REVERSE A NUMBER USING RECURSION

#include<stdio.h> 

#include<conio.h>
 

void main()

{

  int num,rev;

  clrscr();

  printf("\nEnter a number :");

  scanf("%d",&num);

  rev=reverse(num);

  printf("\nAfter reverse the no is :%d",rev);

  getch();

}

  int sum=0,r;

  reverse(int num)

  {

    if(num)

   {

            r=num%10;

            sum=sum*10+r;

            reverse(num/10);

   }

   else

            return sum;

}