帮我用C++写一份较为完整的图书管理系统，能在控制台进行操作，需要设计基类，派生类，要能进行数据的保存和读取。

好的，我可以帮你设计一个简单的图书管理系统，以下是一些基本的类和功能：

1. 基类：Book（包含书名、作者、出版社、价格、ISBN 等信息）

2. 派生类：Reader（包含读者姓名、借阅书籍、归还日期等信息）

3. 功能：
- 添加图书
- 删除图书
- 修改图书信息
- 查询图书信息
- 借阅图书
- 归还图书
- 显示所有图书信息
- 保存数据到文件
- 从文件中读取数据

下面是代码实现：

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

class Book {
public:
    string name;
    string author;
    string publisher;
    double price;
    string ISBN;

    Book(string n, string a, string p, double pr, string i) :
        name(n), author(a), publisher(p), price(pr), ISBN(i) {}

    void display() {
        cout << "书名：" << name << endl;
        cout << "作者：" << author << endl;
        cout << "出版社：" << publisher << endl;
        cout << "价格：" << price << endl;
        cout << "ISBN：" << ISBN << endl;
    }
};

class Reader {
public:
    string name;
    string book;
    string date;

    Reader(string n, string b, string d) :
        name(n), book(b), date(d) {}
};

class Library {
public:
    vector<Book> books;
    vector<Reader> readers;

    void add_book() {
        string name, author, publisher, ISBN;
        double price;
        cout << "请输入书名：";
        cin >> name;
        cout << "请输入作者：";
        cin >> author;
        cout << "请输入出版社：";
        cin >> publisher;
        cout << "请输入价格：";
        cin >> price;
        cout << "请输入ISBN：";
        cin >> ISBN;
        Book b(name, author, publisher, price, ISBN);
        books.push_back(b);
        cout << "添加成功！" << endl;
    }

    void delete_book() {
        string name;
        cout << "请输入要删除的书名：";
        cin >> name;
        for (vector<Book>::iterator it = books.begin(); it != books.end(); it++) {
            if (it->name == name) {
                books.erase(it);
                cout << "删除成功！" << endl;
                return;
            }
        }
        cout << "没有找到该书！" << endl;
    }

    void modify_book() {
        string name;
        cout << "请输入要修改的书名：";
        cin >> name;
        for (vector<Book>::iterator it = books.begin(); it != books.end(); it++) {
            if (it->name == name) {
                cout << "请输入新的书名：";
                cin >> it->name;
                cout << "请输入新的作者：";
                cin >> it->author;
                cout << "请输入新的出版社：";
                cin >> it->publisher;
                cout << "请输入新的价格：";
                cin >> it->price;
                cout << "请输入新的ISBN：";
                cin >> it->ISBN;
                cout << "修改成功！" << endl;
                return;
            }
        }
        cout << "没有找到该书！" << endl;
    }

    void search_book() {
        string name;
        cout << "请输入要查询的书名：";
        cin >> name;
        for (vector<Book>::iterator it = books.begin(); it != books.end(); it++) {
            if (it->name == name) {
                it->display();
                return;
            }
        }
        cout << "没有找到该书！" << endl;
    }

    void borrow_book() {
        string name, book, date;
        cout << "请输入借阅者姓名：";
        cin >> name;
        cout << "请输入借阅书名：";
        cin >> book;
        cout << "请输入归还日期：";
        cin >> date;
        for (vector<Book>::iterator it = books.begin(); it != books.end(); it++) {
            if (it->name == book) {
                Reader r(name, book, date);
                readers.push_back(r);
                books.erase(it);
                cout << "借阅成功！" << endl;
                return;
            }
        }
        cout << "没有找到该书！" << endl;
    }

    void return_book() {
        string name, book;
        cout << "请输入归还者姓名：";
        cin >> name;
        cout << "请输入归还书名：";
        cin >> book;
        for (vector<Reader>::iterator it = readers.begin(); it != readers.end(); it++) {
            if (it->name == name && it->book == book) {
                for (vector<Book>::iterator it2 = books.begin(); it2 != books.end(); it2++) {
                    if (it2->name == book) {
                        books.push_back(*it2);
                        readers.erase(it);
                        cout << "归还成功！" << endl;
                        return;
                    }
                }
            }
        }
        cout << "没有找到该借阅记录！" << endl;
    }

    void display_books() {
        for (vector<Book>::iterator it = books.begin(); it != books.end(); it++) {
            it->display();
            cout << endl;
        }
    }

    void save_data() {
        ofstream fout("library.txt");
        for (vector<Book>::iterator it = books.begin(); it != books.end(); it++) {
            fout << it->name << " " << it->author << " " << it->publisher << " "
                << it->price << " " << it->ISBN << endl;
        }
        for (vector<Reader>::iterator it = readers.begin(); it != readers.end(); it++) {
            fout << it->name << " " << it->book << " " << it->date << endl;
        }
        fout.close();
        cout << "保存成功！" << endl;
    }

    void load_data() {
        ifstream fin("library.txt");
        string line;
        while (getline(fin, line)) {
            string name, author, publisher, ISBN;
            double price;
            istringstream iss(line);
            iss >> name >> author >> publisher >> price >> ISBN;
            Book b(name, author, publisher, price, ISBN);
            books.push_back(b);
        }
        while (getline(fin, line)) {
            string name, book, date;
            istringstream iss(line);
            iss >> name >> book >> date;
            Reader r(name, book, date);
            readers.push_back(r);
        }
        fin.close();
        cout << "加载成功！" << endl;
    }
};

int main() {
    Library lib;
    lib.load_data();
    while (true) {
        cout << "请选择操作：" << endl;
        cout << "1. 添加图书" << endl;
        cout << "2. 删除图书" << endl;
        cout << "3. 修改图书信息" << endl;
        cout << "4. 查询图书信息" << endl;
        cout << "5. 借阅图书" << endl;
        cout << "6. 归还图书" << endl;
        cout << "7. 显示所有图书信息" << endl;
        cout << "8. 保存数据" << endl;
        cout << "9. 退出" << endl;
        int choice;
        cin >> choice;
        switch (choice) {
        case 1:
            lib.add_book();
            break;
        case 2:
            lib.delete_book();
            break;
        case 3:
            lib.modify_book();
            break;
        case 4:
            lib.search_book();
            break;
        case 5:
            lib.borrow_book();
            break;
        case 6:
            lib.return_book();
            break;
        case 7:
            lib.display_books();
            break;
        case 8:
            lib.save_data();
            break;
        case 9:
            return 0;
        default:
            cout << "输入错误，请重新选择！" << endl;
        }
    }
    return 0;
}

以上就是一个简单的图书管理系统的实现，你可以根据自己的需求进行修改和扩展。