#pragma once
#include<string>
#include<vector>
#include<iostream>
#include<fstream>
#include<sstream>
#include<string>
using namespace std;

class Student
{
private:
?? ?int id; ? ? ? ? ? ? ? ? ? ? ? ? ?//student's ID number
?? ?int year; ? ? ? ? ? ? ? ? ? ? ? ?//student's grade
?? ?string name;
?? ?string password;
?? ?string gender;
?? ?string telephone;
?? ?string address; ? ? ? ? ? ? ? ? ?//student's name, password, gender, telephone number and address
?? ?vector<int> book;
?? ?vector<int> grade; ? ? ? ? ? ? ? //student's books and their marks
public:
?? ?Student();
?? ?~Student();
?? ?Student(int a, int b, string c, string d, string e, string f, string g);
?? ?//constructors
?? ?int get_id();
?? ?int get_year();
?? ?string get_name();
?? ?string get_pass();
?? ?string get_gend();
?? ?string get_tele();
?? ?string get_addr();
?? ?vector<int> get_book(); ? ? ? ? ?//get the variables of class
?? ?void change(int a, int b, string c, string d, string e, string f, string g);
?? ?//change the information
?? ?void display(); ? ? ? ? ? ? ? ? ?//display the information on the screen
?? ?int length(); ? ? ? ? ? ? ? ? ? ?//get the number of all students
?? ?bool canopen(); ? ? ? ? ? ? ? ? ?//check whether the file 'student.txt' can be opened
?? ?void write(); ? ? ? ? ? ? ? ? ? ?//write the information current into file 'student.txt'
?? ?void read(int n); ? ? ? ? ? ? ? ?//read the information of the number n student from file 'student.txt'
?? ?void write_book(); ? ? ? ? ? ? ? //write the books information of the student into file 'mybook.txt'?
?? ?void read_book(); ? ? ? ? ? ? ? ?//read the infomation of the student from file 'mybook.txt'
?? ?void change_book(int a, int b); ?//change the information of vector book and grade
?? ?void add_book(int a); ? ? ? ? ? ?//add a new book
?? ?void display_book(); ? ? ? ? ? ? //display the information of books on the screen
?? ?void add_student(); ? ? ? ? ? ? ?//add a student into the file 'mybook.txt'
?? ?void sub_student(); ? ? ? ? ? ? ?//subtract a student in the file 'mybook.txt'
?? ?bool is_same_book(int a); ? ? ? ?//check whether there exist a same book in the file 'mybook.txt'
};

Student::Student()
{
?? ?id = 0;
?? ?year = 0;
?? ?name = "not given";
?? ?password = "not given";
?? ?gender = "not given";
?? ?telephone = "not given";
?? ?address = "not given"; ? ? ? ? ? ? //define the default constructor
}

Student::~Student() {}

Student::Student(int a, int b, string c, string d, string e, string f, string g)
{
?? ?id = a;
?? ?year = b;
?? ?name = c;
?? ?password = d;
?? ?gender = e;
?? ?telephone = f;
?? ?address = g; ? ? ? ? ? ? ? ? ? ? ? //define the normal constructor
}

int Student::get_id()
{
?? ?return id;
}

int Student::get_year()
{
?? ?return year;
}

string Student::get_name()
{
?? ?return name;
}

string Student::get_pass()
{
?? ?return password;
}

string Student::get_gend()
{
?? ?return gender;
}

string Student::get_tele()
{
?? ?return telephone;
}

string Student::get_addr()
{
?? ?return address;
}

vector<int> Student::get_book()
{
?? ?return book;
}

void Student::change(int a, int b, string c, string d, string e, string f, string g)
{
?? ?id = a;
?? ?year = b;
?? ?name = c;
?? ?password = d;
?? ?gender = e;
?? ?telephone = f;
?? ?address = g;
}

void Student::display()
{
?? ?cout << "Name: ? " << name << endl;
?? ?cout << "ID number: ? " << id << endl;
?? ?cout << "Grade: ? " << year << endl;
?? ?cout << "Gender: ? " << gender << endl;
?? ?cout << "Telephone: ? " << telephone << endl;
?? ?cout << "Address: ? " << address << endl << endl;
}

int Student::length()
{
?? ?int i = 0;
?? ?string temp;
?? ?ifstream fin("student.txt");
?? ?while (getline(fin, temp))
?? ??? ?i += 1;
?? ?fin.close();
?? ?return i;
}

bool Student::canopen()
{
?? ?ifstream fin1("student.txt");
?? ?ifstream fin2("mybook.txt");
?? ?if (fin1&&fin2)
?? ??? ?return 1;
?? ?else
?? ??? ?return 0;
?? ?fin1.close();
?? ?fin2.close();
}

void Student::write()
{
?? ?ofstream fout("student.txt", ios::app);
?? ?fout << id << "\t" << year << "\t" << name << "\t" << password << "\t" << gender << "\t" << telephone << "\t" << address << endl;
?? ?fout.close();
}

void Student::read(int n)
{
?? ?int i = 0;
?? ?string temp, data[999], a[6];
?? ?ifstream fin("student.txt");
?? ?while (getline(fin, temp))
?? ?{
?? ??? ?data[i] = temp;
?? ??? ?i += 1;
?? ?}
?? ?fin.close();
?? ?istringstream stream(data[n]);
?? ?for (i = 0; i < 6; i++)
?? ?{
?? ??? ?data[n].erase(0, data[n].find("\t") + 1);
?? ??? ?a[i] = data[n].substr(0, data[n].find("\t"));
?? ?}
?? ?name = a[1];
?? ?password = a[2];
?? ?gender = a[3];
?? ?telephone = a[4];
?? ?address = a[5];
?? ?stream >> id >> year;
}

void Student::write_book()
{
?? ?int i, n, l = 0;
?? ?string data[999], temp;
?? ?ifstream fin("mybook.txt");
?? ?while (getline(fin, temp))
?? ?{
?? ??? ?data[l] = temp;
?? ??? ?l += 1;
?? ?}
?? ?fin.close();

