static void Main(string[] args)
{
point p1 = new point();
point p2 = new point();
p1.x = 2.3;
p1.y = 5.3;
p2.x = 1.2;
p2.y = 4.5;
pointInspector(p1); //p1
p1.add(p2); // Point.Add(p1, p2)
pointInspector(p1); //p1+p2
}