Csharp/CSharp Tutorial/Operator Overload/True false operator

Overload true and false for TwoDimension.

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); 
 
  }   
}

Here is a: 5, 6
Here is b: 10, 10
Here is c: 0, 0
a is true.
b is true.
c is false.
Control a loop using a TwoDimension object.
10, 10
9, 9
8, 8
7, 7
6, 6
5, 5
4, 4
3, 3
2, 2
1, 1

true and false operator

using System;
    public class MyType
    {
        public static bool operator true ( MyType e )
        {
            return  ( e == null ) ? false : e.b;
        }
        public static bool operator false ( MyType e )
        {
            return  ( e == null ) ? true : !e.b;
        }
        public bool b;
        public MyType( bool b )
        {
            this.b = b;
        }
        public static void Main( string[] args )
        {
            MyType myTrue = new MyType( true );
            MyType myFalse = new MyType( false );
            MyType myNull = null;
            if ( myTrue )
            {
                System.Console.WriteLine( "true" );
            }
            else
            {
                System.Console.WriteLine( "false" );
            }
            if ( myFalse )
            {
                System.Console.WriteLine( "true" );
            }
            else
            {
                System.Console.WriteLine( "false" );
            }
            if ( myNull )
            {
                System.Console.WriteLine( "true" );
            }
            else
            {
                System.Console.WriteLine( "false" );
            }
        }
    }

true
false
false

true/false operator for Complex

using System;
public struct Complex
{
    public Complex( double real, double imaginary ) {
        this.real = real;
        this.imaginary = imaginary;
    }
    public override string ToString() {
        return String.Format( "({0}, {1})", real, imaginary );
    }
    public double Magnitude {
        get {
            return Math.Sqrt( Math.Pow(this.real, 2) + Math.Pow(this.imaginary, 2) );
        }
    }
    public static bool operator true( Complex c ) {
        return (c.real != 0) || (c.imaginary != 0);
    }
    public static bool operator false( Complex c ) {
        return (c.real == 0) && (c.imaginary == 0);
    }
    private double real;
    private double imaginary;
}
public class MainClass
{
    static void Main() {
        Complex cpx1 = new Complex( 1.0, 3.0 );
        if( cpx1 ) {
            Console.WriteLine( "cpx1 is true" );
        } else {
            Console.WriteLine( "cpx1 is false" );
        }
        Complex cpx2 = new Complex( 0, 0 );
        Console.WriteLine( "cpx2 is {0}", cpx2 ? "true" : "false" );
    }
}

cpx1 is true
cpx2 is false