using namespace std;

​

class Rect

{

private:

    double height_;

    double width_;

public:

    Rect(double height, double width);  // 생성자 

    void DisplaySize();

    Rect operator*(double mul) const;

    friend Rect operator*(double mul, const Rect& origin);  // 프렌드 함수 

};

​

int main(void)

{

    Rect origin_rect(10, 20);

    Rect rect01 = origin_rect * 2;

    Rect rect02 = 3 * origin_rect;

    rect01.DisplaySize();

    rect02.DisplaySize();

    return 0;

}

​

Rect::Rect(double height, double width)

{

    height_ = height;

    width_ = width;

}

​

void Rect::DisplaySize()

{

    cout << "이 사각형의 높이는 " << this->height_ << "이고, 너비는 " << this->width_ << "입니다." << endl;

}

​

Rect Rect::operator*(double mul) const

{

    return Rect(height_ * mul, width_ * mul);

}

​

Rect operator*(double mul, const Rect& origin)

{

    return origin * mul;

}