?? ?ofstream fout("mybook.txt");
?? ?for (i = 0; i < l; i++)
?? ?{
?? ??? ?istringstream stream(data[i]);
?? ??? ?stream >> n;
?? ??? ?if (n == id)
?? ??? ?{
?? ??? ??? ?fout << id;
?? ??? ??? ?for (int i = 0; i < book.size(); i++)
?? ??? ??? ??? ?fout << "\t" << book[i] << "\t" << grade[i];
?? ??? ??? ?fout << endl;
?? ??? ?}
?? ??? ?else
?? ??? ??? ?fout << data[i] << endl;
?? ?}
?? ?fout.close();
}

void Student::read_book()
{
?? ?int i = 0, x, y, n;
?? ?string data[999], temp;
?? ?ifstream fin("mybook.txt");
?? ?while (getline(fin, temp))
?? ?{
?? ??? ?data[i] = temp;
?? ??? ?i += 1;
?? ?}
?? ?fin.close();
?? ?for (i = 0; i < 999; i++)
?? ?{
?? ??? ?istringstream stream(data[i]);
?? ??? ?stream >> n;
?? ??? ?if (id == n)
?? ??? ??? ?while (stream >> x >> y)
?? ??? ??? ?{
?? ??? ??? ??? ?book.push_back(x);
?? ??? ??? ??? ?grade.push_back(y);
?? ??? ??? ?}
?? ?}
}

void Student::change_book(int a, int b)
{
?? ?int i;
?? ?for (i = 0; i < book.size(); i++)
?? ??? ?if (book[i] == a)
?? ??? ??? ?grade[i] = b;
}

void Student::add_book(int a)
{
?? ?book.push_back(a);
?? ?grade.push_back(-1);
}

void Student::display_book()
{
?? ?int i;
?? ?for (i = 0; i < book.size(); i++)
?? ?{
?? ??? ?cout << book[i] << "\t\t";
?? ??? ?if (grade[i] == -1)
?? ??? ??? ?cout << "None." << endl;
?? ??? ?else
?? ??? ??? ?cout << grade[i] << endl;
?? ?}
}

void Student::add_student()
{

?? ?ofstream fout("mybook.txt", ios::app);
?? ?fout << id << endl;
?? ?fout.close();
}

void Student::sub_student()
{
?? ?int i = 0, n, m, l;
?? ?string data[999], temp;
?? ?ifstream fin("mybook.txt");
?? ?while (getline(fin, temp))
?? ?{
?? ??? ?data[i] = temp;
?? ??? ?i += 1;
?? ?}
?? ?fin.close();
?? ?l = i;
?? ?for (i = 0; i < l; i++)
?? ?{
?? ??? ?istringstream stream(data[i]);
?? ??? ?stream >> n;
?? ??? ?if (id == n)
?? ??? ??? ?m = i;
?? ?}
?? ?ofstream fout("mybook.txt");
?? ?for (i = 0; i < l; i++)
?? ??? ?if (i != m)
?? ??? ??? ?fout << data[i] << endl;
?? ?fout.close();
}

bool Student::is_same_book(int a)
{
?? ?int i;
?? ?bool success = 0;
?? ?for (i = 0; i < book.size(); i++)
?? ??? ?if (book[i] == a)
?? ??? ??? ?success = 1;
?? ?return success;
}

#pragma once
#include<iostream>
#include<fstream>
#include<string>
#include<sstream>
using namespace std;

class Book
{
private:
?? ?int id;
?? ?string name;
?? ?string professor; ? ? ? ? ? ? ? ?//the information of a book
?? ?int place; ? ? ? ? ? ? ? ? ? ? ? //left seats
?? ?int year; ? ? ? ? ? ? ? ? ? ? ? ?//available to which grades
public:
?? ?Book();
?? ?~Book();
?? ?Book(int a, string b, string c, int d, int e);
?? ?int get_id();
?? ?string get_name();
?? ?string get_prof();
?? ?int get_place();
?? ?int get_year(); ? ? ? ? ? ? ? ? ?//get the variables of class
?? ?void change(int a, string b, string c, int d, int e);
?? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? //change the information
?? ?void display(); ? ? ? ? ? ? ? ? ?//display the information on the screen
?? ?int length(); ? ? ? ? ? ? ? ? ? ?//get the number of all the Books
?? ?bool canopen(); ? ? ? ? ? ? ? ? ?//check whether the file 'book.txt' can be opened
?? ?void write(); ? ? ? ? ? ? ? ? ? ?//write the information into the file 'book.txt'
?? ?void read(int n); ? ? ? ? ? ? ? ?//read the information of number n book form the file 'book.txt'
};


Book::Book()
{
?? ?name = "not given";
?? ?id = 0;
?? ?professor = "not given";
?? ?place = 0;
?? ?year = 0; ? ? ? ? ? ? ? ? ? ? ? ? //difine the default constructor
}


Book::~Book() {}

Book::Book(int a, string b, string c, int d, int e)
{
?? ?id = a;
?? ?name = b;
?? ?professor = c;
?? ?place = d;
?? ?year = e; ? ? ? ? ? ? ? ? ? ? ? ? //define the normal constructor
}

int Book::get_id()
{
?? ?return id;
}
string Book::get_name()
{
?? ?return name;
}
string Book::get_prof()
{
?? ?return professor;
}
int Book::get_place()
{
?? ?return place;
}
int Book::get_year()
{
?? ?return year;
}

void Book::change(int a, string b, string c, int d, int e)
{
?? ?id = a;
?? ?name = b;
?? ?professor = c;
?? ?place = d;
?? ?year = e;
}

void Book::display()
{
?? ?cout << "Name: ? " << name << endl;
?? ?cout << "ID number: ? " << id << endl;
?? ?cout << "Professor: ? " << professor << endl;
?? ?cout << "Left seats: ? " << place << endl;
?? ?cout << "Available grade: ? ";
?? ?if (year > 0 && year < 5)
?? ??? ?cout << "year " << year;
?? ?else if (year == 5)
?? ??? ?cout << "All of students.";
?? ?else
?? ??? ?cout << "error in data.";
?? ?cout << endl << endl;
}

int Book::length()
{
?? ?int i = 0;
?? ?string temp;
?? ?ifstream fin("book.txt");
?? ?while (getline(fin, temp))
?? ??? ?i += 1;
?? ?fin.close();
?? ?return i;
}

bool Book::canopen()
{
?? ?ifstream fin1("book.txt");
?? ?if (fin1)
?? ??? ?return 1;
?? ?else
?? ??? ?return 0;
?? ?fin1.close();
}

void Book::write()
{
?? ?ofstream fout("book.txt", ios::app);
?? ?fout << id << "\t" << place << "\t" << year << "\t" << name << "\t" << professor << "\t" << endl;
?? ?fout.close();
}

void Book::read(int n)
{
?? ?int i = 0;
?? ?string temp, data[999], a[4];
?? ?ifstream fin("book.txt");
?? ?while (getline(fin, temp))
?? ?{
?? ??? ?data[i] = temp;
?? ??? ?i += 1;
?? ?}
?? ?fin.close();
?? ?istringstream stream(data[n]);
?? ?for (i = 0; i < 4; i++)
?? ?{
?? ??? ?data[n].erase(0, data[n].find("\t") + 1);
?? ??? ?a[i] = data[n].substr(0, data[n].find("\t"));
?? ?}
?? ?name = a[2];
?? ?professor = a[3];
?? ?stream >> id >> place >> year;
}

