using System;

​

//Create parent/base class

​

class Animal

{

    public void Greet()

    {

        Console.WriteLine("I am animal");

    }

}

​

//Create child/derived class

class Cat : Animal

{

    public void Meow()

    {

        Console.WriteLine("Meow");

    }

}

public class Program

{

    public static void Main()

    {

        Animal animal1 = new Animal();

        animal1.Greet();

        Cat cat1 = new Cat();

        cat1.Greet();

        cat1.Meow();

    }

}