C#编程语言

答案：
using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApplication8
{
    class Program
    {
        public class Animal
        {
            public bool IsSleeping;
            public void Sleep() 
            {
                Console.WriteLine("Sleeping");
            }
            public void Eat() { }
        }
            public class Antelope :Animal{}
        
            public class Lion :Animal
            {
                public void StalkPrey() { }
            }
        public class Elephant : Animal
        {
           public extern int CarryCapacity();
        }

            

        static void Main(string[] args)
        {
            Elephant e = new Elephant();
            e.Sleep();
        }
    }
}
using System;
using System.Collections.Generic;
using System.Text;

namespace paishengleiApp
{
    public class Animal
    {
        public bool IsSleeping;

        public void Sleep()
        {
            Console.WriteLine("Sleeping");
        }
        public void Eat() 
        {
        }
     }

     public class Antelope :Animal
     {
     }

     public class Lion :Animal
     {
        public void StalkPrey() 
        { 
        }
     }

     public class Elephant : Animal 
     {
        public int CarryCapacity();
        Elephant e = new Elephant();
        public void ppp()
        {
            e.Sleep();
        }
     }
} 

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