class Vector {
public:
    double x_, y_;
    Vector(double x = 0, double y = 0)
    {
        this->x_ = x;
        this->y_ = y;
    }
    void print(int precision = 2, bool newLine = true)
    {
        cout << "(" << setprecision (precision) << fixed << this->x_ <<  ", " << setprecision (precision) << fixed << this->y_ << ")";
        if (newLine) cout << endl;
    }
    Vector add (const Vector& v) const
    {
        Vector ret;
        ret.x_ = this->x_ + v.x_;
        ret.y_ = this->y_ + v.y_;
        return ret;
    }
    Vector& addTo (const Vector& v)
    {
        this->x_ += v.x_;
        this->y_ += v.y_;
        return *this;
    }
};