C++实现图书管理系统简易版的方法

本文小编为大家详细介绍"C++实现图书管理系统简易版的方法"，内容详细，步骤清晰，细节处理妥当，希望这篇"C++实现图书管理系统简易版的方法"文章能帮助大家解决疑惑，下面跟着小编的思路慢慢深入，一起来学习新知识吧。

包括管理员端和学生端，可以对图书进行借阅，归还，还可以修改账号登陆密码等

#include#include#include#include#include#include#include#include#include#include#include#include//stringstream要使用到的头文件#define STUDENT_FILE "student_text.txt"#define BOOK_FILE "book_text.txt"#define CLASS_FILE "class.txt"#define MAX 1000#define MIN 100using namespace std;class Student;class Book;class Clazz;void initialize();//初始化void Manager_Menu();void Student_Menu();void existSystem();  //退出图书管理系统 void show_book_base();string input_password();//不可见输入密码int student_id_exist(int id);//查找用户是否存在int manager_id_exist(int id);int book_id_exist(int id);//查找书籍是否存在int class_id_exist(int id);int random_id(); //产生随机图书编号void book_find();void load_information();void update_information();void regist_windows();void regist_manager();void regist_student();bool student_cmp(Student a, Student b);bool class_cmp(Clazz a, Clazz b);bool book_cmp(Book a, Book b);class Book{    int book_id;                    //书籍编号    string book_name;               //书籍名称    int book_total_num;             //该类书籍总数    string book_author;             //书籍作者    string book_type;               //书籍分类    string book_present;            //书籍简介    int book_student_len;           //每种书共有几人选    int student_id[MIN];       //借阅该书籍的学生学号    string student_name[MIN];  //借阅该书籍的学生姓名public:    Book()    {        book_id = -1;        book_total_num = 0;        book_student_len = 0;        book_type = "";        book_present = "";        memset(student_id, 0, MIN);        for (int i = 0; i < MIN; i++)        {            student_name[i] = "";        }    }    void set_book_name(string book_name)    {        this->book_name = book_name;    }    void set_book_author(string book_author)    {        this->book_author = book_author;    }    void set_book_type(string book_type)    {        this->book_type = book_type;    }    void set_book_total_num(int book_total_num)    {        this->book_total_num = book_total_num;    }    void set_book_id(int book_id)    {        this->book_id = book_id;    }    int get_book_id()    {        return book_id;    }    void set_book_information(int book_id, string book_name, int book_total_num, string book_author, string book_type)    {        set_book_id(book_id);        set_book_name(book_name);        set_book_author(book_author);        set_book_type(book_type);        set_book_total_num(book_total_num);        //set_book_present(book_present);    }    void set_book_present(string book_present)    {        this->book_present = book_present;    }    string& get_book_present()    {        return book_present;    }    void show_book_information();    friend int book_id_exist(int id);    friend void show_book_base();    friend class Student;    friend class Manager;    friend void initialize();    friend void load_information();    friend void update_information();};Book book[MAX];int book_len = 0;class User{protected:    int id;    string name;    string password;    int mark;public:    User()    {        id = -1;        mark = 0;        name = "";        password = "";    }    void password_update();    virtual void book_insert()=0;    virtual void book_delete()=0;    friend void initialize();    void set_id(int id)    {        this->id = id;    }    void set_name(string name)    {        this->name = name;    }    void set_mark(int mark)    {        this->mark = mark;    }    void set_password(string password)    {        this->password = password;    }    int get_id()    {        return  id;    }    int get_mark()    {        return this->mark;    }    string get_name()    {        return name;    }    string get_password()    {        return password;    }};class Student:public User{    int student_grade;    //入学年份--年级    int class_id;    string student_gender;    int student_book_len;//借阅书籍总数public:    Student()    {        id = -1;  //id为-1时表示该账户无效        class_id = -1;        name = "";        student_gender = "";        student_grade = -1;        student_book_len = 0;    }    Student operator = (const Student& p);    void set_class_id(int id)    {        class_id = id;    }    void set_student_grade(int student_grade)    {        this->student_grade = student_grade;    }    void set_student_gender(string student_gender)    {        this->student_gender = student_gender;    }    int get_class_id()    {        return class_id;    }    int get_student_grade()    {        return student_grade;    }    string get_student_gender()    {        return  student_gender;    }        //学生    void book_insert();    void student_information_view();    void book_delete();    void student_information_update();    //学生修改账号密码        void show_self();    void student_windows();     friend void eroll_windows();     friend