private static void Main(string[] args) { string text = string.Empty; while (text != exit) { Console.WriteLine("Input text for calculate average length of words, 0 for exit"); text = Console.ReadLine(); switch (text) { case empty: Console.WriteLine("You input empty string, try again"); break; case exit: Console.WriteLine("Press any key for exit"); Console.ReadKey(); return; default: MyString obj = new MyString(text); Console.WriteLine("Average length of words :{0}", obj.Average_word_length()); break; } } }