using System;

​

public abstract class Horn

{

    public string vehicleName;

    public void PressHorn()

    {

        if(string.IsNullOrEmpty(vehicleName))

        {

            Console.WriteLine("Any vehicle is noising.");

        }

        else

        {

            Console.WriteLine(vehicleName + " is noising.");

        }

    }

}

​

public class Scotter : Horn

{

    public Scotter()

    {

        this.vehicleName = "Scotter";

    }

    public void StartEngine()

    {

        Console.WriteLine("Scotter start...");

    }

    public void StopEngine()

    {

     Console.WriteLine("Scotter stop...");

    }

}

​

public class Bike : Horn

{

    public Bike()

    {

    this.vehicleName = "Bike";

    }

    public void StartEngine()

    {

        Console.WriteLine("Bike start...");

    }

    public void StopEngine()

    {

     Console.WriteLine("Bike stop...");

    }

}

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        Scotter objScotter = new Scotter();

        objScotter.StartEngine();

        objScotter.PressHorn();

        objScotter.StopEngine();

        Bike objBike = new Bike();

        objBike.StartEngine();

        objBike.PressHorn();

        objBike.StopEngine();

    }

}