#include<iostream>
#include<string>
#include<vector>
#include"Book.h"
#include"Student.h"
using namespace std;

void initialize();
bool is_administrator();
bool is_student(int *n);
void menu1();
void menu2();
void menu3();
void wrong_input();
void mag_book();
void mag_student();
void show_book_list();
void show_student_list();
void give_mark();
void change_password();
void choose_book(int n);
void my_book(int n);
void check_info(int n);
void can_open(Book a);
void can_open(Student a);
bool is_same_student_name(string n);
bool is_same_student_tele(string n);
bool is_same_student_addr(string n);
bool is_same_book_name(string n);

int main()
{
?? ?int user;
?? ?char choice;
?? ?bool success = 0;
?? ?initialize();
?? ?do {
?? ??? ?menu1();
?? ??? ?cin >> choice;
?? ??? ?switch (choice)
?? ??? ?{
?? ??? ?case'1':
?? ??? ?{
?? ??? ??? ?if (is_administrator()) {
?? ??? ??? ??? ?do {
?? ??? ??? ??? ??? ?menu2();
?? ??? ??? ??? ??? ?cin >> choice;
?? ??? ??? ??? ??? ?getchar();
?? ??? ??? ??? ??? ?switch (choice)
?? ??? ??? ??? ??? ?{
?? ??? ??? ??? ??? ?case'1':mag_book(); success = 0; break;
?? ??? ??? ??? ??? ?case'2':mag_student(); success = 0; break;
?? ??? ??? ??? ??? ?case'3':show_book_list(); success = 0; break;
?? ??? ??? ??? ??? ?case'4':show_student_list(); success = 0; break;
?? ??? ??? ??? ??? ?case'5':give_mark(); success = 0; break;
?? ??? ??? ??? ??? ?case'6':change_password(); success = 0; break;
?? ??? ??? ??? ??? ?case'9':success = 1; break;
?? ??? ??? ??? ??? ?case'0':success = 1; break;
?? ??? ??? ??? ??? ?default:wrong_input(); break;
?? ??? ??? ??? ??? ?}
?? ??? ??? ??? ?} while (!success);
?? ??? ??? ?}
?? ??? ??? ?else
?? ??? ??? ?{
?? ??? ??? ??? ?cout << "The password is incorrect." << endl;
?? ??? ??? ??? ?system("pause");
?? ??? ??? ?}
?? ??? ?}
?? ??? ?break;
?? ??? ?case'2':
?? ??? ?{
?? ??? ??? ?if (is_student(&user))
?? ??? ??? ?{
?? ??? ??? ??? ?do {
?? ??? ??? ??? ??? ?menu3();
?? ??? ??? ??? ??? ?cin >> choice;
?? ??? ??? ??? ??? ?switch (choice)
?? ??? ??? ??? ??? ?{
?? ??? ??? ??? ??? ?case'1':choose_book(user); success = 0; break;
?? ??? ??? ??? ??? ?case'2':my_book(user); success = 0; break;
?? ??? ??? ??? ??? ?case'3':check_info(user); success = 0; break;
?? ??? ??? ??? ??? ?case'9':success = 1; break;
?? ??? ??? ??? ??? ?case'0':success = 1; break;
?? ??? ??? ??? ??? ?default:wrong_input(); break;
?? ??? ??? ??? ??? ?}
?? ??? ??? ??? ?} while (!success);
?? ??? ??? ?}
?? ??? ??? ?else
?? ??? ??? ?{
?? ??? ??? ??? ?cout << "Your name or password is incorrect." << endl;
?? ??? ??? ??? ?system("pause");
?? ??? ??? ?}
?? ??? ?}
?? ??? ?break;
?? ??? ?case'0':success = 1; break;
?? ??? ?default:wrong_input(); break;
?? ??? ?}
?? ?} while (choice != '0');
?? ?return 0;
}

