static void Main(string[] args) { Hissi elevator = new Hissi(); bool cont = false; Console.WriteLine("Current floor >> " + elevator.Nfloor); do { Console.WriteLine("Enter new floor(1-5, 0 for exit elevator): "); int new_floor = int.Parse(Console.ReadLine()); if (new_floor == 0) { Console.WriteLine("Leaving elevator..."); cont = true; } else { elevator.Nfloor = new_floor; // if(new_floor > elevator.nfloor) Console.WriteLine("Current floor >> " + elevator.Nfloor); } } while (cont == false); Console.ReadLine(); }