class Manager;    friend void load_information();    friend void update_information();    friend bool student_cmp(Student a,Student b);};Student student[MAX];int student_len = 0;class Manager :public User{public:    Manager()    {        id = -1;        mark = 0;        name = "";        password = "";    }    Manager(int id,int mark,string name,string password)    {        this->id =id;        this->mark = mark;        this->name = name;        this->password = password;    }    Manager operator = (const Manager& p);    //管理员对学生账号的管理    void student_insert();    void student_delete();    void student_view();     //管理员对书籍的管理    void book_insert();    void book_delete();    void book_view();    void book_update();    //班级    void class_insert();    void class_update();    void class_view();    void class_delete();    void manager_windows();    void manager_insert();        friend void load_information();    friend void update_information();};Manager manager[MIN];int manager_len = 0;class Clazz{    int class_id;    string class_name;    string teacher_name;    int student_len;public:    Clazz()    {        class_id = -1;        class_name = "";        teacher_name = "";        student_len = 0;    }    int get_class_id()    {        return class_id;    }    string get_class_name()    {        return class_name;    }    string get_teacher_name()    {        return teacher_name;    }    void set_class_id(int id)    {        this->class_id =id;    }    void set_class_name(string name)    {        this->class_name = name;    }    void set_teacher_name(string name)    {        this->teacher_name = name;    }        friend int class_id_exist(int id);    friend void load_information();    friend void update_information();};Clazz clazz[MIN];int class_len = 0; int main(){    initialize();    //登录    regist_windows();    system("pause");    return 0;} void initialize(){    system("title 图书信息管理系统");    system("color f0");    system("mode con cols=90 lines=38");    srand((int)time(0));     load_information();    Manager p1;    p1.set_id(111111);    p1.set_name("张晖");    p1.set_password("111111");    manager[0]=p1; manager_len++;    Manager p2(222222,1, "李四", "222222");    manager[1]=p2; manager_len++;}void Manager_Menu(){     cout << " ________________________________________________________________________________________" << endl;    cout << " |                             图书管理管理系统                                         |" << endl;    cout << " |______________________________________________________________________________________|" << endl;    cout << " |              1.增加学生信息              |              13.修改登录密码              |" << endl;    cout << " |              2.查看学生信息              |              14.退出当前账号              |" << endl;    cout << " |              3.删除学生信息              |              0.退出管理系统               |" << endl;    cout << " |__________________________________________|___________________________________________|" << endl;    cout << " |              4.增加书籍信息              |              8.增加班级信息               |" << endl;    cout << " |              5.查看书籍信息              |              9.查看班级信息               |" << endl;    cout << " |              6.修改书籍信息              |              10.修改班级信息              |" << endl;    cout << " |              7.删除书籍信息              |              11.删除班级信息              |" << endl;    cout << " |                                          |              12.增加管理员                |" << endl;    cout << " |__________________________________________|___________________________________________|" << endl;    cout << endl;}void Student_Menu(){    cout << "           ______________________________________________" << endl;    cout << "           |                学生图书系统                |" << endl;    cout << "           |____________________________________________|" << endl;    cout << "           |               1.选择借阅书籍               |" << endl;    cout << "           |               2.查找书籍信息               |" << endl;    cout << "           |               3.归还借阅书籍               |" << endl;    cout << "           |               4.查询个人信息               |" << endl;    cout << "           |____________________________________________|" << endl;    cout << "           |               5.修改个人信息               |" << endl;    cout << "           |               6.修改登录密码               |" << endl;    cout << "           |               7.退出当前账号               |" << endl;    cout << "           |               0.