class food{

 name;
 calories;
 weight;

 public eat(name);

 }

class pizza inherits food{

  toppings;

  say_toppings();

}

bool lid_open = false;
void open_water_bottle_by_twisting() { lid_open = true; }

class Container
{
    bool lid_open = false;

protected:
    Container() {}
    void open_by_twisting()
    {
        lid_open = true;
    }
public:
    virtual ~Container();
};

class WaterBottle : public Container
{
    WaterBottle() : Container() {}
public:
    ~WaterBottle();
};

class Container
{
    bool lid_open;
    bool straw_open;

protected:
    void TurnLid() { lid_open = true; }
    void BendStraw() { straw_open = true; }
    Container() : lid_open(false), straw_open(false){}

public:
    virtual void open() = 0;
    virtual ~Container();
};

class WaterBottle : public Container
{

public:
    WaterBottle() : Container() {}
    void open()
    {
        TurnLid();
    }
    ~WaterBottle();
};

class ExerciseBottle : public Container
{
public:
    ExerciseBottle() : Container() {}
    void open()
    {
        BendStraw();
    }
    ~ExerciseBottle();
};