using System;

​

public abstract class Car

{

    //normal method which does not require overide

    public void MaxSpeedInSpeedoMeter()

    {

        Console.WriteLine("Max speed in Speedo meter is 220 Km/Hour" );

    }

    //have virtual method which can be overiride but up to user

    public virtual void  MaxSpeed()

    {

        Console.WriteLine("Max speed is 140 Km/Hour" );

    }

    //abstract methos must be override in child

    public abstract void Mileage();

}

​

//must be abstract class as have one abstract method

public abstract class Honda:Car

{

    public override void  MaxSpeed()

    {

        Console.WriteLine("Max speed is 200 Km/Hour" );

    }

    //override but again make it abstract to implement in child

    public override abstract void Mileage();

}

​

public class CRV:Honda

{

    public override void  MaxSpeed()

    {

        Console.WriteLine("Max speed is 180 Km/Hour" );

    }

    public override void Mileage()

    {

    Console.WriteLine("Mileage is 16 Mile/Litre" );

    }

}

​

​

public class Program

{

    public static void Main()

    {

        Honda obj= new CRV();

        obj.MaxSpeedInSpeedoMeter();

        obj.MaxSpeed();

        obj.Mileage();

    }

}