#include <iostream>

int main( void )
{
        int num;
        std::cout << "Enter a number: ";
        while ( std::cin >> num && num != 0 ) {
                int square = num * num;
                std::cout << "Square of " << num << " = " << square << '\n';
                std::cout << "Enter a number (0 to quit) \n";
        }
}