static void Main(string[] args) { Scanner s = new Scanner() { SerialNumber = 2445 }; s.processDoc("My email: "); Console.WriteLine(s.scan()); Printer p = new Printer() { SerialNumber = 5773 }; p.processDoc("My letter"); p.print("My letter"); ComboDevice c = new ComboDevice() { SerialNumber = 6366 }; c.processDoc("My dissertation"); c.print("My dissertation"); Console.WriteLine(c.scan()); }