写一个图书管理系统c++，包括图书信息录入，修改，查询，删除

好的，这里是一个较为完整的图书管理系统的C++代码示例：

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

using namespace std;

class Book {
public:
    string title;
    string author;
    string publisher;
    int year;
    int stock;

    Book(string title, string author, string publisher, int year, int stock) {
        this->title = title;
        this->author = author;
        this->publisher = publisher;
        this->year = year;
        this->stock = stock;
    }
};

class Library {
public:
    vector<Book> books;

    void addBook() {
        string title, author, publisher;
        int year, stock;

        cout << "Enter book title: ";
        getline(cin, title);

        cout << "Enter book author: ";
        getline(cin, author);

        cout << "Enter book publisher: ";
        getline(cin, publisher);

        cout << "Enter book year: ";
        cin >> year;

        cout << "Enter book stock: ";
        cin >> stock;

        Book book(title, author, publisher, year, stock);
        books.push_back(book);

        cout << "Book added successfully." << endl;
    }

    void modifyBook() {
        string title;
        bool found = false;

        cout << "Enter book title to modify: ";
        getline(cin, title);

        for (int i = 0; i < books.size(); i++) {
            if (books[i].title == title) {
                found = true;

                cout << "Enter new book title: ";
                getline(cin, books[i].title);

                cout << "Enter new book author: ";
                getline(cin, books[i].author);

                cout << "Enter new book publisher: ";
                getline(cin, books[i].publisher);

                cout << "Enter new book year: ";
                cin >> books[i].year;

                cout << "Enter new book stock: ";
                cin >> books[i].stock;

                cout << "Book modified successfully." << endl;
                break;
            }
        }

        if (!found) {
            cout << "Book not found." << endl;
        }
    }

    void searchBook() {
        string title;
        bool found = false;

        cout << "Enter book title to search: ";
        getline(cin, title);

        for (int i = 0; i < books.size(); i++) {
            if (books[i].title == title) {
                found = true;

                cout << "Title: " << books[i].title << endl;
                cout << "Author: " << books[i].author << endl;
                cout << "Publisher: " << books[i].publisher << endl;
                cout << "Year: " << books[i].year << endl;
                cout << "Stock: " << books[i].stock << endl;
                break;
            }
        }

        if (!found) {
            cout << "Book not found." << endl;
        }
    }

    void deleteBook() {
        string title;
        bool found = false;

        cout << "Enter book title to delete: ";
        getline(cin, title);

        for (int i = 0; i < books.size(); i++) {
            if (books[i].title == title) {
                found = true;
                books.erase(books.begin() + i);
                cout << "Book deleted successfully." << endl;
                break;
            }
        }

        if (!found) {
            cout << "Book not found." << endl;
        }
    }

    void displayBooks() {
        for (int i = 0; i < books.size(); i++) {
            cout << "Title: " << books[i].title << endl;
            cout << "Author: " << books[i].author << endl;
            cout << "Publisher: " << books[i].publisher << endl;
            cout << "Year: " << books[i].year << endl;
            cout << "Stock: " << books[i].stock << endl;
            cout << endl;
        }
    }
};

int main() {
    Library library;

    while (true) {
        cout << "1. Add book" << endl;
        cout << "2. Modify book" << endl;
        cout << "3. Search book" << endl;
        cout << "4. Delete book" << endl;
        cout << "5. Display all books" << endl;
        cout << "6. Exit" << endl;

        int choice;
        cin >> choice;
        cin.ignore();

        switch (choice) {
        case 1:
            library.addBook();
            break;
        case 2:
            library.modifyBook();
            break;
        case 3:
            library.searchBook();
            break;
        case 4:
            library.deleteBook();
            break;
        case 5:
            library.displayBooks();
            break;
        case 6:
            return 0;
        default:
            cout << "Invalid choice." << endl;
        }
    }

    return 0;
}

这个图书管理系统使用了两个类，`Book`和`Library`。`Book`类表示一本书，包含书名、作者、出版社、出版年份和库存等属性。`Library`类表示整个图书馆，包含一个`vector`存储所有书籍，还实现了添加、修改、查询、删除和展示书籍的功能。

在`main`函数中，我们使用一个无限循环来实现菜单，并根据用户不同的选择调用`Library`类中的不同函数来执行相应的功能。

这个图书管理系统还可以进一步完善，例如可以添加借书和还书的功能，或者将数据存储在文件中以实现持久化等。