退出管理系统               |" << endl;    cout << "           |____________________________________________|" << endl;    cout << endl;}void Manager::manager_windows(){    while (true)    {        int choice = 0;        Manager_Menu();        cout << "\t\t请输入您的选择：" << endl;        cout << "          ";        cin >> choice;        switch (choice)        {        case 0://退出        {            existSystem();            break;        }        case 1://添加        {            student_insert();            break;        }        case 2://显示        {            student_view();            break;        }        case 3://删除        {            student_delete();            break;        }        case 4:        {            book_insert();            break;        }        case 5:        {            book_view();//book_find();            break;        }        case 6://查找        {            book_update();            break;        }        case 7:        {            book_delete();            break;        }        case 8:        {            class_insert();            break;        }        case 9:        {            class_view();            break;        }        case 10://查找        {            class_update();            break;        }        case 11:        {            class_delete();            break;        }        case 12:        {            manager_insert();            break;        }        case 13:        {            password_update();            break;        }        case 14://回到登录界面        {            system("cls");            update_information();            regist_windows();            break;        }        default:        {            cout << "没有该选项!" << endl;            system("cls");            break;        }        }    }}void Student::student_windows(){     while (true)    {        int choice = 0;        Student_Menu();        cout << "\t\t请输入您的选择：" << endl;        cout << "         ";        cin >> choice;        switch (choice)        {        case 0://退出        {            existSystem();            break;        }        case 1://添加        {            book_insert();            break;        }        case 2:        {            book_find();            break;        }        case 3:        {            book_delete();            break;        }        case 4:        {            student_information_view();            break;        }        case 5:        {            student_information_update();            break;        }        case 6:        {            password_update();            break;        }        case 7://回到登录界面        {            system("cls");            update_information();            regist_windows();            break;        }        default:        {            cout << "没有该选项" << endl;            system("cls");            break;        }        }    }}void regist_windows(){    int select = 0;    cout << "\t\t1.管理员登录" << endl;    cout << "\t\t2.学生登录" << endl;    cin >> select;    system("cls");    if (select == 1)    {        regist_manager();    }    else if (select == 2)    {        regist_student();    }    else    {        cout << "该选项不存在！请选择1或2！" << endl;    }}void regist_manager(){    cout << "\t用户名：";    int temp_user_id = -1; cin >> temp_user_id; cout << endl;    cout << "\t密码：";    string temp_password;  temp_password = input_password();    int flag = 0;    int position = manager_id_exist(temp_user_id);    if (position == -1)    {        cout << "该用户不存在！" << endl;        regist_manager();     }    else if (manager[position].get_password() == temp_password)    {        system("cls");        while (true)        {            manager[position].manager_windows();        }    }    else    {        cout << "\t\t用户名或密码错误" << endl << endl;        regist_manager();    }    system("pause");    system("cls");}void regist_student(){    int temp_user_id = 0;    string temp_password;    cout << "\t用户名：";    cin >> temp_user_id;    cout << endl;    cout << "\t密码：";    temp_password = input_password();    int flag = 0;    int position = student_id_exist(temp_user_id);    if (position == -1)    {        cout << "\t该用户不存在！" << endl;        regist_student();    }    else if (student[position].get_password() == temp_password)    {        system("cls");        while (true)        {            student[position].student_windows();        }    }    else    {        cout << "\t\t用户名或密码错误" << endl << endl;        regist_student();    }    system("pause");    system("cls");}void Book::show_book_information(){    cout << "-------------------------------------------------------------------------------------\n";    cout << " 书名\t\t\t类型\t\t\t\t作者\n";    cout << book_name << "\t\t\t" << book_type << "\t\t\t" << book_author << endl;    cout << "-------------------------------------------------------------------------------------\n";    cout << " 总数\t\t\t剩余量\n";    cout << book_total_num << "\t\t\t" << (book_total_num - book_student_len) << endl;    cout << "-------------------------------------------------------------------------------------\n";    cout << "\t\t\t小说简介\n";    cout << book_present << endl;    cout << "-------------------------------------------------------------------------------------\n";}void User::password_update(){    int flag = 0;    while (true)    {        cout << "请输入旧密码：";        string last_password, new_password1, new_password2;        last_password = input_password();        if (last_password == password)        {            cout << "请输入新密码(大于等于6位)："; new_password1 = input_password();            cout << "请再次输入新密码：";         new_password2 = input_password();            if (new_password1 == new_password2)            {                if ((new_password1.size() >= 6) && (new_password1.size() <= 13))                {                    this->password = new_password1;                    cout << "密码修改成功！" << endl;                    break;                }                else                {                    cout << "密码应大于等于6位！修改失败！" << endl;                }            }            else            {                cout << "两次密码不一致！请重新输入！" << endl;            }        }        else        {            flag++;            if (flag <= 3)            {                cout << "旧密码错误！" << endl;            }            else            {                cout << "密码多次输入错误！返回菜单界面！";                break;            }        }    }    system("pause");    system("cls");} Manager  Manager::operator = (const Manager& p){    this->id = p.id;    this->mark = p.mark;    this->name = p.name;    this->password = p.password;    return *this;}void Manager::student_insert(){    if (student_len > MAX)    {        cout << "信息系统已满，无法添加!" << endl;        return;    }    else    {        Student temp_student;        cout << "请输入学号：" << endl;        int temp_id; cin >> temp_id;        cout << "请输入姓名：" << endl;        string temp_name; cin >> temp_name;        cout << "请输入权限：" << endl;        cout << "1.普通用户权限" << endl;        cout << "2.高级用户权限" << endl;        int temp_mark; cin >> temp_mark;        temp_student.set_mark(temp_mark);        string temp_student_gender;        while (true)        {            cout << "请选择性别：" << endl;            cout << "1.女\n2.男\n";            int choice = 0; cin >> choice;            if (choice == 1)            {                temp_student_gender = "女"; break;            }            else if (choice == 2)            {                temp_student_gender = "男"; break;            }            else            {                cout << "没有该选项！请重新选择！\n";            }        }        int temp_student_grade;        while (true)        {            cout << "请输入年级（入学年份）：" << endl;            cout << "1.2018\n2.2019\n3.2020\n4.2021\n";            int choice = 0; cin >> choice;            if (choice == 1)            {                temp_student_grade = 2018; break;            }            else if (choice == 2)            {                temp_student_grade = 2019; break;            }            else if (choice == 3)            {                temp_student_grade = 2020; break;            }            else if (choice == 2)            {                temp_student_grade = 2021; break;            }            else            {                cout << "没有该选项！请重新选择！\n";            }        }        cout << "\t\t班级信息如下\n";        for (int i = 0; i < class_len; i++)            cout << clazz[i].get_class_id() << "\t\t" << clazz[i].get_class_name() << endl;        while (1)        {            cout << "请输入班级编号\n";            int temp_id = 0; cin >> temp_id;            if (class_id_exist(temp_id) != -1)            {                temp_student.set_class_id(temp_id);                break;            }            else            {                cout << "该班级编号不存在！\n";            }        }         string temp_password;        stringstream transform;        transform << temp_id; transform >> temp_password;        temp_student.set_password(temp_password);        temp_student.set_id(temp_id);        temp_student.set_student_grade(temp_student_grade);        temp_student.set_name(temp_name);        temp_student.set_student_gender(temp_student_gender);        student[student_len] = temp_student;       /* while (1)        {            cout << "请设置您的密码：" << endl;            temp_password1 = input_password();            temp_password2 = input_password();            if (temp_password1 == temp_password2)            {                student[student_len].password = temp_password1;                student_len++;                break;            }            else            {                cout << "两次密码不一致！请重新设置密码！" << endl;            }        }*/        student_len++;        cout << "学生信息添加成功！" << endl;        sort(student, student + student_len, student_cmp);    }    system("pause");    system("cls");}void Manager::student_view(){    cout << "\t\t1.查询单个账号信息" << endl;    cout << "\t\t2.