BaiTap1_Nghia

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Demo
{
    interface IStudent
    {
        void SayHi();
        void SayBye();
    }
    interface ICode
    {
        void SayHi();
        void MakeGame();
    }
    interface IArt
    {
        void SayHi();
        void Draw();
    }
    public abstract class Unity
    {
        public abstract void Play();
        public abstract void Pause();
        int time;
    }
    public class A:IStudent,ICode,IArt
    {
        void IStudent.SayHi()
        { }
        public void SayBye()
        { }
        void ICode.SayHi()
        { }
        public void MakeGame()
        { }
        void IArt.SayHi()
        { }
        public void Draw()
        { }
    }
    public class B:Unity
    {
        public override void Play()
        { }
        public sealed override void Pause()
        { }
        public virtual void Stop()
        {
            Console.WriteLine("Stop");
        }
    }
    public class C:B
    {
        public override void Stop()
        {
            Console.WriteLine("Please Stop!!!");
        }
    }
}