using System;

​

abstract class Animal

{

    abstract public void eat();

    abstract public void drink();

}

​

interface DongVatAnThit

{

    void sanmoi();

}

​

class Person: Animal, DongVatAnThit

{

    override public void eat()

    {

        Console.WriteLine("Person Eat");

    }

    override public void drink()

    {

        Console.WriteLine("Person Drink");

    }

    public void sanmoi()

    {

        Console.WriteLine("Ăn thịt chó");

    }

}

​

class Snake: Animal, DongVatAnThit

{

    override public void eat()

    {

        Console.WriteLine("Snake Eat");

    }

    override public void drink()

    {

        Console.WriteLine("Snake Drink");

    }

    public void sanmoi()

    {

        Console.WriteLine("Ăn thịt chuột");

    }

}

​

class Lion: Animal, DongVatAnThit

{

    public static int age;

    override public void eat()

    {

        Console.WriteLine("Lion Eat");

    }

    override public void drink()

    {

        Console.WriteLine("Lion Drink");

    }

    public void sanmoi()

    {

        Console.WriteLine("Ăn thịt dê");

    }

    public static void vomoi()

    {

        Console.WriteLine("Lion Vo Moi age " + age);

    }

}

​

sealed class LacDa

{

    const int age = 0;

    public void run()

    {

        Console.WriteLine("Lac Da Run");

    }

}

​

public class Program

{

    public static void Main()

    {

        Person dan = new Person();

        Snake snake = new Snake();

        Lion lion = new Lion();

        dan.eat();

        dan.drink();

        dan.sanmoi();

        snake.eat();

        snake.drink();

        snake.sanmoi();

        lion.eat();

        lion.drink();

        lion.sanmoi();

        Lion.age += 5;

        Lion.vomoi();

        Lion.age += 5;

        Lion.vomoi();

​

    }

}