using namespace std;

​

class Book

{

private:

    int current_page_;

    void set_percent();

public:

    Book(const string& title, int total_page);

    string title_;

    int total_page_;

    double percent_;

    void Move(int page);

    void Open();

    void Read();

    const Book& ThickerBook(const Book&);   // ThickerBook() 함수의 원형 

};

​

int main(void)

{

    Book web_book("HTML과 CSS", 350);

    Book html_book("HTML 레퍼런스", 200);

    cout << web_book.ThickerBook(html_book).title_; // 더 두꺼운 책의 이름을 출력함. 

    return 0;

}

​

Book::Book(const string& title, int total_page)

{

    title_ = title;

    total_page_ = total_page;

    current_page_ = 0;

    set_percent();

}

​

void Book::set_percent()

{

    percent_ = (double) current_page_ / total_page_ * 100;

}

​

const Book& Book::ThickerBook(const Book& comp_book)

{

    if (comp_book.total_page_ > this->total_page_)

    {

        return comp_book;

    }

    else

    {

        return *this;

    }

}