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();

};

​

int main(void)

{

    Book web_book("HTML과 CSS", 350);    // 생성자의 암시적 호출 

    // 생성자가 호출되어 멤버 변수인 percent_가 초기화되었는지를 확인함. 

    cout << web_book.percent_;

    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;

}