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，需要基类，派生类，要能进行数据增删改查和保存和读取。

好的，我可以为您提供一个简单的图书管理系统的代码，具体如下：

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

using namespace std;

class Book{
public:
    string name;
    string author;
    int price;
    Book(string name,string author,int price):name(name),author(author),price(price){};
};

class Library{
private:
    vector<Book> books;
public:
    void addBook(){
        cout << "请输入书名：";
        string name;
        cin >> name;
        cout << "请输入作者：";
        string author;
        cin >> author;
        cout << "请输入价格：";
        int price;
        cin >> price;
        books.push_back(Book(name,author,price));
        cout << "添加成功！" << endl;
    }
    void deleteBook(){
        cout << "请输入要删除的书名：";
        string name;
        cin >> name;
        for(int i=0;i<books.size();i++){
            if(books[i].name == name){
                books.erase(books.begin()+i);
                cout << "删除成功！" << endl;
                return;
            }
        }
        cout << "未找到该书籍，请输入正确的书名！" << endl;
    }
    void updateBook(){
        cout << "请输入要修改的书名：";
        string name;
        cin >> name;
        for(int i=0;i<books.size();i++){
            if(books[i].name == name){
                cout << "请输入修改后的书名：";
                cin >> books[i].name;
                cout << "请输入修改后的作者：";
                cin >> books[i].author;
                cout << "请输入修改后的价格：";
                cin >> books[i].price;
                cout << "修改成功！" << endl;
                return;
            }
        }
        cout << "未找到该书籍，请输入正确的书名！" << endl;
    }
    void searchBook(){
        cout << "请输入要查找的书名：";
        string name;
        cin >> name;
        for(int i=0;i<books.size();i++){
            if(books[i].name == name){
                cout << "书名：" << books[i].name << endl;
                cout << "作者：" << books[i].author << endl;
                cout << "价格：" << books[i].price << endl;
                return;
            }
        }
        cout << "未找到该书籍，请输入正确的书名！" << endl;
    }
    void saveToFile(){
        ofstream out("book.txt");
        for(int i=0;i<books.size();i++){
            out << books[i].name << " " << books[i].author << " " << books[i].price << endl;
        }
        out.close();
        cout << "保存成功！" << endl;
    }
    void readFromFile(){
        ifstream in("book.txt");
        if(!in.is_open()){
            cout << "文件不存在！" << endl;
            return;
        }
        books.clear();  //清空原来的数据
        string name,author;
        int price;
        while(!in.eof()){   //eof()函数判断是否到文件结尾
            in >> name >> author >> price;
            books.push_back(Book(name,author,price));
        }
        in.close();
        cout << "读取成功！" << endl;
    }
};

int main(){
    Library library;
    while(true){
        cout << "请选择操作：1.添加书籍 2.删除书籍 3.修改书籍 4.查找书籍 5.保存到文件 6.从文件读取 7.退出" << endl;
        int choice;
        cin >> choice;
        switch(choice){
            case 1:
                library.addBook();
                break;
            case 2:
                library.deleteBook();
                break;
            case 3:
                library.updateBook();
                break;
            case 4:
                library.searchBook();
                break;
            case 5:
                library.saveToFile();
                break;
            case 6:
                library.readFromFile();
                break;
            case 7:
                cout << "谢谢使用！" << endl;
                return 0;
            default:
                cout << "请选择正确的操作！" << endl;
        }
    }
}

这个图书管理系统包含了基类 `Book` 和派生类 `Library`，能够在控制台进行数据增删改查和保存和读取。