请使用C++设计一个图书管理系统

好的，以下是一个简单的C++图书管理系统：

#include <iostream>
#include <string>
#include <vector>
#include <fstream>

using namespace std;

// 书籍信息结构体
struct Book {
    string name;        // 书名
    string author;      // 作者
    string publisher;   // 出版社
    string publishDate; // 出版日期
    string ISBN;        // ISBN号
    double price;       // 价格
};

// 读者信息结构体
struct Reader {
    string name;    // 姓名
    string gender;  // 性别
    int age;        // 年龄
    string contact; // 联系方式
};

// 借阅信息结构体
struct Borrow {
    string ISBN;        // ISBN号
    string readerName;  // 读者姓名
    string borrowDate;  // 借阅日期
    string returnDate;  // 归还日期
};

// 图书管理系统类
class Library {
public:
    // 添加书籍
    void addBook();
    // 添加读者
    void addReader();
    // 借阅书籍
    void borrowBook();
    // 归还书籍
    void returnBook();
    // 查询书籍
    void searchBook();
    // 查询读者
    void searchReader();
    // 查询借阅信息
    void searchBorrow();
private:
    vector<Book> books;         // 书籍信息
    vector<Reader> readers;     // 读者信息
    vector<Borrow> borrows;     // 借阅信息
    string bookFile = "books.txt";      // 书籍信息存储文件
    string readerFile = "readers.txt";  // 读者信息存储文件
    string borrowFile = "borrows.txt";  // 借阅信息存储文件
};

// 添加书籍
void Library::addBook() {
    // 输入书籍信息
    Book newBook;
    cout << "请输入书籍信息：" << endl;
    cout << "书名：";
    getline(cin, newBook.name);
    cout << "作者：";
    getline(cin, newBook.author);
    cout << "出版社：";
    getline(cin, newBook.publisher);
    cout << "出版日期：";
    getline(cin, newBook.publishDate);
    cout << "ISBN号：";
    getline(cin, newBook.ISBN);
    cout << "价格：";
    cin >> newBook.price;
    cin.ignore();   // 忽略换行符

    // 将新书籍信息添加到 books 数组中
    books.push_back(newBook);

    // 将新书籍信息写入文件中
    ofstream fout(bookFile, ios::app);
    fout << newBook.name << "," << newBook.author << "," << newBook.publisher
         << "," << newBook.publishDate << "," << newBook.ISBN << "," << newBook.price << endl;
    fout.close();

    cout << "添加书籍成功！" << endl;
}

// 添加读者
void Library::addReader() {
    // 输入读者信息
    Reader newReader;
    cout << "请输入读者信息：" << endl;
    cout << "姓名：";
    getline(cin, newReader.name);
    cout << "性别：";
    getline(cin, newReader.gender);
    cout << "年龄：";
    cin >> newReader.age;
    cin.ignore();   // 忽略换行符
    cout << "联系方式：";
    getline(cin, newReader.contact);

    // 将新读者信息添加到 readers 数组中
    readers.push_back(newReader);

    // 将新读者信息写入文件中
    ofstream fout(readerFile, ios::app);
    fout << newReader.name << "," << newReader.gender << "," << newReader.age
         << "," << newReader.contact << endl;
    fout.close();

    cout << "添加读者成功！" << endl;
}

// 借阅书籍
void Library::borrowBook() {
    // 输入借阅信息
    Borrow newBorrow;
    cout << "请输入借阅信息：" << endl;
    cout << "ISBN号：";
    getline(cin, newBorrow.ISBN);
    cout << "读者姓名：";
    getline(cin, newBorrow.readerName);
    cout << "借阅日期：";
    getline(cin, newBorrow.borrowDate);
    cout << "归还日期：";
    getline(cin, newBorrow.returnDate);

    // 将新借阅信息添加到 borrows 数组中
    borrows.push_back(newBorrow);

    // 将新借阅信息写入文件中
    ofstream fout(borrowFile, ios::app);
    fout << newBorrow.ISBN << "," << newBorrow.readerName << ","
         << newBorrow.borrowDate << "," << newBorrow.returnDate << endl;
    fout.close();

    cout << "借阅成功！" << endl;
}

// 归还书籍
void Library::returnBook() {
    // 输入借阅信息
    Borrow returnBorrow;
    cout << "请输入归还信息：" << endl;
    cout << "ISBN号：";
    getline(cin, returnBorrow.ISBN);
    cout << "读者姓名：";
    getline(cin, returnBorrow.readerName);

