using System;

public class Program

{

    public class Hocvien {

        string ten;

        int tuoi;

        double diem;

        string hocluc()

         {

            if (diem >= 9)

            {

                return "xuat sac";

            }else if(diem >= 7.5)

            {

                return "Gioi";

            }else if(diem >= 6.5)

            {

                return "Kha";

            }else if(diem >= 5)

            {

                return "Trung Binh";

            }

            else

            {

                return "Yeu";

            }

​

        }

        public void nhapthongtin()

        {

            Console.WriteLine("Nhap ten");

            ten = Console.ReadLine();

            Console.WriteLine("Nhap tuoi");

            tuoi = Convert.ToInt32(Console.ReadLine());

            Console.WriteLine("Nhap diem");

            diem = Convert.ToDouble(Console.ReadLine());

        }

        public void xuatthongtin(int sothutu) { 

            Console.WriteLine("{0}   {1}   {2}   {3}   {4}", sothutu, ten, tuoi, diem, hocluc()); 

        }

    }

    public static void Main(string[] args) {

        Hocvien[] mnv = new Hocvien[4];

        for (int i = 0; i < mnv.Length; i++)

        {

            Console.WriteLine("Nhap thong tin sinh vien {0}", i + 1);

            Hocvien x = new Hocvien();

            x.nhapthongtin();

            mnv[i] = x;

        }

    for (int i = 0; i < mnv.Length; i++)

        {

            mnv[i].xuatthongtin(i + 1);

        }

    }

}