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using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace ConsoleApplication26{    class Program    {        static void Main(string[] args)        {            animal a = new animal();            a.name = "animal";            a.say();            cat c = new cat();            c.name = "cat";            c.say();            dog d = new dog();            d.name = "dog";            d.say();            sheep s = new sheep();            s.name = "sheep";            s.say();            animal a1 = new cat();            a1.say();            animal a2 = new dog();            a2.say();            animal a3 = new sheep();            a3.say();        }    }    class animal    {        public string name { get; set;}        public virtual void say()        {            Console.WriteLine("animal say");        }    }    class cat : animal    {        public override void say()        {            Console.WriteLine("cat say");        }    }    class dog : animal    {        public new void say()        {            Console.WriteLine("dog say");        }    }    class sheep : animal    {    }}

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