Csharp/CSharp Tutorial/Operator Overload/unary minus plusplus

Overload unary - and ++

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();   
  } 
}

Here is a: 1, 2
Here is b: 10, 10
Result of -a: -1, -2
Result of a++: 2, 3