static void Main(string[] args) { DigitalClock digitalClock = new DigitalClock(); Console.WriteLine(digitalClock.DigitalClockInfo()); FlipClock flipClock = new FlipClock(); Console.WriteLine(flipClock.FlipClockInfo()); QuartzClock quartzClock = new QuartzClock(); Console.WriteLine(quartzClock.QuartzClockInfo()); }