using System;

public class Program

{

    public static void Main()

    {

        string name = null;

        //int one = null; //Not allowed

        Nullable<int> one = null;

        Console.WriteLine("Normally number's can't be nulled, but this type returns a null for you. Remember nulls won't print...\none = " + one);

        //A shorter way of doing this

        int? two = null;

        Console.WriteLine("\nType a ? after the variable to make it nullable\ntwo = " + two);

        Console.WriteLine();

        two = 5;

        if (two.HasValue)

            Console.WriteLine(two.Value);

        two = null;

        if (two.HasValue)

            Console.WriteLine(two.Value);

        else

            Console.WriteLine("two is null");

        Console.WriteLine("The ?? assigns a value for you if a value returns null");

        bool? isTrue = null;

        bool actualValue = isTrue ?? false;

        Console.WriteLine("\n" + actualValue);

        Console.WriteLine("One more thing! Tables or Lists");

        int?[] numberTable = new int?[3]{1, 2, null};

        for( int index = 0; index < numberTable.Length; index++ )

        {

            //Console.WriteLine(numberTable?[index]?); //Null propagation not available in C# 6 

        }

    }

}