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[问答题] 阅读下列说明和C++-代码,将应填入 (n) 处的字句写在答题纸的对应栏内。【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。中级软件设计师,章节练习,系统开发和运行知识【C++代码】#include<iostream>usingnamespace std;class Invoice{public: (1) { cout<<"This is the content of theinvoice!"<<endl; }};classDecorator : public Invoice { Invoice *ticket;public: Decorator(lnvoice *t) { ticket = t; } void printInvoice( ){ if(ticket != NULL) (2); } };classHeadDecorator : public Decorator{public: HeadDecorator(lnvoice*t): Decorator(t) { } void printInvoice( ) { cout<< "This is theheader of the invoice! "<< endl; (3) ; } }; class FootDecorator : public Decorator{ public: FootDecorator(Invoice *t): Decorator(t) { } void printlnvoice( ){ (4) ; cout<< "This is thefootnote of the invoice!"<< endl; }};int main(void){ Invoice t; FootDecorator f(&t); HeadDecorator h(&f); h.printInvoice( ); cout<<”------------------------”<<endl; FootDecorator a(NULL) ; 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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