using System;

​

namespace CNA

{

    public class Vehicle

    {

        public string Name { get; set; }

        public string EngineType { get; set; }

        public int Mileage { get; set; }

        public void Start()

        {

            Console.WriteLine(Name + "starting...");

        }

        public void Stop()

        {

            Console.WriteLine(Name + "has stopped.");

        }

    }

​

    public class Bus : Vehicle

    {

        public int DeckCount { get; set; }

    }

    public class Airplane : Vehicle

    {

        public void TakeOff()

        {

            Console.WriteLine("Prepare for take off!");

        }

        public void Land()

        {

            Console.WriteLine("We are about to descend...");

        }

    }

​

​

    public class Program

    {

        public static void Main(string[] args)

        {

​

            Airplane a = new Airplane();

            a.TakeOff();

            a.Land();

​

        }

    }

}

​