sadahrdfaghfd

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

namespace TongHop
{
    public abstract class Sach
    {
        protected string masach;
        protected string tensach;
        protected string tacgia;
        protected double sotrang;
        protected double giaban;
        private string p1;
        private string p2;
        private int p3;
        public string Ma
        {
            get;
            set;
        }
        public double GiaBan
        {
            get { return giaban; }
            set
            {
                if (giaban > 10000)
                    value = giaban;
                else
                {
                    Console.WriteLine("ko ddc duoi 10000");
                    giaban = 0;
                }
            }
        }
        public Sach()
        {
            masach = "S001";
            tensach = "Huong DT";
            giaban = 60000;
            sotrang = 50;
        }
        public Sach(string MaSach, string TenSach, double GiaBan)
        {
            this.masach = MaSach;
            this.tensach = TenSach;
            this.giaban = GiaBan;
        }

        public void XuatTT()
        {
            Console.WriteLine("ten sach " + this.tensach);
            Console.WriteLine("Gia ban" + giaban);
        }
        abstract public double Chiphi();
        
        public interface DichVu
        {
            double PhiBaoBi();
            double PhiUopThom();
        }

    }
}