#include <iostream>

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