using System;

using System.Xml;

using System.Linq;

using System.Collections.Generic;

using System.Text.RegularExpressions;

using System.IO;

public class Program

{

    public static void Main()

    {

​

        decimal? d = null;

        Console.WriteLine("Value is:" + (double?)d);

        Console.WriteLine((double)d);

​

    }

}