thao tac tap tin co ban_mang(luu,doc)

#include <iostream>
#include <fstream>
#include <string>
using namespace std;
struct sinhvien
{
	string ten;
	int mssv;
	float dtb;
};
typedef sinhvien SV;
void LuuDS(SV a[],int n)// luu file
{
	ofstream FileOut;
	FileOut.open("DoAn.txt");
	if (FileOut.is_open())
	{

		for (int i = 0; i < n; i++)
		{
			FileOut << a[i].ten << ",";
			FileOut << a[i].mssv << ",";
			FileOut << a[i].dtb << endl;
		}
	}
	FileOut.close();
}
void DocDs(SV a[], int n)// doc file
{
	ifstream Filein;
	Filein.open("DoAn.txt");
	string ch;
	cout << "doc danh sach" << endl;
	if (Filein.is_open())
	{
		for (int i = 0; i < n; i++)
		{
			getline(Filein, a[i].ten, ',');
			cout << a[i].ten << endl;
			Filein >> a[i].mssv;
			cout << a[i].mssv << endl;
			Filein >> a[i].dtb;
			cout << a[i].dtb << endl;
			getline(Filein, ch, '\n');
		}
	}
	Filein.close();
}
void nhapSV(SV a[], int n)
{

	cin.ignore('\n', 10);
	for (int i = 0; i < n; i++)
	{
		cout << "nhap ten sinh vien: ";
		getline(cin, a[i].ten);
		cout << "nhap MSSV: ";
		cin >> a[i].mssv;
		cout << "nhap DTB: ";
		cin >> a[i].dtb;
		cin.ignore('\n', 10);// tranh truong hop nhận enter là tên ( không tin xoá thử để biết :))) )
	}
}

void main()
{
	SV a[100];
	int n;
	cout << "nhap so luong danh sach sinh vien: ";
	cin >> n;
	nhapSV(a,n);
	LuuDS(a, n);
	DocDs(a, n);
	system("pause");
}