试题内容
【说明】
某发票（lnvoice）由抬头（Head）部分、正文部分和脚注（Foot）部分构成。现采用装饰（ Decorator）模式实现打印发票的功能，得到如图5-1所示的类图。
【C++代码】
#include
using namespace std;
class Invoice{ public:
（1） {
cout<<"This is the content of the invoice!"<
};
class Decorator : public Invoice {
Invoice *ticket;
public:
Decorator(lnvoice *t) { ticket = t; }
void printInvoice(){
if(ticket != NULL) （2）;
}
};
class HeadDecorator : public Decorator{
public:
HeadDecorator(lnvoice*t): Decorator(t) { }
void printInvoice() {
cout<< "This is the header of the invoice! "<< endl;
（3） ;
}
};
class FootDecorator : public Decorator{
public:
FootDecorator(Invoice *t): Decorator(t) { }
void printlnvoice(){
（4） ;
cout<< "This is the footnote of the invoice!"<< endl;
}
};
int main(void) {
Invoice t;
FootDecorator f(&t);
HeadDecorator h(&f);
h.printInvoice();
cout<<”------------------------”<
HeadDecorator b( （5） );
b.printInvoice();
return 0;
}
程序的输出结果为：
This is the header of the invoice!
This is the content of the invoice!
This is the footnote of the invoice!
----------------------------
This is the header of the invoice!
This is the footnote of the invoice!
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