using System;

class NullableTypes
{
    static void Main()
    {
         int? a = null;
        double? b = null;
        Console.WriteLine("This is integer with null value->" + a);
        Console.WriteLine("This is double with null value->" + b);
         a = 4;
         b = 2.3;
        Console.WriteLine(a);
        Console.WriteLine(b);

    }
}