写一个图书管理系统c++代码

以下是一个简单的图书管理系统的 C++ 代码，实现了基本的图书添加、查询、修改和删除功能：

#include <iostream>
#include <vector>
#include <algorithm>
#include <string>

using namespace std;

// 图书类
class Book {
public:
    string name;        // 书名
    string author;      // 作者
    string publisher;   // 出版社
    int year;           // 出版年份
    int pages;          // 页数

    Book() {}
    Book(string n, string a, string p, int y, int pg) {
        name = n;
        author = a;
        publisher = p;
        year = y;
        pages = pg;
    }
};

// 图书管理系统类
class Library {
private:
    vector<Book> books;     // 图书列表

public:
    // 添加图书
    void addBook() {
        string name, author, publisher;
        int year, pages;

        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 << "请输入出版年份：";
        cin >> year;
        cout << "请输入页数：";
        cin >> pages;

        Book book(name, author, publisher, year, pages);
        books.push_back(book);
        cout << "添加成功！" << endl;
    }

    // 查询图书
    void searchBook() {
        string keyword;
        cout << "请输入查询关键字：";
        cin >> keyword;

        vector<Book>::iterator it;
        for (it = books.begin(); it != books.end(); it++) {
            Book book = *it;
            if (book.name.find(keyword) != string::npos || book.author.find(keyword) != string::npos || book.publisher.find(keyword) != string::npos) {
                cout << "书名：" << book.name << endl;
                cout << "作者：" << book.author << endl;
                cout << "出版社：" << book.publisher << endl;
                cout << "出版年份：" << book.year << endl;
                cout << "页数：" << book.pages << endl;
                cout << endl;
            }
        }
    }

    // 修改图书
    void modifyBook() {
        string name, author, publisher;
        int year, pages;

        cout << "请输入要修改的书名：";
        cin >> name;

        vector<Book>::iterator it;
        for (it = books.begin(); it != books.end(); it++) {
            Book& book = *it;
            if (book.name == name) {
                cout << "请输入新的书名：";
                cin >> book.name;
                cout << "请输入新的作者：";
                cin >> book.author;
                cout << "请输入新的出版社：";
                cin >> book.publisher;
                cout << "请输入新的出版年份：";
                cin >> book.year;
                cout << "请输入新的页数：";
                cin >> book.pages;

                cout << "修改成功！" << endl;
                return;
            }
        }

        cout << "未找到该书！" << endl;
    }

    // 删除图书
    void deleteBook() {
        string name;
        cout << "请输入要删除的书名：";
        cin >> name;

        vector<Book>::iterator it;
        for (it = books.begin(); it != books.end(); it++) {
            Book& book = *it;
            if (book.name == name) {
                books.erase(it);
                cout << "删除成功！" << endl;
                return;
            }
        }

        cout << "未找到该书！" << endl;
    }
};

int main() {
    Library lib;
    int choice;

    while (true) {
        cout << "请选择操作：" << endl;
        cout << "1.添加图书" << endl;
        cout << "2.查询图书" << endl;
        cout << "3.修改图书" << endl;
        cout << "4.删除图书" << endl;
        cout << "5.退出系统" << endl;
        cout << "请选择：";
        cin >> choice;

        switch (choice) {
            case 1:
                lib.addBook();
                break;
            case 2:
                lib.searchBook();
                break;
            case 3:
                lib.modifyBook();
                break;
            case 4:
                lib.deleteBook();
                break;
            case 5:
                cout << "谢谢使用！" << endl;
                return 0;
            default:
                cout << "无效操作！" << endl;
        }

        cout << endl;
    }

    return 0;
}

注意，这只是一个非常简单的图书管理系统，没有考虑到复杂的业务逻辑和数据持久化等问题。在实际应用中，可能需要更复杂的代码和更完善的设计来满足实际需求。