// Unary operator overloading
// Author: rajeshvs@msn.com

using System;

class Complex
{
	private int x;
	private int y;
	
	public Complex()
	{
	} 
 
	public Complex(int i, int j)
	{
		x = i;
		y = j;
	}

	public void ShowXY()
	{
		Console.WriteLine("{0} {1}",x,y);
	}

	public static Complex operator -(Complex c)
	{
		Complex temp = new Complex();
		temp.x = -c.x;
		temp.y = -c.y;
		return temp;
	}
}


class MyClient
{
	public static void Main()
	{
		Complex c1 = new Complex(10,20);
		c1.ShowXY(); // displays 10 & 20
		Complex c2 = new Complex();
		c2.ShowXY(); // displays 0 & 0
		c2 = -c1;
		c2.ShowXY(); // diapls -10 & -20
	}
}