static void Main(string[] args)
        {
            Console.OutputEncoding = System.Text.Encoding.UTF8;
            ClassBook book = new ClassBook("Vapauden risti", "Ilkka Remes", 270154, 22.90);

            book.PrintBookInfo();
            Console.WriteLine();

            ClassBook newbook = new ClassBook("Kiirastuli", "Ilkka Remes", 170265, 16.90);

            newbook.PrintBookInfo();
            Console.WriteLine();

            Console.WriteLine($"{book.CompareBook(newbook)}");
            Console.ReadKey();
        }
        static void Main(string[] args)
        {
            Console.WriteLine("Tehtävä: Kirja luokka\n");
            ClassBook Remes1 = new ClassBook("Musta Kobra", "Ilkka Remes", 1337, 32.90);
            ClassBook Remes2 = new ClassBook("Kirottu Koodi", "Ilkka Remes", 1336, 34.90);
            ClassBook Remes3 = new ClassBook("Jäätyvä helvetti", "Ilkka Remes", 1338, 29.90);

            Remes1.PrintBookInfo();
            Console.WriteLine();
            Remes2.PrintBookInfo();
            Console.WriteLine();
            Remes3.PrintBookInfo();
            Console.WriteLine();
            Console.WriteLine(Remes2.CompareBook(Remes1));
            Console.WriteLine(Remes3.CompareBook(Remes2));
            Console.WriteLine(Remes1.CompareBook(Remes3));

            Console.ReadKey();
        }