void initialize()
{
?? ?ifstream infile1("book.txt");
?? ?if (!infile1)
?? ?{
?? ??? ?ofstream outfile1("book.txt");
?? ??? ?outfile1.close();
?? ?}
?? ?infile1.close();
?? ?ifstream infile2("student.txt");
?? ?if (!infile2)
?? ?{
?? ??? ?ofstream outfile2("student.txt");
?? ??? ?outfile2.close();
?? ?}
?? ?infile2.close();
?? ?ifstream infile3("password.txt");
?? ?if (!infile3)
?? ?{
?? ??? ?ofstream outfile3("password.txt");
?? ??? ?outfile3 << "123";
?? ??? ?outfile3.close();
?? ?}
?? ?infile3.close();
?? ?ifstream infile4("mybook.txt");
?? ?if (!infile4)
?? ?{
?? ??? ?ofstream outfile4("mybook.txt");
?? ??? ?outfile4.close();
?? ?}
?? ?infile4.close();
}
bool is_administrator()
{
?? ?string p1, p2;
?? ?getchar();
?? ?cout << "Please input the password:";
?? ?getline(cin, p1);
?? ?ifstream infile("password.txt");
?? ?if (!infile)
?? ?{
?? ??? ?cout << endl << "Out of service" << endl;
?? ??? ?cout << "Please press enter to exit." << endl;
?? ??? ?system("pause");
?? ??? ?exit(0);
?? ?}
?? ?getline(infile, p2);
?? ?infile.close();
?? ?if (p1 == p2)
?? ??? ?return 1;
?? ?else
?? ??? ?return 0;
}
bool is_student(int *n)
{
?? ?Student a[100];
?? ?Student s;
?? ?string p1, p2;
?? ?int i;
?? ?bool success = 0;
?? ?getchar();
?? ?cout << "Please input your name:";
?? ?getline(cin, p1);
?? ?cout << "Please input your password:";
?? ?getline(cin, p2);
?? ?can_open(s);
?? ?for (i = 0; i < s.length(); i++)
?? ?{
?? ??? ?a[i].read(i);
?? ??? ?if (a[i].get_name() == p1 && a[i].get_pass() == p2)
?? ??? ?{
?? ??? ??? ?*n = i;
?? ??? ??? ?success = 1;
?? ??? ?}
?? ?}
?? ?return success;
}
void menu1()
{
?? ?system("cls");
?? ?cout << endl << endl << endl;
?? ?cout << "-------------------------------------------------------------------" << endl;
?? ?cout << " ? ? ? ? ? ? ? ?University Student Management System ? ? ? ? ? ? ? " << endl << endl;
?? ?cout << " ? ? ?1.Administrator System." << endl << endl;
?? ?cout << " ? ? ?2.Student System." << endl << endl;
?? ?cout << " ? ? ?0.Exit." << endl;
?? ?cout << "-------------------------------------------------------------------" << endl;
?? ?cout << "Please input your choice:";
}
void menu2()
{
?? ?system("cls");
?? ?cout << endl << endl << endl;
?? ?cout << "-------------------------------------------------------------------" << endl;
?? ?cout << " ? ? ? ? ? ? ? ? ? ? ? ? ?Administrator System ? " << endl << endl;
?? ?cout << " ? ? ?1.Book Management." << endl << endl;
?? ?cout << " ? ? ?2.Student Management." << endl << endl;
?? ?cout << " ? ? ?3.Show the Book List." << endl << endl;
?? ?cout << " ? ? ?4.Show the Student List." << endl << endl;
?? ?cout << " ? ? ?5.Give Marks to Students." << endl << endl;
?? ?cout << " ? ? ?6.Change Administrator Password." << endl << endl;
?? ?cout << " ? ? ?9.Return to the main menu." << endl << endl;
?? ?cout << " ? ? ?0.Exit." << endl;
?? ?cout << "-------------------------------------------------------------------" << endl;
?? ?cout << "Please input your choice:";
}
void menu3()
{
?? ?system("cls");
?? ?cout << endl << endl << endl;
?? ?cout << "-------------------------------------------------------------------" << endl;
?? ?cout << " ? ? ? ? ? ? ? ? ? ? ? ? ?Student System" << endl << endl;
?? ?cout << " ? ? ?1.Choose My Books" << endl << endl;
?? ?cout << " ? ? ?2.Check My Books and Grades" << endl << endl;
?? ?cout << " ? ? ?3.Check and Change My Infomation" << endl << endl;
?? ?cout << " ? ? ?9.Return to the main menu." << endl << endl;
?? ?cout << " ? ? ?0.Exit." << endl;
?? ?cout << "-------------------------------------------------------------------" << endl;
?? ?cout << "Please input your choice:";
}
void wrong_input()
{
?? ?system("cls");
?? ?cout << endl << endl << endl << endl << endl << endl;
?? ?cout << " ? ? ? ? ? ? ? ? ? ? ? ?Wrong input! Please input again." << endl;
?? ?system("pause");
}
void mag_book()
{
?? ?int i, id, plac, year;
?? ?char choice;
?? ?bool success = 0, success2 = 0;
?? ?string name, prof;
?? ?Book a[50];
?? ?Book c;
?? ?do {
?? ??? ?fflush(stdin);
?? ??? ?system("cls");
?? ??? ?cout << endl << " ? ? ? ? ? ? ? ? ? ? Book Management" << endl << endl;
?? ??? ?cout << "Which operation do you want about the list of book?" << endl;
?? ??? ?cout << "1.Browse a book\n\n2.Add a book\n\n3.Modify a book\n\n4.Delete a book\n\n";
?? ??? ?cin >> choice;
?? ??? ?cout << "Please input the ID number of book:";
?? ??? ?cin >> id;
?? ??? ?getchar();
?? ??? ?can_open(c);
?? ??? ?if (choice == '1')
?? ??? ?{
?? ??? ??? ?success2 = 1;
?? ??? ??? ?fflush(stdin);
