Reverse Integer using Recursion.

#include <iostream>
using namespace std;

int reverse_int(int n, int res){
    if(n == 0) return res;
    res = res*10 + (n%10);
    reverse_int(n/10, res);
}

int main()
{
    int n;
    while(cin>>n){
        cout<<reverse_int(n,0)<<endl;
    }
    return 0;
}