C Program to Find the Factorial of a Number using Recursion

Code:

#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));
    }
}

Output:

Enter a number to find it's Factorial: 6
The Factorial of 6 is 720.


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