?? ??? ??? ?for (i = 0; i < c.length(); i++)
?? ??? ??? ??? ?a[i].read(i);
?? ??? ??? ?for (i = 0; i < c.length(); i++)
?? ??? ??? ??? ?if (id == a[i].get_id())
?? ??? ??? ??? ?{
?? ??? ??? ??? ??? ?system("cls");
?? ??? ??? ??? ??? ?a[i].display();
?? ??? ??? ??? ??? ?success = 1;
?? ??? ??? ??? ?}
?? ??? ??? ?if (!success)
?? ??? ??? ??? ?cout << "The book cannot be found.";
?? ??? ?}
?? ??? ?else if (choice == '2')
?? ??? ?{
?? ??? ??? ?success2 = 1;
?? ??? ??? ?fflush(stdin);
?? ??? ??? ?for (i = 0; i < c.length(); i++)
?? ??? ??? ?{
?? ??? ??? ??? ?a[i].read(i);
?? ??? ??? ??? ?if (id == a[i].get_id())
?? ??? ??? ??? ??? ?success = 1;
?? ??? ??? ?}
?? ??? ??? ?if (success)
?? ??? ??? ??? ?cout << "The book is exist";
?? ??? ??? ?else
?? ??? ??? ?{
?? ??? ??? ??? ?do {
?? ??? ??? ??? ??? ?cout << "Please input the name of book:";
?? ??? ??? ??? ??? ?getline(cin, name);
?? ??? ??? ??? ?} while (is_same_book_name(name));
?? ??? ??? ??? ?cout << "Please input the professor's name:";
?? ??? ??? ??? ?getline(cin, prof);
?? ??? ??? ??? ?cout << "Please input the maximum quota of people(connot change later):";
?? ??? ??? ??? ?cin >> plac;
?? ??? ??? ??? ?cout << "Which grades are available?" << endl << "1. year 1\n2. year 2\n3. year 3\n4. year 4\n5. all of students\n";
?? ??? ??? ??? ?cin >> year;
?? ??? ??? ??? ?c.change(id, name, prof, plac, year);
?? ??? ??? ??? ?c.write();
?? ??? ??? ??? ?system("cls");
?? ??? ??? ??? ?cout << "The book has been saved." << endl << endl;
?? ??? ??? ??? ?c.display();
?? ??? ??? ?}
?? ??? ?}
?? ??? ?else if (choice == '3')
?? ??? ?{
?? ??? ??? ?success2 = 1;
?? ??? ??? ?fflush(stdin);
?? ??? ??? ?int l, n;
?? ??? ??? ?l = c.length();
?? ??? ??? ?for (i = 0; i < l; i++)
?? ??? ??? ?{
?? ??? ??? ??? ?a[i].read(i);
?? ??? ??? ??? ?if (id == a[i].get_id())
?? ??? ??? ??? ?{
?? ??? ??? ??? ??? ?n = i;
?? ??? ??? ??? ??? ?success = 1;
?? ??? ??? ??? ?}
?? ??? ??? ?}
?? ??? ??? ?if (success)
?? ??? ??? ?{
?? ??? ??? ??? ?do {
?? ??? ??? ??? ??? ?cout << "Please input the new name of book " << id << ":";
?? ??? ??? ??? ??? ?getline(cin, name);
?? ??? ??? ??? ?} while (is_same_book_name(name));
?? ??? ??? ??? ?cout << "Please input the new professor's name of book " << id << ":";
?? ??? ??? ??? ?getline(cin, prof);
?? ??? ??? ??? ?cout << "Which grades are available?" << endl << "1. year 1\n2. year 2\n3. year 3\n4. year 4\n5. all of students\n";
?? ??? ??? ??? ?cin >> year;
?? ??? ??? ??? ?a[n].change(id, name, prof, a[n].get_place(), year);
?? ??? ??? ??? ?ofstream fout("book.txt");
?? ??? ??? ??? ?fout.close();
?? ??? ??? ??? ?for (i = 0; i < l; i++)
?? ??? ??? ??? ??? ?a[i].write();
?? ??? ??? ??? ?system("cls");
?? ??? ??? ??? ?cout << "The book has been changed." << endl << endl;
?? ??? ??? ??? ?a[n].display();
?? ??? ??? ?}
?? ??? ??? ?else
?? ??? ??? ??? ?cout << "The book " << id << " cannot be found.";
?? ??? ?}
?? ??? ?else if (choice == '4')
?? ??? ?{
?? ??? ??? ?success2 = 1;
?? ??? ??? ?fflush(stdin);
?? ??? ??? ?int n, l = c.length();
?? ??? ??? ?for (i = 0; i < l; i++)
?? ??? ??? ?{
?? ??? ??? ??? ?a[i].read(i);
?? ??? ??? ??? ?if (id == a[i].get_id())
?? ??? ??? ??? ?{
?? ??? ??? ??? ??? ?n = i;
?? ??? ??? ??? ??? ?success = 1;
?? ??? ??? ??? ?}
?? ??? ??? ?}
?? ??? ??? ?if (success)
?? ??? ??? ?{
?? ??? ??? ??? ?ofstream fout("book.txt");
?? ??? ??? ??? ?fout.close();
?? ??? ??? ??? ?for (i = 0; i < l - 1; i++)
?? ??? ??? ??? ??? ?if (i != n)
?? ??? ??? ??? ??? ??? ?a[i].write();
?? ??? ??? ??? ?system("cls");
?? ??? ??? ??? ?cout << "The book has been deleted." << endl << endl;
?? ??? ??? ??? ?a[n].display();
?? ??? ??? ?}
?? ??? ??? ?else
?? ??? ??? ??? ?cout << "The book " << id << " cannot be found.";
?? ??? ?}
?? ??? ?else
?? ??? ?{
?? ??? ??? ?cout << "wrong input, please input again." << endl;
?? ??? ??? ?system("pause");
?? ??? ?}
?? ?} while (!success2);
?? ?cout << endl;
?? ?system("pause");
}
void mag_student()
{
?? ?int i, id, year;
?? ?char choice;
?? ?bool success = 0, success2 = 0;
?? ?string name, pass, gend, tele, addr;
?? ?Student a[50];
?? ?Student s;
?? ?do {
?? ??? ?system("cls");
?? ??? ?cout << endl << " ? ? ? ? ? ? ? ? ? ? Student Management" << endl << endl;
?? ??? ?cout << "Which operation do you want about the list of student?" << endl;
?? ??? ?cout << "1.Browse a student\n2.Add a student\n3.Modify a student\n4.Delete a student\n";
?? ??? ?cin >> choice;
?? ??? ?cout << "Please input the ID number of student:";
?? ??? ?cin >> id;
?? ??? ?getchar();
?? ??? ?can_open(s);
