public void HienThiDanhSach()
{
int n;
Console.WriteLine("\nnhap so sach:");
n = Int32.Parse(Console.ReadLine());
SachGiaoKhoa[] sgk = new SachGiaoKhoa[n];
for (int i = 0; i < n; i++)
{
sgk[i] = new SachGiaoKhoa();
sgk[i].NhapThongTinSach();
sgk[i].HienThiSach();
}
}
static void Main(string[] args)
{
Console.Write("\nCau a");
Book sach1 = new Book();
sach1.NhapThongTinSach();
sach1.HienThiSach();
Console.Write("\nCau b");
SachGiaoKhoa sach2 = new SachGiaoKhoa();
sach2.NhapThongTinSach();
sach2.HienThiSach();
Console.Write("\nCau c");
SachMain sach3 = new SachMain();
sach3.HienThiDanhSach();
Console.ReadKey();
}
