9. Using named rectangles

• The main() function uses named rectangles as follows:

  
  int main()
  {
      Rectangle rect( "first", 333, 222 );
  
      Rectangle rect2 = rect; // make a copy
      rect2.set_name( "second" );
  
      std::cout << "rectangle width: " << rect.width << '\n';
      std::cout << "rectangle height: " << rect.height << '\n';
      std::cout << "rectangle area: " << rect.area() << '\n';
      std::cout << "rectangle name: " << rect.get_name() << '\n' << '\n';
  
      std::cout << "rectangle width: " << rect2.width << '\n';
      std::cout << "rectangle height: " << rect2.height << '\n';
      std::cout << "rectangle area: " << rect2.area() << '\n';
      std::cout << "rectangle name: " << rect2.get_name() << '\n' << '\n';
      return 0;
  }