struct Student
{
	char fullName[N];
	int course;
	int group;
};

bool operator < (Student& student1, Student &student2)
{
	return student1.group < student2.group;
}

// /*
void addRecordToBack()
{
	Student student;
	int n = 0;
	cout << "Введите кол-во новых записей: "; cin >> n;
	fstream file("student.bin", ios::binary | ios::out | ios::app);
	cin.clear();
	while (cin.get() != '\n');
	for (int i = 0; i < n; i++)
	{
		while (cin.get() != '\n');
		cin.clear();
		cout << "фио "; cin.getline(student.fullName, N, '\n');
		cout << "курс: "; cin >> student.course;
		cout << "группа "; cin >> student.group;
		file.write(reinterpret_cast<char*>(&student), sizeof(student));

	}
	file.close();
}
//*/

int numberOfRecords()
{
	Student item;
	ifstream file;
	file.open("student.bin");
	file.seekg(0, ios::end);
	int result = file.tellg() / sizeof(item);
	file.close();
	return result;
}

vector<Student> getAllRecordsFromFile()
{
	int countOfRecords = numberOfRecords();
	vector<Student> arrayOfRecords(countOfRecords);
	fstream file("student.bin", ios::binary | ios::in);
	for (int i = 0; i < countOfRecords; i++)
		file.read(reinterpret_cast<char*>(&arrayOfRecords[i]), sizeof(arrayOfRecords[i]));
	file.close();
	return arrayOfRecords;
}

int main()
{
	vector<Student> students = getAllRecordsFromFile();
	setlocale(0, "");
	sort(students.begin(), students.end());
	for (int i = 0; i < students.size(); i++)
	{
		cout << "фио " << students[i].fullName;
		cout << "\nкурс: " << students[i].course;
		cout << "\nгруппа " << students[i].group;
		cout << endl;
	}
	fstream file("student1.bin", ios::binary | ios::out);
	file.close();
	file.open("student1.bin", ios::binary | ios::out);
	for (int i = 0; i < students.size(); i++)
		file.write(reinterpret_cast<char*>(&students[i]), sizeof(students[i]));
	file.close();
	return 0;
}