static void Main(string[] args) { // Create health tracker. HealthTracker tracker = new HealthTracker(); Greeting(); Console.WriteLine("\nUser input: "); while (true) { ConsoleKeyInfo key = Console.ReadKey(); switch (key.KeyChar) { case 'h': case 'H': tracker.Stop(); Greeting(); break; case 'r': case 'R': tracker.Reset(); break; case 'q': case 'Q': tracker.Quit(); break; default: tracker.RunOrStop(); Console.Write("\nUser input: "); break; } } }