static void Main(string[] args)
        {
            DisplayMessage("\nHello and welcome to my Calculator Assignment with classes!");
            Console.ReadKey();

            AskUserForNumbers.AskUserForNumberOne();
        }
        public static int CalculatorContinuation()
        {
            bool stayAlive    = true;
            int  usefulNumber = 0;

            do
            {
                try
                {
                    Program.DisplayMessage("\n\nWould you like to continue using the calculator? y/n: ");
                    char continuationChoice = char.ToUpper(Console.ReadKey(true).KeyChar);

                    stayAlive = false;

                    switch (continuationChoice)
                    {
                    case 'Y':
                        Console.Clear();
                        AskUserForNumbers.AskUserForNumberOne();
                        break;

                    case 'N':
                        stayAlive = false;
                        break;

                    default:
                        throw new Exception();
                    }
                }
                catch (Exception)
                {
                    Program.DisplayMessage("\nSomething went wrong, please try again.", ConsoleColor.Red);
                }
            } while (stayAlive);
            return(usefulNumber);
        }