Overload unary - and ++ : Unary minus plusplus : Operator Overload C# Examples

    
using  System;  
  
class  TwoDimension  {  
    int  x,  y;
  
    public  TwoDimension()  {  
          x  =  y  =  0;  
    }  
    public  TwoDimension(int  i,  int  j)  {  
          x  =  i;  
          y  =  j;
    }  
  
    //  Overload  unary  -.  
    public  static  TwoDimension  operator  -(TwoDimension  op)  
    {  
        TwoDimension  result  =  new  TwoDimension();  
  
        result.x  =  -op.x;  
        result.y  =  -op.y;    
  
        return  result;  
    }  
  
    //  Overload  unary  ++.  
    public  static  TwoDimension  operator  ++(TwoDimension  op)  
    {  
        //  for  ++,  modify  argument  
        op.x++;  
        op.y++;    
  
        return  op;  
    }  
  
    //  Show  X,  Y  
    public  void  show()  
    {  
        Console.WriteLine(x  +  ",  "  +  y);  
    }  
}  
  
class  MainClass  {  
    public  static  void  Main()  {  
        TwoDimension  a  =  new  TwoDimension(1,  2);  
        TwoDimension  b  =  new  TwoDimension(10,  10);  
        TwoDimension  c  =  new  TwoDimension();  
  
        Console.Write("Here  is  a:  ");  
        a.show();  
        Console.WriteLine();  
        Console.Write("Here  is  b:  ");  
        b.show();  
        Console.WriteLine();  
  
        c  =  -a;  //  assign  -a  to  c  
        Console.Write("Result  of  -a:  ");  
        c.show();  
        Console.WriteLine();  
  
        a++;  //  increment  a  
        Console.Write("Result  of  a++:  ");  
        a.show();      
    }  
}