public static void Main(string[] args)
{
PointRef pr = null; //new PointRef(2,3);
PointRef pr1 = new PointRef(5, 3);
PointRef pr2 = pr.Add(pr1);
PointValue pv = new PointValue(4, 5);
PointValue pv1 = new PointValue(5, 3);
PointValue pv2 = pv.Add(pv1);
}
public PointValue Add(PointValue p)
{
return(new PointValue(this.X + p.X, this.Y + p.Y));
}