Overload true and false for TwoDimension. : True false operator : 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  true.      
    public  static  bool  operator  true(TwoDimension  op)  {  
        if((op.x  !=  0)  ||  (op.y  !=  0))  
            return  true;  //  at  least  one  coordinate  is  non-zero  
        else  
            return  false;  
    }      
  
    //  Overload  false.  
    public  static  bool  operator  false(TwoDimension  op)  {  
        if((op.x  ==  0)  &&  (op.y  ==  0))  
            return  true;  //  all  coordinates  are  zero  
        else  
            return  false;  
    }      
  
    //  Overload  unary  --.    
    public  static  TwoDimension  operator  --(TwoDimension  op)    
    {    
        //  for  ++,  modify  argument    
        op.x--;    
        op.y--;      
    
        return  op;    
    }    
  
    //  Show  X,  Y,  Z  coordinates.      
    public  void  show()      
    {      
        Console.WriteLine(x  +  ",  "  +  y);      
    }      
}      
      
class  MainClass  {      
    public  static  void  Main()  {      
        TwoDimension  a  =  new  TwoDimension(5,  6);      
        TwoDimension  b  =  new  TwoDimension(10,  10);      
        TwoDimension  c  =  new  TwoDimension(0,  0);      
      
        Console.Write("Here  is  a:  ");      
        a.show();      
        Console.Write("Here  is  b:  ");      
        b.show();      
        Console.Write("Here  is  c:  ");      
        c.show();      
        Console.WriteLine();      
      
        if(a)  
              Console.WriteLine("a  is  true.");  
        else  
              Console.WriteLine("a  is  false.");  
  
        if(b)  
              Console.WriteLine("b  is  true.");  
        else  
              Console.WriteLine("b  is  false.");  
  
        if(c)  
              Console.WriteLine("c  is  true.");  
        else  
              Console.WriteLine("c  is  false.");  
  
        Console.WriteLine();  
  
        Console.WriteLine("Control  a  loop  using  a  TwoDimension  object.");  
        do  {  
            b.show();  
            b--;  
        }  while(b);  
  
    }      
}