c++实现控制台图书管理系统（使用fstream）(将其分为读者和管理员两大部分)（读者拥有借书，还书的功能）（管理员拥有增减书籍，增减读者的功能）

好的，这是一个比较典型的图书管理系统的实现，下面是一份基本的伪代码实现：

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

using namespace std;

class Book {
public:
    string title;
    string author;
    string ISBN;
    bool borrowed;
    string borrower;

    Book(string title, string author, string ISBN) {
        this->title = title;
        this->author = author;
        this->ISBN = ISBN;
        borrowed = false;
        borrower = "";
    }
};

class Reader {
public:
    string name;
    vector<Book*> borrowed_books;

    Reader(string name) {
        this->name = name;
    }

    bool borrow(Book* book) {
        if (book->borrowed)
            return false;
        book->borrowed = true;
        book->borrower = name;
        borrowed_books.push_back(book);
        return true;
    }

    bool return_book(Book* book) {
        for (int i=0; i<borrowed_books.size(); ++i) {
            if (borrowed_books[i] == book) {
                book->borrowed = false;
                book->borrower = "";
                borrowed_books.erase(borrowed_books.begin() + i);
                return true;
            }
        }
        return false;
    }
};

class Admin {
public:
    vector<Book*> book_list;
    vector<Reader*> reader_list;

    void add_book(Book* book) {
        book_list.push_back(book);
    }

    void remove_book(Book* book) {
        for (int i=0; i<book_list.size(); ++i) {
            if (book_list[i] == book) {
                book_list.erase(book_list.begin() + i);
                return;
            }
        }
    }

    void add_reader(Reader* reader) {
        reader_list.push_back(reader);
    }

    void remove_reader(Reader* reader) {
        for (int i=0; i<reader_list.size(); ++i) {
            if (reader_list[i] == reader) {
                reader_list.erase(reader_list.begin() + i);
                return;
            }
        }
    }
};

int main() {
    Admin admin;
    Reader* reader = new Reader("Alice");
    Book* book1 = new Book("The Lord of the Rings", "J.R.R. Tolkien", "978-0544003415");
    Book* book2 = new Book("Harry Potter and the Philosopher's Stone", "J.K. Rowling", "978-1781100219");
    admin.add_reader(reader);
    admin.add_book(book1);
    admin.add_book(book2);
    cout << "Welcome to the library management system!" << endl;
    while (true) {
        cout << "Please select your role: " << endl;
        cout << "1. Reader" << endl;
        cout << "2. Admin" << endl;
        int role;
        cin >> role;
        if (role == 1) {
            cout << "Welcome, " << reader->name << "!" << endl;
            while (true) {
                cout << "Please select your action: " << endl;
                cout << "1. Borrow a book" << endl;
                cout << "2. Return a book" << endl;
                cout << "3. Exit" << endl;
                int action;
                cin >> action;
                if (action == 1) {
                    cout << "Please input the book's ISBN: " << endl;
                    string ISBN;
                    cin >> ISBN;
                    bool found = false;
                    for (int i=0; i<admin.book_list.size(); ++i) {
                        if (admin.book_list[i]->ISBN == ISBN) {
                            if (reader->borrow(admin.book_list[i])) {
                                cout << "Borrow success!" << endl;
                            } else {
                                cout << "Borrow failed: the book is already borrowed!" << endl;
                            }
                            found = true;
                            break;
                        }
                    }
                    if (!found) {
                        cout << "Book not found!" << endl;
                    }
                } else if (action == 2) {
                    cout << "Please input the book's ISBN: " << endl;
                    string ISBN;
                    cin >> ISBN;
                    bool found = false;
                    for (int i=0; i<reader->borrowed_books.size(); ++i) {
                        if (reader->borrowed_books[i]->ISBN == ISBN) {
                            reader->return_book(reader->borrowed_books[i]);
                            cout << "Return success!" << endl;
                            found = true;
                            break;
                        }
                    }
                    if (!found) {
                        cout << "Book not found in your borrowed list!" << endl;
                    }
                } else if (action == 3) {
                    break;
                }
            }
        } else if (role == 2) {
            cout << "Welcome, Administrator!" << endl;
            while (true) {
                cout << "Please select your action: " << endl;
                cout << "1. Add a book" << endl;
                cout << "2. Remove a book" << endl;
                cout << "3. Add a reader" << endl;
                cout << "4. Remove a reader" << endl;
                cout << "5. Exit" << endl;
                int action;
                cin >> action;
                if (action == 1) {
                    cout << "Please input the book's title, author and ISBN: " << endl;
                    string title, author, ISBN;
                    cin >> title >> author >> ISBN;
                    Book* book = new Book(title, author, ISBN);
                    admin.add_book(book);
                    cout << "Add success!" << endl;
                } else if (action == 2) {
                    cout << "Please input the book's ISBN: " << endl;
                    string ISBN;
                    cin >> ISBN;
                    bool found = false;
                    for (int i=0; i<admin.book_list.size(); ++i) {
                        if (admin.book_list[i]->ISBN == ISBN) {
                            admin.remove_book(admin.book_list[i]);
                            cout << "Remove success!" << endl;
                            found = true;
                            break;
                        }
                    }
                    if (!found) {
                        cout << "Book not found!" << endl;
                    }
                } else if (action == 3) {
                    cout << "Please input the reader's name: " << endl;
                    string name;
                    cin >> name;
                    Reader* reader = new Reader(name);
                    admin.add_reader(reader);
                    cout << "Add success!" << endl;
                } else if (action == 4) {
                    cout << "Please input the reader's name: " << endl;
                    string name;
                    cin >> name;
                    bool found = false;
                    for (int i=0; i<admin.reader_list.size(); ++i) {
                        if (admin.reader_list[i]->name == name) {
                            admin.remove_reader(admin.reader_list[i]);
                            cout << "Remove success!" << endl;
                            found = true;
                            break;
                        }
                    }
                    if (!found) {
                        cout << "Reader not found!" << endl;
                    }
                } else if (action == 5) {
                    break;
                }
            }
        } else {
            cout << "Invalid role!" << endl;
        }
    }
    return 0;
}

需要注意的几个问题：

1. 该实现中使用了面向对象的设计思想，通过定义 Book 类、Reader 类和 Admin 类来实现图书管理系统的各种功能。
2. 在 main 函数中，分别对读者和管理员进行了不同的处理，并利用 while 循环来保持程序的持续运行。
3. 在用户输入数据时，需要做好输入校验和异常处理，以防止程序出现崩溃的情况。
4. 在使用 fstream 进行文件读写操作时，还需要注意文件的打开和关闭操作。