?? ??? ?if (choice == '1')
?? ??? ?{
?? ??? ??? ?success2 = 1;
?? ??? ??? ?fflush(stdin);
?? ??? ??? ?for (i = 0; i < s.length(); i++)
?? ??? ??? ??? ?a[i].read(i);
?? ??? ??? ?for (i = 0; i < s.length(); i++)
?? ??? ??? ??? ?if (id == a[i].get_id())
?? ??? ??? ??? ?{
?? ??? ??? ??? ??? ?system("cls");
?? ??? ??? ??? ??? ?a[i].display();
?? ??? ??? ??? ??? ?success = 1;
?? ??? ??? ??? ?}
?? ??? ??? ?if (!success)
?? ??? ??? ??? ?cout << "The student cannot be found.";
?? ??? ?}
?? ??? ?else if (choice == '2')
?? ??? ?{
?? ??? ??? ?success2 = 1;
?? ??? ??? ?fflush(stdin);
?? ??? ??? ?for (i = 0; i < s.length(); i++)
?? ??? ??? ?{
?? ??? ??? ??? ?a[i].read(i);
?? ??? ??? ??? ?if (id == a[i].get_id())
?? ??? ??? ??? ??? ?success = 1;
?? ??? ??? ?}
?? ??? ??? ?if (success)
?? ??? ??? ??? ?cout << "The student is exist";
?? ??? ??? ?else
?? ??? ??? ?{
?? ??? ??? ??? ?do {
?? ??? ??? ??? ??? ?cout << "Please input the name of student:";
?? ??? ??? ??? ??? ?getline(cin, name);
?? ??? ??? ??? ?} while (is_same_student_name(name));
?? ??? ??? ??? ?cout << "Please input the password:";
?? ??? ??? ??? ?getline(cin, pass);
?? ??? ??? ??? ?do {
?? ??? ??? ??? ??? ?cout << "What grade is the student in? (1-4)";
?? ??? ??? ??? ??? ?cin >> year;
?? ??? ??? ??? ?} while (year < 1 || year>4);
?? ??? ??? ??? ?fflush(stdin);
?? ??? ??? ??? ?do {
?? ??? ??? ??? ??? ?cout << "Please input the student's gender:" << endl << "Please enter 'male' or 'female' ?:";
?? ??? ??? ??? ??? ?getline(cin, gend);
?? ??? ??? ??? ?} while (!(gend == "male" || gend == "female"));
?? ??? ??? ??? ?do {
?? ??? ??? ??? ??? ?cout << "Please input the telephone number:";
?? ??? ??? ??? ??? ?getline(cin, tele);
?? ??? ??? ??? ?} while (is_same_student_tele(tele));
?? ??? ??? ??? ?do {
?? ??? ??? ??? ??? ?cout << "Please input the address:";
?? ??? ??? ??? ??? ?getline(cin, addr);
?? ??? ??? ??? ?} while (is_same_student_addr(addr));
?? ??? ??? ??? ?s.change(id, year, name, pass, gend, tele, addr);
?? ??? ??? ??? ?s.add_student();
?? ??? ??? ??? ?s.write();?? ??? ??? ?
?? ??? ??? ??? ?system("cls");
?? ??? ??? ??? ?cout << "The information of student has been saved." << endl << endl;
?? ??? ??? ??? ?s.display();?? ??? ?
?? ??? ??? ??? ?}
?? ??? ?}
?? ??? ?else if (choice == '3')
?? ??? ?{
?? ??? ??? ?success2 = 1;
?? ??? ??? ?fflush(stdin);
?? ??? ??? ?int l, n;
?? ??? ??? ?l = s.length();
?? ??? ??? ?for (i = 0; i < l; i++)
?? ??? ??? ?{
?? ??? ??? ??? ?a[i].read(i);
?? ??? ??? ??? ?if (id == a[i].get_id())
?? ??? ??? ??? ?{
?? ??? ??? ??? ??? ?n = i;
?? ??? ??? ??? ??? ?success = 1;
?? ??? ??? ??? ?}
?? ??? ??? ?}
?? ??? ??? ?if (success)
?? ??? ??? ?{
?? ??? ??? ??? ?do {
?? ??? ??? ??? ??? ?cout << "Please input the new name of student " << id << ":";
?? ??? ??? ??? ??? ?getline(cin, name);
?? ??? ??? ??? ?} while (is_same_student_name(name));
?? ??? ??? ??? ?pass = a[n].get_pass();
?? ??? ??? ??? ?do {
?? ??? ??? ??? ??? ?cout << "What grade is the student in? (1-4)";
?? ??? ??? ??? ??? ?cin >> year;
?? ??? ??? ??? ?} while (year < 1 || year>4);
?? ??? ??? ??? ?fflush(stdin);
?? ??? ??? ??? ?do {
?? ??? ??? ??? ??? ?cout << "Please input the student's gender:" << endl << "Please enter 'male' or 'female' ?:";
?? ??? ??? ??? ??? ?getline(cin, gend);
?? ??? ??? ??? ?} while (!(gend == "male" || gend == "female"));
?? ??? ??? ??? ?do {
?? ??? ??? ??? ??? ?cout << "Please input the new telephone number:";
?? ??? ??? ??? ??? ?getline(cin, tele);
?? ??? ??? ??? ?} while (is_same_student_tele(tele));
?? ??? ??? ??? ?do {
?? ??? ??? ??? ??? ?cout << "Please input the new address:";
?? ??? ??? ??? ??? ?getline(cin, addr);
?? ??? ??? ??? ?} while (is_same_student_addr(addr));
?? ??? ??? ??? ?a[n].change(id, year, name, pass, gend, tele, addr);
?? ??? ??? ??? ?ofstream fout("student.txt");
?? ??? ??? ??? ?fout.close();
?? ??? ??? ??? ?for (i = 0; i < l; i++)
?? ??? ??? ??? ??? ?a[i].write();
?? ??? ??? ??? ?system("cls");
?? ??? ??? ??? ?cout << "The student has been changed." << endl << endl;
?? ??? ??? ??? ?a[n].display();
?? ??? ??? ?}
?? ??? ??? ?else
?? ??? ??? ??? ?cout << "The student " << id << " cannot be found.";
?? ??? ?}
?? ??? ?else if (choice == '4')
?? ??? ?{
?? ??? ??? ?success2 = 1;
?? ??? ??? ?fflush(stdin);
?? ??? ??? ?int n, l = s.length();
?? ??? ??? ?for (i = 0; i < l; i++)
?? ??? ??? ?{
?? ??? ??? ??? ?a[i].read(i);
?? ??? ??? ??? ?if (id == a[i].get_id())
?? ??? ??? ??? ?{
?? ??? ??? ??? ??? ?n = i;
?? ??? ??? ??? ??? ?success = 1;
?? ??? ??? ??? ?}
?? ??? ??? ?}
