// esercizio 3: Point2D
class Point2D {
	private:
		float x, y; // coordinate
	public:
		// methods
		float get_x() { return x; };
		float get_y() { return y; };

		// operators overloading
		const Point2D operator=(const Point2D &copy) {
			if(&copy == this)
				return *this;

			x = copy.x;
			y = copy.y;

			return *this;
		}

		const Point2D operator++(int) {
			x++;
			y++;

			return *this;
		}

		const Point2D operator++() {
			x++;
			y++;

			return *this;
		}

		const Point2D operator--() {
			x--;
			y--;

			return *this;
		}

		const Point2D operator--(int) {
			x--;
			y--;

			return *this;
		}
		
		const Point2D operator+(const Point2D &op) {
			Point2D r(*this);

			r.x += op.x;
			r.y += op.y;

			return r;
		}

		const Point2D operator-(const Point2D &op) {
			Point2D r(*this);

			r.x -= op.x;
			r.y -= op.y;

			return r;
		}

		// ctors
		Point2D() 
		: x(0), y(0)
		{ }
		Point2D(float nx, float ny)
		: x(nx), y(ny)
		{ }
		Point2D(const Point2D &copy)
		: x(copy.x), y(copy.y)
		{ }
};