factorial-recursion

 #include <stdio.h>

int factorial(int a);

int main()

{

    int a = 5;

    printf("The factorial of %d is:%d\n", a, factorial(a));

    return 0;

}

int factorial(int x)

{

    if (x == 0 || x == 1)

    {

        return 1;

    }

    else

    {

        return x * factorial(x - 1);

    }

}