    // 查找借阅信息
    int index = -1;
    for (int i = 0; i < borrows.size(); i++) {
        if (borrows[i].ISBN == returnBorrow.ISBN && borrows[i].readerName == returnBorrow.readerName) {
            index = i;
            break;
        }
    }

    if (index == -1) {
        cout << "未找到借阅信息！" << endl;
        return;
    }

    // 更新借阅信息
    string returnDate;
    cout << "请输入归还日期：";
    getline(cin, returnDate);
    borrows[index].returnDate = returnDate;

    // 将借阅信息更新到文件中
    ofstream fout(borrowFile);
    for (int i = 0; i < borrows.size(); i++) {
        fout << borrows[i].ISBN << "," << borrows[i].readerName << ","
             << borrows[i].borrowDate << "," << borrows[i].returnDate << endl;
    }
    fout.close();

    cout << "归还成功！" << endl;
}

// 查询书籍
void Library::searchBook() {
    string keyword;
    cout << "请输入书名、作者、ISBN号等关键字：";
    getline(cin, keyword);

    cout << "查询结果：" << endl;
    for (int i = 0; i < books.size(); i++) {
        if (books[i].name.find(keyword) != string::npos ||
            books[i].author.find(keyword) != string::npos ||
            books[i].ISBN.find(keyword) != string::npos) {
            cout << "书名：" << books[i].name << endl;
            cout << "作者：" << books[i].author << endl;
            cout << "出版社：" << books[i].publisher << endl;
            cout << "出版日期：" << books[i].publishDate << endl;
            cout << "ISBN号：" << books[i].ISBN << endl;
            cout << "价格：" << books[i].price << endl;
            cout << endl;
        }
    }
}

// 查询读者
void Library::searchReader() {
    string keyword;
    cout << "请输入姓名、联系方式等关键字：";
    getline(cin, keyword);

    cout << "查询结果：" << endl;
    for (int i = 0; i < readers.size(); i++) {
        if (readers[i].name.find(keyword) != string::npos ||
            readers[i].contact.find(keyword) != string::npos) {
            cout << "姓名：" << readers[i].name << endl;
            cout << "性别：" << readers[i].gender << endl;
            cout << "年龄：" << readers[i].age << endl;
            cout << "联系方式：" << readers[i].contact << endl;
            cout << endl;
        }
    }
}

// 查询借阅信息
void Library::searchBorrow() {
    string keyword;
    cout << "请输入读者姓名或ISBN号：";
    getline(cin, keyword);

    cout << "查询结果：" << endl;
    for (int i = 0; i < borrows.size(); i++) {
        if (borrows[i].readerName.find(keyword) != string::npos ||
            borrows[i].ISBN.find(keyword) != string::npos) {
            cout << "ISBN号：" << borrows[i].ISBN << endl;
            cout << "读者姓名：" << borrows[i].readerName << endl;
            cout << "借阅日期：" << borrows[i].borrowDate << endl;
            cout << "归还日期：" << borrows[i].returnDate << endl;
            cout << endl;
        }
    }
}

// 主函数
int main() {
    Library lib;
    int choice;
    while (true) {
        cout << "请选择操作：" << endl;
        cout << "1. 添加书籍" << endl;
        cout << "2. 添加读者" << endl;
        cout << "3. 借阅书籍" << endl;
        cout << "4. 归还书籍" << endl;
        cout << "5. 查询书籍" << endl;
        cout << "6. 查询读者" << endl;
        cout << "7. 查询借阅信息" << endl;
        cout << "0. 退出" << endl;
        cin >> choice;
        cin.ignore();   // 忽略换行符
        switch (choice) {
        case 0:
            return 0;
        case 1:
            lib.addBook();
            break;
        case 2:
            lib.addReader();
            break;
        case 3:
            lib.borrowBook();
            break;
        case 4:
            lib.returnBook();
            break;
        case 5:
            lib.searchBook();
            break;
        case 6:
            lib.searchReader();
            break;
        case 7:
            lib.searchBorrow();
            break;
        default:
            cout << "无效操作，请重新选择！" << endl;
            break;
        }
    }
    return 0;
}

以上代码实现了一个基本的图书管理系统，包括添加书籍、添加读者、借阅书籍、归还书籍、查询书籍、查询读者和查询借阅信息等功能。程序使用了文件存储书籍、读者和借阅信息，每个信息单独存储在一个文件中，方便数据的管理和维护。