?? ??? ??? ?if (success)
?? ??? ??? ?{
?? ??? ??? ??? ?a[n].sub_student();
?? ??? ??? ??? ?ofstream fout("student.txt");
?? ??? ??? ??? ?fout.close();
?? ??? ??? ??? ?for (i = 0; i < l; i++)
?? ??? ??? ??? ??? ?if (i != n)
?? ??? ??? ??? ??? ??? ?a[i].write();
?? ??? ??? ??? ?system("cls");
?? ??? ??? ??? ?cout << "The student has been deleted." << endl << endl;
?? ??? ??? ??? ?a[n].display();
?? ??? ??? ?}
?? ??? ??? ?else
?? ??? ??? ??? ?cout << "The student " << id << " cannot be found.";
?? ??? ?}
?? ??? ?else
?? ??? ?{
?? ??? ??? ?cout << "Wrong input, please input again." << endl;
?? ??? ??? ?system("pause");
?? ??? ?}
?? ?} while (!success2);
?? ?cout << endl;
?? ?system("pause");
}
void show_book_list()
{
?? ?Book a[100];
?? ?Book c;
?? ?int i;
?? ?system("cls");
?? ?cout << endl << " ? ? ? ? ? ? ? ? ? ? Books List" << endl << endl;
?? ?can_open(c);
?? ?for (i = 0; i < c.length(); i++)
?? ?{
?? ??? ?a[i].read(i);
?? ??? ?a[i].display();
?? ?}
?? ?cout << endl;
?? ?system("pause");
}
void show_student_list()
{
?? ?Student a[100];
?? ?Student s;
?? ?int i;
?? ?system("cls");
?? ?cout << endl << " ? ? ? ? ? ? ? ? ? ? Students List" << endl << endl;
?? ?can_open(s);
?? ?for (i = 0; i < s.length(); i++)
?? ?{
?? ??? ?a[i].read(i);
?? ??? ?a[i].display();
?? ?}
?? ?cout << endl;
?? ?system("pause");
}
void give_mark()
{
?? ?int i, j, k = 0, id, temp;
?? ?bool success = 0;
?? ?vector<int> student, mark;
?? ?Student a[999];
?? ?Student s;
?? ?Book b[999];
?? ?Book c;
?? ?system("cls");
?? ?cout << endl << " ? ? ? ? ? ? ? ? ? ? Give Marks" << endl << endl;
?? ?cout << "Please input the ID number of book:";
?? ?cin >> id;
?? ?for (i = 0; i < c.length(); i++)
?? ?{
?? ??? ?b[i].read(i);
?? ??? ?if (b[i].get_id() == id)
?? ??? ??? ?success = 1;
?? ?}
?? ?if (!success)
?? ??? ?cout << "The book " << id << " is not exist." << endl;
?? ?else
?? ?{
?? ??? ?cout << "These student(s) are your student(s):";
?? ??? ?for (i = 0; i < s.length(); i++)
?? ??? ?{
?? ??? ??? ?a[i].read(i);
?? ??? ??? ?a[i].read_book();
?? ??? ??? ?for (j = 0; j < a[i].get_book().size(); j++)
?? ??? ??? ??? ?if (id == a[i].get_book()[j])
?? ??? ??? ??? ?{
?? ??? ??? ??? ??? ?k += 1;
?? ??? ??? ??? ??? ?cout << endl << k << ". " << a[i].get_name();
?? ??? ??? ??? ??? ?student.push_back(i);
?? ??? ??? ??? ??? ?break;
?? ??? ??? ??? ?}
?? ??? ?}
?? ??? ?cout << endl << "Please give marks;" << endl;
?? ??? ?for (i = 0; i < k; i++)
?? ??? ?{
?? ??? ??? ?cout << a[student[i]].get_name() << ": ? ";
?? ??? ??? ?cin >> temp;
?? ??? ??? ?a[student[i]].change_book(id, temp);
?? ??? ?}
?? ??? ?for (i = 0; i < s.length(); i++)
?? ??? ??? ?a[i].write_book();
?? ??? ?cout << endl << "Giving marks successfully!";
?? ?}
?? ?cout << endl;
?? ?system("pause");
}
void change_password()
{
?? ?string p1, p2, p3;
?? ?system("cls");
?? ?cout << endl << " ? ? ? ? ? ? ? ? Change Administrator Password." << endl << endl;
?? ?cout << "Please input the password:";
?? ?getline(cin, p1);
?? ?ifstream infile("password.txt");
?? ?if (!infile)
?? ?{
?? ??? ?cout << endl << "Out of service" << endl;
?? ??? ?cout << "Please press enter to exit." << endl;
?? ??? ?system("pause");
?? ??? ?exit(0);
?? ?}
?? ?getline(infile, p2);
?? ?infile.close();
?? ?if (p1 == p2)
?? ?{
?? ??? ?cout << "Please input the new password:";
?? ??? ?getline(cin, p3);
?? ??? ?ofstream outfile("password.txt");
?? ??? ?outfile << p3;
?? ??? ?outfile.close();
?? ??? ?cout << "The administrator password has been changed.";
?? ?}
?? ?else
?? ??? ?cout << "Wrong password.";
?? ?cout << endl;
?? ?system("pause");
}
void choose_book(int n)
{
?? ?int i, l, m, id;
?? ?bool success = 0;
?? ?bool can_choose[999];
?? ?Student a[999];
?? ?Student s;
?? ?Book b[999];
?? ?Book c;
?? ?system("cls");
?? ?cout << endl << " ? ? ? ? ? ? ? ? ? ? Choose My Books" << endl << endl;
?? ?can_open(s);
?? ?can_open(c);
?? ?l = c.length();
?? ?for (i = 0; i < s.length(); i++)
?? ?{
?? ??? ?a[i].read(i);
?? ??? ?a[i].read_book();
?? ?}
?? ?cout << " ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Welcome," << a[n].get_name() << endl << endl;
?? ?for (i = 0; i < l; i++)
?? ?{
?? ??? ?b[i].read(i);
?? ??? ?if (((b[i].get_year() == a[n].get_year()) || b[i].get_year() == 5) && (b[i].get_place() > 0))
?? ??? ?{
?? ??? ??? ?can_choose[i] = 1;
?? ??? ??? ?cout << "Status: ? Available" << endl;
?? ??? ??? ?b[i].display();
?? ??? ?}
?? ??? ?else
?? ??? ?{
?? ??? ??? ?can_choose[i] = 0;
?? ??? ??? ?cout << "Status: ? Unavailable" << endl;
?? ??? ??? ?b[i].display();
?? ??? ?}
?? ?}

