C program to calculate factorial using recursion

Write a C program to find factorial of a given number using recursion.

  #include <stdio.h>

  /* find factorial of the given number using recursion */
  int factorial(int num) {
        int res = 1;
        if (num > 0) {
                res= num  * factorial(num - 1);
        }
        return res;
  }

  int main() {
        int num, res;

        /* get the input from user  */
        printf("Enter your input:");
        scanf("%d", &num);

        /* calculate the factorial of the given number */
        res = factorial(num);

        /* print the result */
        printf("Output:%d\n", res);
        return 0;
  }

  Output:

  jp@jp-VirtualBox:~/$ ./a.out
  Enter your input:5
  Output:120