using System;

public class Calc

{

  public int num1 { get; set; }

  public int num2 { get; set; }

  public Calc(int n1, int n2)

  {

    num1 = n1;

    num2 = n2;

  }

​

  // Overload to reverse each number's sign

  // Using the unary minus operator

  public static Calc operator -(Calc calc)

  {

    calc.num1 = -calc.num1;

    calc.num2 = -calc.num2;

    return calc;

  }

}

​

public class Program

{

  public static void Main()

  {

    Calc calc = new Calc(43, -21);

    calc = -calc;

    Console.WriteLine("Num1 = {0}", calc.num1);

    Console.WriteLine("Num2 = {0}", calc.num2);

  }

}