using System;

public class Program

{

​

    public static void Main()

    {

        int? a = null;

        int? b = 300;

        if (a >= 200) {

            Console.WriteLine("a => Return false");

        } else {

            Console.WriteLine("a => Return true");

        }

        if (b >= 200) {

            Console.WriteLine("b => Return false");

        } else {

            Console.WriteLine("b => Return true");

        }

    }

}