查看所有账号信息" << endl;    int choice; cin >> choice;    if (choice == 1)    {        cout << "\t\t请输入查询账号：" << endl;        int id; cin >> id;        int pos = student_id_exist(id);        if (pos == -1)        {            cout << "\t\t该账号不存在！" << endl;        }        else        {            student[pos].show_self();        }    }    else    {        if (student_len == 0)        {            cout << "当前记录为空" << endl;        }        else        {            cout << "序号：\t姓名：\t学号： \t年级： \t性别\n";            for (int i = 0; i < student_len; i++)            {                cout << i + 1 << "\t\t";                cout << student[i].name << "\t\t" << student[i].id << "\t\t";                if (student[i].student_book_len == 0)                {                    cout << "未借阅书籍";                }                else                {                    for (int j = 0; j < book_len; j++)                    {                        for (int k = 0; k < book[j].book_total_num; k++)                        {                            if (book[j].student_name[k] == student[i].name)                                cout << book[j].book_id << "\t\t" << book[j].book_name << endl;;                        }                    }                }                cout << endl;            }        }    }    system("pause");    system("cls");}void Manager::student_delete(){    cout << "请输入您要删除的学生账号：" << endl;    int temp_id;    cin >> temp_id;    int position = student_id_exist(temp_id);    if (position != -1)    {        for (int i = position; i < student_len - 1; i++)        {            student[i] = student[i + 1];        }        student_len--;        cout << "删除成功" << endl;    }    else    {        cout << "该学生账号不存在！" << endl;    }    system("pause");    system("cls");}void Manager::book_insert(){    int temp_book_id;    string temp_book_name;    show_book_base();    //cout << "请输入想增加的书籍编号：" << endl;    cout << "书籍编号由系统自动生成!" << endl;    temp_book_id = random_id();    cout << "请输入想增加的书籍名称：" << endl;    cin >> temp_book_name;    cout << "请输入书籍数量：" << endl;    int temp_book_len; cin >> temp_book_len;    cout << "请输入书籍作者：" << endl;    string temp_book_author; cin >> temp_book_author;    cout << "请输入书籍分类：" << endl;    string temp_book_type; cin >> temp_book_type;    cout << "请输入书籍简介：" << endl;    string temp_book_present; cin >> temp_book_present;    book[book_len].set_book_information(temp_book_id, temp_book_name, temp_book_len, temp_book_author, temp_book_type);    book[book_len].set_book_present(temp_book_present);    book_len++;    cout << "书籍信息添加成功！" << endl;    sort(book, book + book_len, book_cmp);    system("pause");    system("cls");}void Manager::book_delete(){    int temp_book_id;    show_book_base();    cout << "请输入想删除的书籍id号：" << endl;    cin >> temp_book_id;    if (book_id_exist(temp_book_id) == -1)    {        cout << "该书籍不存在!" << endl;    }    else    {        for (int i = 0; i < book_len - 1; i++)        {            book[i] = book[i + 1];        }        book_len--;        cout << "书籍信息删除成功！" << endl;    }    system("pause");    system("cls");}void Manager::book_update(){    show_book_base();    cout << "请输入想修改的书籍编号：" << endl;    int temp_book_id;  cin >> temp_book_id;    cout << "请选择你要修改的书籍信息" << endl;    cout << "1--修改书籍名称" << endl;    cout << "2--修改书籍总数" << endl;    cout << "3--修改书籍作者" << endl;    cout << "4--修改书籍分类" << endl;    cout << "5--修改书籍简介" << endl;    cout << "0--返回菜单" << endl;    int choice = 0; cin >> choice;    switch (choice)    {    case 0: break;    case 1:    {        cout << "请输入书籍名称：" << endl;        string temp_book_name; cin >> temp_book_name;        book[book_len].set_book_name(temp_book_name);        cout << "修改成功\n";        break;    }    case 2:    {        cout << "请输入书籍总数：" << endl;        int temp_book_len; cin >> temp_book_len;        book[book_len].set_book_total_num(temp_book_len);        break;    }    case 3:    {        cout << "请输入书籍作者：" << endl;        string temp_book_author; cin >> temp_book_author;        book[book_len].set_book_author(temp_book_author);        break;    }    case 4:    {        cout << "请输入书籍分类：" << endl;        int temp_book_type; cin >> temp_book_type;        book[book_len].book_type = temp_book_type;        break;    }case 5:    {        cout << "请输入书籍简介：" << endl;        string temp_book_present; cin >> temp_book_present;        book[book_len].book_present = temp_book_present;        break;    }    default:    {        cout << "没有该选项！" << endl; break;    }    }    system("pause");    system("cls"); }void Manager::book_view(){    if (book_len == 0)    {        cout << "无借阅信息！" << endl;    }    for (int i = 0; i < book_len; i++)    {        cout << "书籍id号：" << book[i].book_id << "\t书籍名：" << book[i].book_name            << "\t作者:" << book[i].book_author            << "\t书籍剩余数:" << (book[i].book_total_num - book[i].book_student_len)            << "\t书籍总数:" << book[i].book_total_num << endl;        