class Point {
private: 
  double x, y;

public:
  Point();                    // default constructor:  (0,7)
  Point(double x);            // (x, 20)
  Point(double x, double y);  // (x, y)  
  Point(const Point& p);      // copy constructor: (p.x+1, p.y+2) 
  Point(Point&& p);           // move constructor: (p.x-3, p.y-4) 

  double getx () const;
  double gety () const;
};

std::ostream& operator<<(std::ostream&, const Point&);