C program to reverse any number using recursion

Write a C program to find reverse a number using recursion.

  #include <stdio.h>

  /* finds the reverse of val and store it in res */
  int reverseNum(int val, int *res) {
        int rem;

        /* reverse of the given number manipulation */
        if (val) {
                rem = val % 10;
                *res = (*res * 10) + rem;
                reverseNum(val/10, res);
        }
        return;
  }

  int main() {
        int val, res = 0;

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

        printf("Reverse of %d is ", val);

        /* finds the reverse of the given number */
        reverseNum(val, &res);

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

  Output:

  jp@jp-VirtualBox:~/$ ./a.out
  Enter your input value:12345
  Reverse of 12345 is 54321