using System;

public class Program

{

    public static void Main()

    {

        int? x = null;

        Console.WriteLine("{0} == null => {1}", "null", x == null);

        Console.WriteLine("{0} == 0 => {1}", "null", x == 0);

        Console.WriteLine("{0} > 0 => {1}", "null", x > 0);

        x = 0;

        Console.WriteLine("{0} > 0 => {1}", x, x > 0);

        x = 1;

        Console.WriteLine("{0} > 0 => {1}", x, x > 0);

    }

}