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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 LOPHOC
    {
        private string TenLop;
        private string GVCN;
        private HOCSINH[] DSHocSinh;
        public void Nhap(string ghichu)
        {
            Console.WriteLine(ghichu);
            Console.WriteLine("Nhap vao Ten Lop :");
            this.TenLop = Console.ReadLine();
            Console.WriteLine("Nhap vao GVCN :");
            this.GVCN = Console.ReadLine();  
            Console.WriteLine("Nhap vao So luong HS trong lop :");
            int SoluongHS = int.Parse(Console.ReadLine());
 
            DSHocSinh = new HOCSINH[SoluongHS];
            for(int i =0;i<SoluongHS;i++)
            {
                DSHocSinh[i] = new HOCSINH();
                DSHocSinh[i].Nhap("Nhap vao hoc sinh thu: " + (i+1)+":");
            }
        }
        public HOCSINH TimHSDiemTBCN()
        {
            HOCSINH kq=new HOCSINH();
            kq = DSHocSinh[0];
            double DTBCaoNhat, DTB;
            DTBCaoNhat = DSHocSinh[0].TinhDiemTB();
            for(int i=1;i<DSHocSinh.Length;i++)
            {
                DTB = DSHocSinh[i].TinhDiemTB();
                if(DTB>DTBCaoNhat)
                {
                    kq = DSHocSinh[i];
                    DTBCaoNhat = DTB;
                }
            }
            return kq;
        }
        public void XuatHSDiemTBCN()
        {
            HOCSINH DTBCN = new HOCSINH();
            DTBCN = this.TimHSDiemTBCN();
            DTBCN.XuatHS("Hoc sinh co diem TB lon nhat");
        }
 
        public void KhoitaolopHoc(string filepath)
        {
            StreamReader reader = new StreamReader(filepath);
            this.TenLop = reader.ReadLine();
            this.GVCN = reader.ReadLine();
            int SoluongHS = int.Parse(Console.ReadLine());
 
            DSHocSinh = new HOCSINH[SoluongHS];
            for (int i = 0; i < SoluongHS; i++)
            {
                DSHocSinh[i] = new HOCSINH();
                DSHocSinh[i].KhoiTaoHS(reader.ReadLine());
            }
            reader.Close();
        }
        public void Luu(string filepath)
        {
 
            StreamWriter writer = new StreamWriter(filepath);
            writer.WriteLine(this.TenLop);
            writer.WriteLine(this.GVCN);
            writer.WriteLine(this.DSHocSinh.Count());
            foreach (HOCSINH hs in DSHocSinh)
            {
                hs.Luu(writer);
 
            }
            writer.Close();
        }
    }
}
 
	}
}

prog.cs(7,8): 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(16,4): error CS1525: Unexpected symbol `class'
prog.cs(17,4): error CS1525: Unexpected symbol `{'
prog.cs(18,8): error CS1525: Unexpected symbol `private'
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 `public'
prog.cs(21,16): error CS1547: Keyword `void' cannot be used in this context
prog.cs(21,24): error CS1525: Unexpected symbol `('
prog.cs(38,8): error CS1525: Unexpected symbol `public'
prog.cs(38,36): error CS1525: Unexpected symbol `('
prog.cs(55,8): error CS1525: Unexpected symbol `public'
prog.cs(55,16): error CS1547: Keyword `void' cannot be used in this context
prog.cs(55,34): error CS1525: Unexpected symbol `('
prog.cs(92,0): error CS1525: Unexpected symbol `}'
Compilation failed: 22 error(s), 0 warnings

Standard output is empty