C++ Programming Language

#include <iostream>
using namespace std;

int main(int argc, const char * argv[])
{
    int input = 123;
    int temp, r, output = 0;
    temp = input;

    while (temp > 0) {
        r = temp % 10;
        temp = temp / 10;
        output = output * 10 + r;
    }

    cout << "Original Number : " << input << "\n";
    cout << "Reverse Number : " << output << "\n";
    
    return 0;
}