if (book[i].book_student_len == 0)        {            cout << "\t\t空！" << endl;        }        else        {            cout << "学号\t\t" << "姓名" << endl;            for (int j = 0; j < book[i].book_student_len; j++)            {                cout << book[j].book_id << "\t" << book[j].book_name << endl;            }        }        cout << endl;    }    cout << "\t如果您需要查询书籍详细信息，请输入1；不需要则输入0\n";    int ch = 0; cin >> ch;    if (ch==1)        book_find();    system("pause");    system("cls");}void Manager::class_insert(){    int temp_id;    string temp_name;    cout << "请输入想增加的班级编号：" << endl;    cin >> temp_id;    clazz[class_len].set_class_id(temp_id);    cout << "请输入想增加的班级名称：" << endl;    cin >> temp_name;    clazz[class_len].set_class_name(temp_name);    cout << "请输入想增加的班主任姓名：" << endl;    string temp_teacher_name; cin >> temp_teacher_name;    clazz[class_len].set_teacher_name(temp_teacher_name);    class_len++;    cout << "班级信息添加成功！" << endl;    sort(clazz, clazz + class_len, class_cmp);    system("pause");    system("cls");}void Manager::class_delete(){    int temp_book_id;    cout << "班级编号\t\t\t班级名称\n";    for (int i = 0; i < book_len; i++)        cout << clazz[i].get_class_id()<< "\t\t" << clazz[i].get_class_name () << endl;    cout << "请输入想删除的班级编号：" << endl;    cin >> temp_book_id;    if (class_id_exist(temp_book_id) == -1)    {        cout << "该班级不存在!" << endl;    }    else    {        for (int i = 0; i < class_len - 1; i++)        {            clazz[i] = clazz[i + 1];        }        class_len--;        cout << "班级信息删除成功！" << endl;    }    system("pause");    system("cls");}void Manager::class_update(){    class_view();    cout << "请输入想修改的班级编号：" << endl;    int temp_book_id;  cin >> temp_book_id;    cout << "请选择你要修改的班级信息" << endl;    cout << "1--修改班级名称" << endl;    cout << "2--修改班主任姓名" << endl;    cout << "0--返回菜单" << endl;    int choice = 0; cin >> choice;    switch (choice)    {    case 0: break;    case 1:    {        cout << "请输入班级名称：" << endl;        string temp_name; cin >> temp_name;        clazz[class_len].set_class_name(temp_name);        cout << "修改成功\n";        break;    }    case 2:    {        cout << "请输入班主任名称：" << endl;        string temp_teacher_name; cin >> temp_teacher_name;        clazz[class_len].set_teacher_name(temp_teacher_name);        cout << "修改成功\n";        break;    }    default:    {        cout << "没有该选项！" << endl; break;    }    }    system("pause");    system("cls"); }void Manager::class_view(){    if (class_len == 0)    {        cout << "无班级信息！" << endl;    }    else    {        cout << "\t\t班级信息如下" << endl;        cout << "班级编号\t\t班级名称\t\t班主任姓名" << endl;        for (int i = 0; i < class_len; i++)            cout << clazz[i].get_class_id() << setw(32) << clazz[i].get_class_name() << setw(26) << clazz[i].get_teacher_name() << endl;    }    system("pause");    system("cls");}void Manager::manager_insert(){    if (this->mark == 0)    {        cout << "\t\t权限不足！" << endl;    }    else    {        cout << "请输入账号：" << endl;        int temp_id; cin >> temp_id;        cout << "请输入姓名：" << endl;        string temp_name; cin >> temp_name;        cout << "请输入权限：" << endl;        cout << "1.普通管理员权限" << endl;        cout << "2.高级管理员权限" << endl;        int temp_mark; cin >> temp_mark;        cout << "密码默认为账号！" << endl;        string temp_password;        stringstream transform;        transform << temp_id; transform >> temp_password;        Manager temp(temp_id, temp_mark, temp_name, temp_password);        manager[manager_len] = temp;        manager_len++;    }    system("pause");    system("cls");} Student Student::operator = (const Student& p){    this->id = p.id;    this->name = p.name;    this->student_gender = p.student_gender;    this->student_grade = p.student_grade;    this->class_id = p.class_id;    this->student_book_len = p.student_book_len;    this->password = p.password;    return *this;}void Student::book_insert(){    cout << "可选书籍如下：" << endl;    show_book_base();    int temp_book_id;    cout << "请输入你要借阅的书籍编号：" << endl;    cin >> temp_book_id;    int position = book_id_exist(temp_book_id);    int count = book[position].book_student_len;    if (position == -1)    {        cout << "该书籍不存在！" << endl;    }    else    {        book[position].student_id[count] = this->id;        book[position].student_name[count] = this->name;        book[position].book_student_len++;        student_book_len++;        cout << "借阅成功！" << endl;    }    system("pause");    system("cls");}void Student::student_information_view(){    cout << "\t\t请输入查询账号：" << endl;    int id; cin >> id;    int pos =student_id_exist(id);    if (pos != student_id_exist(id))    {        cout << "\t\t您无查看他人账号权限！" << endl;    }    else    {        show_self();    }    system("pause");    system("cls");}void Student::student_information_update(){    cout << "请选择你要更改的信息：\n";    cout << "1.