Csharp/CSharp Tutorial/Operator Overload/Cast operator

explicit/implicit operator for Complex

<source lang="csharp">using System; public struct Complex {

   public Complex( double real, double imaginary ) {
       this.real = real;
       this.imaginary = imaginary;
   }
   // System.Object override
   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 implicit operator Complex( double d ) {
       return new Complex( d, 0 );
   }
   public static explicit operator double( Complex c ) {
       return c.Magnitude;
   }
   private double real;
   private double imaginary;

} public class EntryPoint {

   static void Main() {
       Complex cpx1 = new Complex( 1.0, 3.0 );
       Complex cpx2 = 2.0;         // Use implicit operator.
       double d = (double) cpx1;   // Use explicit operator.
       Console.WriteLine( "cpx1 = {0}", cpx1 );
       Console.WriteLine( "cpx2 = {0}", cpx2 );
       Console.WriteLine( "d = {0}", d );
   }

}</source>

cpx1 = (1, 3)
cpx2 = (2, 0)
d = 3.16227766016838

implicit and explicit operator cast

<source lang="csharp">using System;

   class MyType
   {
       int value;
       public MyType( int b )
       {
           value = b;
       }
       public static implicit operator int( MyType a )
       {
           return a.value;
       }
       public static explicit operator string( MyType a )
       {
           return "$" + a.value;
       }
       static void Main(string[] args)
       {
           MyType bal = new MyType( 777 );
           Console.WriteLine("since int conversion is implicit we can write");
           int i = bal;
           Console.WriteLine("string conveersion must be explicitly requested");
           string str = (string)bal;
           // this causes a compilation error
           // str = bal;
           System.Console.WriteLine( "i = {0} \nstr = {1}", i, str );
       }
   }</source>

since int conversion is implicit we can write
string conveersion must be explicitly requested
i = 777
str = $777