ostream& operator <<(ostream& out, const Coord& C) {
    out << "x = " << C.x << endl;
    out << "y = " << C.y << endl;
    return out;
};

istream& operator >>(istream& is, Coord& C)
{
    cout << "Введите x\n";
    is >> C.x;
    cout << "Введите y\n";
    is >> C.y;
    return is;
}