写一个包含增删改查的图书管理系统

好的，以下是一个简单的图书管理系统的代码示例：

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

using namespace std;

struct Book {
    string title;
    string author;
    int year;
};

vector<Book> books;

void addBook() {
    Book book;
    cout << "请输入书名：";
    cin >> book.title;
    cout << "请输入作者：";
    cin >> book.author;
    cout << "请输入出版年份：";
    cin >> book.year;
    books.push_back(book);
    cout << "添加成功！" << endl;
}

void deleteBook() {
    string title;
    cout << "请输入要删除的书名：";
    cin >> title;
    for (int i = 0; i < books.size(); i++) {
        if (books[i].title == title) {
            books.erase(books.begin() + i);
            cout << "删除成功！" << endl;
            return;
        }
    }
    cout << "未找到该书！" << endl;
}

void updateBook() {
    string title;
    cout << "请输入要修改的书名：";
    cin >> title;
    for (int i = 0; i < books.size(); i++) {
        if (books[i].title == title) {
            cout << "请输入新的书名：";
            cin >> books[i].title;
            cout << "请输入新的作者：";
            cin >> books[i].author;
            cout << "请输入新的出版年份：";
            cin >> books[i].year;
            cout << "修改成功！" << endl;
            return;
        }
    }
    cout << "未找到该书！" << endl;
}

void searchBook() {
    string title;
    cout << "请输入要查找的书名：";
    cin >> title;
    for (int i = 0; i < books.size(); i++) {
        if (books[i].title == title) {
            cout << "书名：" << books[i].title << endl;
            cout << "作者：" << books[i].author << endl;
            cout << "出版年份：" << books[i].year << endl;
            return;
        }
    }
    cout << "未找到该书！" << endl;
}

int main() {
    while (true) {
        cout << "请选择操作：" << endl;
        cout << "1. 添加书籍" << endl;
        cout << "2. 删除书籍" << endl;
        cout << "3. 修改书籍" << endl;
        cout << "4. 查找书籍" << endl;
        cout << "5. 退出" << endl;
        int choice;
        cin >> choice;
        switch (choice) {
            case 1:
                addBook();
                break;
            case 2:
                deleteBook();
                break;
            case 3:
                updateBook();
                break;
            case 4:
                searchBook();
                break;
            case 5:
                return 0;
            default:
                cout << "无效的选择！" << endl;
        }
    }
    return 0;
}

这个程序包含了增加、删除、修改和查找书籍的功能。用户可以通过输入数字选择要进行的操作。