public void HandleInput(string input) { switch (input) { case "exit": case "quit": { Console.WriteLine("Bye!"); Console.ReadKey(); Environment.Exit(0); break; } case "last": { Console.WriteLine(stack.LastAnswer); break; } case "lastp": { Console.WriteLine(stack.LastExpression); break; } default: if (!Constants.IsInputANewConst(input)) { exp.CheckIfUserInputIsValid(input); eval.EvaluateUserInput(exp.Value_1, exp.Value_2, exp.Operator); if (exp.IsValidInput) { Console.WriteLine(string.Format("{0} {1}", AnswerPrefix(), eval.ResultFromEval)); stack.SetLastExpression(exp.Value_1, exp.Value_2, exp.Operator); stack.SetLastAnswer(eval.ResultFromEval); } else { Console.WriteLine(ErrorMessages.InvalidFormat()); } } break; } PromptCounter++; }