修改性别\n";    cout << "2.修改年级\n";    cout << "3.修改班级\n";    int choice; cin >> choice;    if (choice == 1)    {        cout << "1.男\n2.女\n";        int select; cin >> select;        if (select == 1)        {            this->student_gender = "男";            cout << "修改成功！\n";        }        else if (select == 1)        {            this->student_gender = "女";            cout << "修改成功！\n";        }        else            cout << "没有该选项！\n";    }    else if (choice == 2)    {        cout << "1.2018\n2.2019\n3.2020\n4.2021\n";        int select; cin >> select;        if (select == 1)        {            this->student_grade = 2018;            cout << "修改成功！\n";        }        else if (select == 2)        {            this->student_grade = 2019;            cout << "修改成功！\n";        }        else if (select == 3)        {            this->student_grade = 2020; cout << "修改成功！\n";        }        else if (select == 4)        {            this->student_grade = 2021; cout << "修改成功！\n";        }        else            cout << "没有该选项！\n";    }    else if(choice == 3)    {        cout << "\t\t班级信息如下" << endl;        cout << "班级编号\t\t班级名称\t\t班主任姓名" << endl;        for (int i = 0; i < class_len; i++)            cout << clazz[i].get_class_id() << "\t\t" << clazz[i].get_class_name() << "\t\t" << clazz[i].get_teacher_name() << endl;        while (1)        {            cout << "\t\t请输入你选择的班级编号\n" << endl;            int select; cin >> select;            if (class_id_exist(select) != -1)            {                int temp_id; cin >> temp_id;                this->class_id = temp_id;                break;            }            else            {                cout << "\t\t该班级编号不存在！\n";            }        }    }    else    {        cout << "该选项不存在！\n";    }    system("pause");    system("cls");}void Student::book_delete(){    cout << "您的已选书籍如下：" << endl;    if (student_book_len == 0)    {        cout << "空！" << endl;    }    else    {        cout << "序号\t\t书籍名称\t\t书籍编号" << endl;;        for (int i = 0; i < book_len; i++)        {            for (int j = 0; j < book[i].book_student_len; j++)            {                if (book[i].student_id[j] == this->id)                {                    cout << i + 1 << "\t\t" << book[i].book_name << "\t\t\t" << book[i].book_id << endl;                }            }        }    }    cout << endl << "请输入您想退还的书籍编号：" << endl;    int temp_book_id;  cin >> temp_book_id;    int book_position = book_id_exist(temp_book_id);    if (book_position == -1)    {        cout << "该书籍不存在！" << endl;    }    else    {        int student_position = -1;        for (int i = 0; i < book[book_position].book_student_len; i++)        {            if (book[book_position].student_id[i] == id)            {                student_position = i;                break;            }        }        if (student_position != -1)        {            for (int i = student_position; i < book[book_position].book_student_len - 1; i++)            {                book[book_position].student_id[i] = book[book_position].student_id[i + 1];                book[book_position].student_name[i] = book[book_position].student_name[i + 1];            }            book[book_position].book_student_len--;            student_book_len--;            cout << "书籍归还成功！" << endl;        }        else        {            cout << "你并未借阅过该书籍！" << endl;        }    }    system("pause");    system("cls");}void Student::show_self(){    cout << "\t\t账号信息如下：" << endl;    cout << "______________________________________________________________________________\n";    cout << " 姓名：" << this->name << "\t\t 学号：" << this->id << "\n";    cout << "______________________________________________________________________________\n";    cout << " 性别：" << this->student_gender << "\t\t 班级编号：" << this->class_id << "\n";    cout << "______________________________________________________________________________\n";    cout << " 书籍编号" << "\t\t书籍名称" << "\n";    cout << "______________________________________________________________________________\n";    if (this->student_book_len == 0)    {        cout << "\t\t暂未借阅书籍" << "\n";    }    else    {        for (int i = 0; i < book_len; i++)        {            for (int j = 0; j < book[i].book_student_len; j++)            {                if (book[i].student_id[j] == this->id)                {                    cout << "\t\t" << book[i].book_id                        << "\t\t" << book[i].book_name << "\n";                }            }        }    }    cout << "______________________________________________________________________________\n";}void book_find(){    cout << "请输入你要查找的书籍编号:" << endl;    int temp_book_id; cin >> temp_book_id;    int position = book_id_exist(temp_book_id);    if (position == -1)    {        cout << "该书籍编号不存在！