?? ?do {
?? ??? ?cout << "Please input the ID number of the book you want to choose:";
?? ??? ?cin >> id;
?? ??? ?success = 0;
?? ??? ?for (i = 0; i < l; i++)
?? ??? ??? ?if (b[i].get_id() == id)
?? ??? ??? ?{
?? ??? ??? ??? ?m = i;
?? ??? ??? ??? ?success = 1;
?? ??? ??? ?}
?? ?} while (!success);
?? ?system("cls");
?? ?cout << endl << endl << endl;
?? ?if (can_choose[m])
?? ?{
?? ??? ?if (a[n].is_same_book(id))
?? ??? ??? ?cout << " ? ? ? ? ? ? ? ? ?You have selected the book " << id << endl;
?? ??? ?else
?? ??? ?{
?? ??? ??? ?b[m].change(b[m].get_id(), b[m].get_name(), b[m].get_prof(), b[m].get_place() - 1, b[m].get_year());
?? ??? ??? ?ofstream outfile("book.txt");
?? ??? ??? ?outfile.close();
?? ??? ??? ?for (i = 0; i < l; i++)
?? ??? ??? ??? ?b[i].write();
?? ??? ??? ?a[n].add_book(id);
?? ??? ??? ?a[n].write_book();
?? ??? ??? ?cout << "Here is the list of your books now:" << endl << endl << "ID\t\tGrade" << endl;
?? ??? ??? ?a[n].display_book();
?? ??? ?}
?? ?}
?? ?else
?? ??? ?cout << " ? ? ? ? ? ? ? The book '" << b[m].get_name() << "' cannot be selected." << endl;
?? ?system("pause");
}
void my_book(int n)
{
?? ?int i, l;
?? ?Student a[999];
?? ?Student s;
?? ?system("cls");
?? ?cout << endl << " ? ? ? ? ? ? ? ? ? ? Check My Books ang Grades" << endl << endl;
?? ?can_open(s);
?? ?l = s.length();
?? ?for (i = 0; i < l; i++)
?? ??? ?a[i].read(i);
?? ?cout << " ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Welcome," << a[n].get_name() << endl << endl;
?? ?a[n].read_book();
?? ?cout << "Book ID\tGrade" << endl << endl;
?? ?a[n].display_book();
?? ?system("pause");
}
void check_info(int n)
{
?? ?int i, l;
?? ?char choice;
?? ?bool success = 0;
?? ?string tele, addr, pass;
?? ?Student a[999];
?? ?Student s;
?? ?system("cls");
?? ?cout << endl << " ? ? ? ? ? ? ? ? ? ? Check and Change My Information" << endl << endl;
?? ?can_open(s);
?? ?l = s.length();
?? ?for (i = 0; i < l; i++)
?? ??? ?a[i].read(i);
?? ?cout << " ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Welcome," << a[n].get_name() << endl << endl;
?? ?a[n].display();
?? ?cout << endl << "Enter 1: Change my information." << endl;
?? ?cout << "Enter 2: Change my password." << endl;
?? ?cout << "Enter else: Return to the student menu:";
?? ?cin >> choice;
?? ?getchar();
?? ?if (choice == '1')
?? ?{
?? ??? ?do {
?? ??? ??? ?cout << "Please input the new telephone number:";
?? ??? ??? ?getline(cin, tele);
?? ??? ?} while (is_same_student_tele(tele));
?? ??? ?do {
?? ??? ??? ?cout << "Please input the new address:";
?? ??? ??? ?getline(cin, addr);
?? ??? ?} while (is_same_student_addr(addr));
?? ??? ?a[n].change(a[n].get_id(), a[n].get_year(), a[n].get_name(), a[n].get_pass(), a[n].get_gend(), tele, addr);
?? ??? ?ofstream outfile("student.txt");
?? ??? ?outfile.close();
?? ??? ?for (i = 0; i < l; i++)
?? ??? ??? ?a[i].write();
?? ??? ?cout << "The information has been changed:" << endl;
?? ??? ?a[n].display();
?? ??? ?system("pause");
?? ?}
?? ?else if (choice == '2')
?? ?{
?? ??? ?cout << "Please input the new password.";
?? ??? ?getline(cin, pass);
?? ??? ?a[n].change(a[n].get_id(), a[n].get_year(), a[n].get_name(), pass, a[n].get_gend(), a[n].get_tele(), a[n].get_addr());
?? ??? ?ofstream outfile("student.txt");
?? ??? ?outfile.close();
?? ??? ?for (i = 0; i < l; i++)
?? ??? ??? ?a[i].write();
?? ??? ?cout << "The password has been changed." << endl;
?? ??? ?system("pause");
?? ?}
}
void can_open(Book a)
{
?? ?if (!a.canopen())
?? ?{
?? ??? ?cout << endl << "The file cannot open.";
?? ??? ?cout << endl << "You have to restart the program to repair the error.";
?? ??? ?cout << endl << "Press enter to exit." << endl;
?? ??? ?system("pause");
?? ??? ?exit(0);
?? ?}
}
void can_open(Student a)
{
?? ?if (!a.canopen())
?? ?{
?? ??? ?cout << endl << "The file cannot open.";
?? ??? ?cout << endl << "You have to restart the program to repair the error.";
?? ??? ?cout << endl << "Press enter to exit." << endl;
?? ??? ?system("pause");
?? ??? ?exit(0);
?? ?}
}
bool is_same_student_name(string n)
{
?? ?int i;
?? ?bool success = 0;
?? ?Student a[999];
?? ?Student s;
?? ?for (i = 0; i < s.length(); i++)
?? ?{
?? ??? ?a[i].read(i);
?? ??? ?if (a[i].get_name() == n)
?? ??? ?{
?? ??? ??? ?cout << "There exist the same name." << endl;
?? ??? ??? ?success = 1;
?? ??? ?}
?? ?}
?? ?return success;
}
bool is_same_student_tele(string n)
{
?? ?int i;
?? ?bool success = 0;
?? ?Student a[999];
?? ?Student s;
?? ?for (i = 0; i < s.length(); i++)
?? ?{
?? ??? ?a[i].read(i);
?? ??? ?if (a[i].get_tele() == n)
?? ??? ?{
?? ??? ??? ?cout << "There exist the same telephone number." << endl;
?? ??? ??? ?success = 1;
?? ??? ?}
?? ?}
?? ?return success;
}
bool is_same_student_addr(string n)
{
?? ?int i;
?? ?bool success = 0;
?? ?Student a[999];
?? ?Student s;
?? ?for (i = 0; i < s.length(); i++)
?? ?{
?? ??? ?a[i].read(i);
?? ??? ?if (a[i].get_addr() == n)
?? ??? ?{
?? ??? ??? ?cout << "There exist the same address." << endl;
?? ??? ??? ?success = 1;
?? ??? ?}
?? ?}
?? ?return success;
}
bool is_same_book_name(string n)
{
?? ?int i;
?? ?bool success = 0;
?? ?Book a[999];
?? ?Book c;
?? ?for (i = 0; i < c.length(); i++)
?? ?{
?? ??? ?a[i].read(i);
?? ??? ?if (a[i].get_name() == n)
?? ??? ?{
?? ??? ??? ?cout << "There exist the same name." << endl;
?? ??? ??? ?success = 1;
?? ??? ?}
?? ?}
?? ?return success;
}