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軟件設(shè)計(jì)師案例分析每日一練試題內(nèi)容（2022/2/11）

試題五（共15分）
閱讀下列說明和C++-代碼，將應(yīng)填入（n）處的字句寫在答題紙的對應(yīng)欄內(nèi)。
【說明】
某發(fā)票（lnvoice）由抬頭（Head）部分、正文部分和腳注（Foot）部分構(gòu)成?，F(xiàn)采用裝飾（Decorator）模式實(shí)現(xiàn)打印發(fā)票的功能，得到如圖5-1所示的類圖。

【C++代碼】
#include<iostream>
using namespace std；
class invoice{
public：
（1）{
cout<<"This is the content of the invoice!"<<endl;
}
};
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 printinvoice0{
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.printlnvoice（）;
cout<<“_____”<<endl;
FootDecorator a（NULL）;
HeadDecorator b（（5））;
B．printinvoice（）;
return 0;
}
程序的輸出結(jié)果為：
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!