查找失败！" << endl;    }    else    {        book[position].show_book_information();    }    system("pause");    system("cls");}void show_book_base(){    cout << "书籍id号：\t" << "书籍名称：" << endl;    for (int i = 0; i < book_len; i++)    {        cout << book[i].book_id << "\t\t" << book[i].book_name << endl;    }}int student_id_exist(int id)//二分查找{    int left = 0;    int right = student_len;    int mid = 0;    while (left < right)    {        mid = (left + right) / 2;        if (id == student[mid].get_id())            return mid;        if (id > student[mid].get_id())            left = mid + 1;        else if (id < student[mid].get_id())            right = mid;    }    return -1;}int manager_id_exist(int id){    for (int i = 0; i < manager_len; i++)    {        if (manager[i].get_id() == id)        {            return i;        }    }    return -1;}int book_id_exist(int id){    int left = 0;    int right = book_len;    int mid = 0;    while (left < right)    {        mid = (left + right) / 2;        if (id == book[mid].get_book_id())            return mid;        if (id > book[mid].get_book_id())            left = mid + 1;        else if (id < book[mid].get_book_id())            right = mid;    }    return -1;}int class_id_exist(int id){    int left = 0;    int right = class_len;    int mid = 0;    while (left < right)    {        mid = (left + right) / 2;        if (id == clazz[mid].get_class_id())            return mid;        if (id > clazz[mid].get_class_id())            left = mid + 1;        else if (id < clazz[mid].get_class_id())            right = mid;    }    return -1;}bool student_cmp(Student a, Student b){    return  a.id < b.id;}bool class_cmp(Clazz a, Clazz b){    return a.get_class_id() < b.get_class_id();}bool book_cmp(Book a, Book b){    return a.get_book_id() < b.get_book_id();}void existSystem(){    cout << "欢迎下次使用" << endl;    system("pause");    exit(0);}int random_id() //产生随机书籍编号{    int id;    for (int i = 0; i < 8; i++)    {        id = rand();    }    return id;}string input_password(){    char temp_password[20];    int len = 0; char key;    while ((key = _getch()) != '\r')//不可见输入    {        if (len < 12)        {            temp_password[len++] = key;            putchar('*');        }        else        {            cout << endl << endl;;            cout << "\t  密码过长" << endl;        }    }    temp_password[len] = '\0';//字符串结束标记：\0;    cout << endl;    return temp_password;}void load_information(){    ifstream fin;    fin.open(BOOK_FILE, ios::in);    if (fin.is_open() == false)    {        cout << "文件打开失败！" << endl;    }    fin >> book_len;     for (int i = 0; i < book_len; i++)    {                fin >> book[i].book_id >> book[i].book_name >> book[i].book_total_num            >> book[i].book_student_len >> book[i].book_author >> book[i].book_type            >> book[i].book_present;    }    fin.close();      fin.open(CLASS_FILE, ios::in);    if (fin.is_open() == false)    {        cout << "文件打开失败！" << endl;    }    fin >> class_len;     for (int i = 0; i < class_len; i++)    {        fin >> clazz[i].class_id >> clazz[i].class_name >> clazz[i].teacher_name;    }    fin.close();     fin.open(STUDENT_FILE, ios::in);    if (fin.is_open() == false)    {        cout << "文件打开失败！" << endl;    }    fin >> student_len;     for (int i = 0; i < student_len; i++)    {        fin >> student[i].id >> student[i].name >> student[i].mark>>student[i].student_grade>> student[i].class_id             >> student[i].student_gender >> student[i].password >> student[i].student_book_len;    }    fin.close();    sort(book, book + book_len, book_cmp);    sort(clazz, clazz + class_len, class_cmp);    sort(student, student + student_len, student_cmp);}void update_information(){    ofstream fou;    fou.open(BOOK_FILE, ios::out);    if (fou.is_open() == false)    {        cout << "文件打开失败！" << endl;    }    fou << book_len << endl;    for (int i = 0; i < book_len; i++)    {        fou << book[i].book_id << " " << book[i].book_name << " " << book[i].book_total_num << " " << book[i].book_student_len            << " " << book[i].book_author << " " << book[i].book_type << " " << book[i].book_present << endl;    }    fou.close();     fou.open(CLASS_FILE, ios::out);    if (fou.is_open() == false)    {        cout << "文件打开失败！" << endl;    }    fou << class_len << endl;    for (int i = 0; i < class_len; i++)    {        fou << clazz[i].class_id <<" "<< clazz[i].class_name <<" "<< clazz[i].teacher_name << endl;    }    fou.close();     fou.open(STUDENT_FILE, ios::out);    if (fou.is_open() == false)    {        cout << "文件打开失败！" << endl;    }    fou << student_len << endl;    for (int i = 0; i < student_len; i++)    {        fou << student[i].id << " " << student[i].name << " " << student[i].mark<<" "<
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