题目内容

It can be taken as lecturing plus discussion—the discussion being a follow-up of the lecturing.

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阅读下列函数说明和C++代码，回答问题
[说明]
对多个元素的聚合进行遍历访问时，需要依次推移元素，例如对数组通过递增下标的方式，数组下标功能抽象化、一般化的结果就称为迭代器(Iterator)。模式以下程序模拟将书籍(Book)放到书架(BookShelf)上并依次输出书名。这样就要涉及到遍历整个书架的过程。使用迭代器Iterator实现。图5-1显示了各个类间的关系。以下是C++语言实现，能够正确编译通过。
[图5-1]
[C++代码]
template (1) ＞
class Iterator{
public:
virtual bool hasNext() = 0;
(2) Object* next() = 0;
};
class Book{
//省略具体方法和属性
};
class BookShelf{
private:
vector books;
public:
BookShelf(){
}
Book* getBookAt(int index){
return &booksindex;
}
int getLength(){
return books. size();
}
};
template
class BookshelfIterator : public (3) {
private:
BookShelf * bookShelf;
int index;
public:
BookshelfIterator(BookShelf bookShelf){
this-＞bookShelf = bookShelf;
index = 0;
}
bool hasNext(){//判断是否还有下一个元素
if(index ＜ bookShelf-＞getLength()){
return true;
}else{
return false;
}
}
Objeot next(){//取得下一个元素
return bookShelf-＞getBookAt(index++);
}
};
int main()
{
BookShelf bookShelf;
//将书籍上架，省略代码
Book book;
Iterator it = new BookShelfIterator((4) );
while((5) ){//遍历书架，输出书名
book=(Book)it-＞next();
/访问元素*/
}
return 0;
}

(2011年考试真题)事业单位当年经营收入扣除经营支出后的余额，无论是正数还是负数，均直接计入事业基金。()

听力原文：Woman: May I help you？
Man: Yes, I would like to place an order for toner cartridges. We have a standing agreement with your company, so we will need the same amount as last time.
Woman: Let me key in your information into my computer. I will pull up our records for you. Do you have an order number？ What name is the order listed under？
Man: It should be under Smith. The number is 184796 A．
Woman: Yes, Mr. Smith. I have an order for three cases of cartridges, is that what you would like to refill？
Man: Yes.
Woman: Is there the correct billing address？
Man: No, please post the bill to 124 Hildrod Lane, Milton County, 98830．
Woman: I will send you an invoice in the next few days. Your order should be delivered before the end of the day on Monday.
Man: Thank you.
(1)

计算该企业2009年铁路运输合同应纳印花税(运输合同印花税税率为0.5‰，保管合同印花税税率为1‰)；