static void Main(string[] args) { var book = new Book(); book.AddGrade(89.1); book.AddGrade(93.2); book.AddGrade(62.5); book.AddGrade(23); book.AddGrade(0); book.AddGrade(-34); book.AddGrade(101); book.AddGrade(100); book.PrintGrades(); book.RemoveGrade(3); book.PrintGrades(); }