public void Resupply(Inventory inventory) { Console.WriteLine("What do you need? Enter 'paper cups', 'lemons', 'sugar', or 'ice cubes'"); string UserInput = Console.ReadLine(); bool IsInputValid = false; while (!IsInputValid) { string input = UserInput; switch (UserInput) { case "paper cups": IsInputValid = true; inventory.AddPaperCups(); break; case "lemons": IsInputValid = true; inventory.AddLemons(); break; case "sugar": IsInputValid = true; inventory.AddSugar(); break; case "ice cubes": IsInputValid = true; inventory.AddIceCubes(); break; default: return; } inventory.PlayerTotals(); } }