Please define a class Book and its data members and member functions ，according to the following description.Don’t implement any member functions. (1) Each book has a title, one or more authors, and an international standard book number (ISBN). (2) Class Book has two constructor: (a) the first should be a default constructor, (b) the second should take two arguments: the title and the ISBN. (3) The authors can be added one by one. (4) For the title and ISBN of a Book，a “set”function and a “get” function are required，Each “set ”function undates the corresponding data member to a new value through its parameters and each “get”function returns the value of the corresponding data member to caller.

Here is an example implementation of the Book class:

class Book {
private:
    string title;  // the book title
    vector<string> authors;  // the book authors
    string isbn;  // the book ISBN

public:
    // Default constructor
    Book() {
        title = "";
        isbn = "";
    }

    // Constructor with title and ISBN arguments
    Book(string title, string isbn) {
        this->title = title;
        this->isbn = isbn;
    }

    // Add an author to the vector of authors
    void addAuthor(string author) {
        authors.push_back(author);
    }

    // Set the book title
    void setTitle(string title) {
        this->title = title;
    }

    // Set the book ISBN
    void setISBN(string isbn) {
        this->isbn = isbn;
    }

    // Get the book title
    string getTitle() const {
        return title;
    }

    // Get the book ISBN
    string getISBN() const {
        return isbn;
    }
};

In this implementation, the Book class has three private data members: `title`, `authors`, and `isbn`. It also has a default constructor, which sets `title` and `isbn` to empty strings, and a constructor that takes `title` and `isbn` arguments.

The `addAuthor` function allows new authors to be added to the vector of authors. The `setTitle` and `setISBN` functions update the corresponding data members with new values passed in through their parameters.

Finally, there are two "get" functions: `getTitle` and `getISBN`, which return the values of the corresponding data members. These functions are marked as `const` to indicate that they do not modify the object.