using namespace std;

​

class Position

{

private:

    double x_;

    double y_;

public:

    Position(double x, double y);   // 생성자 

    void Display();

    friend Position operator-(const Position& pos1, const Position& pos2);  // - 연산자 함수 

};

​

int main(void)

{

    Position pos1 = Position(3.3, 12.5);

    Position pos2 = Position(-14.4, 7.8);

    Position pos3 = pos1 - pos2;

    pos3.Display();

    return 0;

}

​

Position::Position(double x, double y)

{

    x_ = x;

    y_ = y;

}

​

Position operator-(const Position& pos1, const Position& pos2)

{

    return Position((pos1.x_ + pos2.x_)/2, (pos1.y_ + pos2.y_)/2);

}

​

void Position::Display()

{

    cout << "두 지점의 중간 지점의 좌표는 x좌표가 " << this->x_ << "이고, y좌표가 " << this->y_ << "입니다." << endl;

}