Reverse of a String using Recursion

/* C Program to print Reverse of String Using Recursion */


#include

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;
}