

int main()
{
    int num;
    int result;
    printf("Enter a number to find it's Factorial: ");
    scanf("%d", &num);
    if (num < 0)
        {
            printf("Factorial of negative number not possible\n");
        }
    else
        {
            result = factorial(num);
            printf("The Factorial of %d is %d.\n", num, result);
        }
    return 0;
}
int factorial(int num)
{
    if (num == 0 || num == 1)
        {
            return 1;
        }
    else
        {
            return(num * factorial(num - 1));
        }
}