using System;

public class Program

{

    public static void Main()

    {

        bool? x = null;

        void show1() {

            Console.WriteLine(x ?? false || true);

        }

        void show2() {

            Console.WriteLine((x ?? false) || true);

        }

        x = null;

        show1();

        show2();

        x = false;

        show1();

        show2();

    }

}