using System;

public class Program

{

    public static void Main()

    {

        Digit dig = new Digit(7);

        //This call invokes the implicit "double" operator

        double num = dig;

        //This call invokes the implicit "Digit" operator

        Digit dig2 = 12;

        Console.WriteLine("num = {0} dig2 = {1}", num, dig2.val);

        Console.ReadLine();

    }

}

​

public class Digit

{

    public Digit(double d) { val = d; }

    public double val;

​

    // User-defined conversion from Digit to double

    public static implicit operator double(Digit d)

    {

        Console.WriteLine("Digit to double implict conversion called");

        return d.val;

    }

    //  User-defined conversion from double to Digit

    public static implicit operator Digit(double d)

    {

        Console.WriteLine("double to Digit implict conversion called");

        return new Digit(d);

    }

}