（一）Order

#include<iostream>
using namespace std;

class Order
{
    public:
        virtual void printOrder() {cout << "订单内容!" << endl; }
};

class Decorator:public Order  //(1)
{
    private: 
        Order *order;
    public:
        Decorator(Order *order)
        {
            this->order = order; //(2)
        }
        void printOrder()
        {
            if(order != NULL)
            {
                order->printOrder();
            }
        }
};

class HeadDecorator:public Decorator   
{
    public:
        HeadDecorator(Order *order):Decorator(order) //(3)
        {            
        }
        void printOrder()
        {
            cout << "订单抬头!" << endl;
            Decorator::printOrder();
        }
};

class FootDecorator:public Decorator
{
    public:
        FootDecorator(Order *order):Decorator(order) //(4)
        {
        }
        void printOrder()
        {
            Decorator::printOrder(); //(5)
            cout << "订单脚注!" << endl;
        }
};

class PrintOrder: public Order//(6)
{
    private: 
        Order *order;
    public:
        PrintOrder(Order *order)
        {
            this->order = order; //(7)
        }
        void printOrder()
        {
            FootDecorator *foot = new FootDecorator(order);
            HeadDecorator *head = new HeadDecorator(order);
            head->printOrder();
            cout << "----------------------" << endl;
            FootDecorator foot1(NULL);
            HeadDecorator head1(&foot1);
            head1.printOrder();
        }
};

int main()
{
    Order *order = new Order();
    Order *print = new PrintOrder(order);
    print->printOrder();
}

答案：
(1) : public Order

(2) this->order 或 (*this).order

(3) Decorator(order)

(4) Decorator(order)

(5) Decorator::printOrder()

(6) : public Order

(7) this->order 或 (*this).order