周二打卡

题目描述：

设计一个简单的图书管理系统，需要实现以下功能：

1. 添加书籍：输入书名、作者、出版社、出版日期等信息，添加一本新书。
2. 删除书籍：输入书号或书名，删除一本已有的书籍。
3. 查询书籍：输入书号或书名，查询一本已有的书籍。
4. 显示所有书籍：按照书号排序，输出图书馆中所有的书籍。

设计思路：

为了实现这个图书管理系统，需要设计以下几个类:

1. Book类：用于储存书籍信息，包括书名、作者、出版社、出版日期等属性，以及一些方法，如获取与设置书籍信息。
2. Library类：用于储存所有的书籍，包括添加书籍、删除书籍、查询书籍、显示所有书籍等方法。
3. Menu类：用于显示菜单，接收用户输入，并调用相应的Library类中的方法。

程序流程图：

start --> displayMenu --> getUserChoice --> performAction --> end
                        |               |
                        v               v
                    addBook          removeBook
                        |               |
                        v               v
                      search          display

代码实现：

#include <bits/stdc++.h>
using namespace std;
class Book {
private:
    string title;
    string author;
    string publisher;
    string publicationDate;
public:
    Book(string t, string a, string p, string pd) :
        title(t), author(a), publisher(p), publicationDate(pd) {}
    string getTitle() { return title; }
    string getAuthor() { return author; }
    string getPublisher() { return publisher; }
    string getPublicationDate() { return publicationDate; }
};



class Library {
private:
    vector<Book> books;
public:
    void addBook(Book book) {
        books.push_back(book);
    }
    void removeBook(string bookTitle) {
        for (int i = 0; i < books.size(); i++) {
            if (books[i].getTitle() == bookTitle) {
                books.erase(books.begin() + i);
                break;
            }
        }
    }
    Book searchBook(string bookTitle) {
        for (int i = 0; i < books.size(); i++) {
            if (books[i].getTitle() == bookTitle) {
                return books[i];
            }
        }
        // 如果没找到书籍，则返回一个空的Book对象
        return Book("", "", "", "");
    }
    void displayAllBooks() {
        // 按照书名排序
        sort(books.begin(), books.end(), [](Book a, Book b) {
            return a.getTitle() < b.getTitle();
        });

        // 输出所有的书籍
        for (Book book : books) {
            cout << "Title: " << book.getTitle() << endl;
            cout << "Author: " << book.getAuthor() << endl;
            cout << "Publisher: " << book.getPublisher() << endl;
            cout << "Publication Date: " << book.getPublicationDate() << endl << endl;
        }
    }
};



class Menu {
private:
    Library library;
public:
    Menu() {
        library = Library();
    }

    void displayMenu() {
        cout << "1. Add a book" << endl;
        cout << "2. Remove a book" << endl;
        cout << "3. Search for a book" << endl;
        cout << "4. Display all books" << endl;
        cout << "5. Quit" << endl << endl;
    }

    int getUserChoice() {
        int choice;
        cout << "Enter your choice: ";
        cin >> choice;
        cout << endl;
        return choice;
    }

    void performAction(int choice) {
        string title, author, publisher, publicationDate;
        Book book("", "", "", "");

        switch (choice) {
            case 1:
                cout << "Enter the title of the book: ";
                getline(cin >> ws, title);
                cout << "Enter the author of the book: ";
                getline(cin >> ws, author);
                cout << "Enter the publisher of the book: ";
                getline(cin >> ws, publisher);
                cout << "Enter the publication date of the book: ";
                getline(cin >> ws, publicationDate);
                book = Book(title, author, publisher, publicationDate);
                library.addBook(book);
                cout << title << " has been added to the library." << endl << endl;
                break;
            case 2:
                cout << "Enter the title of the book you want to remove: ";
                getline(cin >> ws, title);
                library.removeBook(title);
                cout << title << " has been removed from the library." << endl << endl;
                break;
            case 3:
                cout << "Enter the title of the book you want to search for: ";
                getline(cin >> ws, title);
                book = library.searchBook(title);
                if (book.getTitle() != "") {
                    cout << "Title: " << book.getTitle() << endl;
                    cout << "Author: " << book.getAuthor() << endl;
                    cout << "Publisher: " << book.getPublisher() << endl;
                    cout << "Publication Date: " << book.getPublicationDate() << endl << endl;
                } else {
                    cout << title << " is not in the library." << endl << endl;
                }
                break;
            case 4:
                library.displayAllBooks();
                break;
            case 5:
                exit(0);
                break;
            default:
                cout << "Invalid choice. Please try again." << endl << endl;
        }
    }
};

int main() {
    Menu menu = Menu();
    int choice;

    while (true) {
        menu.displayMenu();
        choice = menu.getUserChoice();
        menu.performAction(choice);
    }

    return 0;
}