static void Main(string[] args)
{
XYCoord t1 = new XYCoord();
XYCoord t2 = new XYCoord(8, 9);
XYCoord t3 = new XYCoord(t2);
Console.WriteLine("t1.x, t1.y: " + t1.x + ", " + t1.y);
Console.WriteLine("t2.x, t2.y: " + t2.x + ", " + t2.y);
Console.WriteLine("t3.x, t3.y: " + t3.x + ", " + t3.y);
Console.ReadKey();
}
public XYCoord(XYCoord obj)
: this(obj.x, obj.y)
{
Console.WriteLine("В конструкторе XYCoord(obj)");
}