static void Main(string[] args) { //Reference: https://sourcemaking.com/design_patterns/state string input = "0"; Fan fan = new Fan(); Console.WriteLine("The fan is turned off please insert the commands"); while (input.Equals("0") || input.Equals("1")) { Console.WriteLine("\nPress 0 to decrease the fan velocity or 1 to increase the fan velocity"); input = Console.ReadLine(); if (input.Equals("0")) { fan.DecreaseVelocity(); } else if (input.Equals("1")) { fan.IncreaseVelocity(); } } Console.WriteLine("Exiting the application ..."); Console.Read(); }