class Point {
private: 
  double x, y;

public:
  Point();                      // (0,7)
  Point(double d);              // constructor from double:  (d, 20)
  Point(double d, double e);    // (d, e)
  Point(Point& p);              // (p.x+1, p.y+2) 

  operator double() const;      // conversion operator to double: x+y

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

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