REVERSE A NUMBER USING RECURSION IN C PROGRAM

#include<stdio.h>

int main(){

int num,rev;

printf("\nEnter a number :");

scanf("%d",&num);

rev=reverse(num);

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

return 0;

}

int sum=0,r;

reverse(int num){

if(num){

r=num%10;

sum=sum*10+r;

reverse(num/10);

}

else

return sum;

return sum;

}