static void Main(string[] args) { string[] options = { "Display a list of all books", "Display a list of loaners", "Add a new book to the library", "Register a new loaner", "Loan a book", "Return a book" }; bool isRunning = true; Library lib = new Library(); while (isRunning) { for (int i = 0; i < options.Length; i += 1) { Console.WriteLine(i + 1 + ") " + options[i]); } string input = Console.ReadLine(); if (input == "") { continue; } Console.Clear(); switch (input[0]) { case '1': lib.DisplayAllBooks(); break; case '2': lib.DisplayAllLoaners(); break; case '3': lib.AddBookToLibrary(); break; case '4': lib.NewLoaner(); break; case '5': lib.LoanBook(); break; case '6': lib.ReturnBook(); break; } Console.WriteLine(); lib.WriteToFiles(); } }