Лабораторная работа4 / point

struct Point
{
	Point() {}
	Point(double xx, double yy, double zz) : x(xx), y(yy), z(zz) {}
	
	Point operator -(const Point& o)
	{
		double xx, yy, zz;
		xx = x - o.x;
		yy = y - o.y;
		zz = z - o.z;
		return Point(xx, yy, zz);
	}
	double x, y, z;
};