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using System;
 
public class Test
{
	public static void Main()
	{
	using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
 
namespace LTHDT
{
 
    class HOCSINH
    {
        private string HoTen;
        private string MaHS;
        private string DiaChi;
        private int DiemToan;
        private int DiemVan;
        private double DiemTb;
           public void Nhap(string ghichu)
        {
            Console.WriteLine(ghichu);
            Console.WriteLine("Nhap vao ma HS :");
            this.MaHS = Console.ReadLine();
            Console.WriteLine("Nhap vao Ho va ten HS :");
            this.HoTen = Console.ReadLine();
            Console.WriteLine("Nhap vao dia chi :");
            this.DiaChi = Console.ReadLine();
            Console.WriteLine(ghichu);
            Console.WriteLine("Nhap vao Diem Toan :");
            this.DiemToan = int.Parse(Console.ReadLine());
            Console.WriteLine("Nhap vao Diem Van :");
            this.DiemVan = int.Parse(Console.ReadLine());
 
        }
        public void KhoiTaoHS(string s)
        {
            string[] M = s.Split(',');
 
            this.MaHS = M[0];
            this.HoTen = M[1];
            this.DiaChi = M[2];
            this.DiemToan = int.Parse(M[3]);
            this.DiemVan = int.Parse(M[4]);
 
 
        }
        public double TinhDiemTB()
        {
 
            this.DiemTb = (this.DiemToan * 2 + this.DiemVan) / 3.0;
            return this.DiemTb;
        }
        public void XuatHS(string ghichu)
        {
            string s = $"{this.MaHS},t{this.HoTen},t{this.DiaChi},t{this.DiemToan},t{this.DiemVan}";
            Console.WriteLine(s);
        }
            public void Luu(string filepath)
            {
 
                StreamWriter writer = new StreamWriter(filepath);
            string s = $"{this.MaHS},t{this.HoTen},t{this.DiaChi},t{this.DiemToan},t{this.DiemVan}";
                writer.WriteLine(s);
                writer.Close();
            }
    }
}
	}
}

prog.cs(7,7): error CS1525: Unexpected symbol `System', expecting `('
prog.cs(8,6): error CS1525: Unexpected symbol `System', expecting `('
prog.cs(9,6): error CS1525: Unexpected symbol `System', expecting `('
prog.cs(10,6): error CS1525: Unexpected symbol `System', expecting `('
prog.cs(11,6): error CS1525: Unexpected symbol `System', expecting `('
prog.cs(12,6): error CS1525: Unexpected symbol `System', expecting `('
prog.cs(14,0): error CS1525: Unexpected symbol `namespace'
prog.cs(15,0): error CS1525: Unexpected symbol `{'
prog.cs(17,4): error CS1525: Unexpected symbol `class'
prog.cs(18,4): error CS1525: Unexpected symbol `{'
prog.cs(19,8): error CS1525: Unexpected symbol `private'
prog.cs(20,8): error CS1525: Unexpected symbol `private'
prog.cs(21,8): error CS1525: Unexpected symbol `private'
prog.cs(22,8): error CS1525: Unexpected symbol `private'
prog.cs(23,8): error CS1525: Unexpected symbol `private'
prog.cs(24,8): error CS1525: Unexpected symbol `private'
prog.cs(25,11): error CS1525: Unexpected symbol `public'
prog.cs(25,19): error CS1547: Keyword `void' cannot be used in this context
prog.cs(25,27): error CS1525: Unexpected symbol `('
prog.cs(41,8): error CS1525: Unexpected symbol `public'
prog.cs(41,16): error CS1547: Keyword `void' cannot be used in this context
prog.cs(41,29): error CS1525: Unexpected symbol `('
prog.cs(53,8): error CS1525: Unexpected symbol `public'
prog.cs(53,32): error CS1525: Unexpected symbol `('
prog.cs(73,0): error CS1525: Unexpected symbol `}'
Compilation failed: 25 error(s), 0 warnings

Standard output is empty