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如果负债一价值比在项生命周期内保持不变,则使用调整净现值法(APV)考察杠杆公司的价值较为便捷。

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某图书管理系统中管理着两种类型的文献:图书和论文。现在要求统计所有馆藏文献的总页码(假设图书馆中有一本540页的图书和两篇各25页的论文,那么馆藏文献的总页码就是590页)。采用Visitor(访问者)模式实现该要求,得到如图5-1所示的类图。图5-1 Visitor模式类图【C++代码】class LibraryVisitor;class LibraryItemInterface{public:(1);};class Article:public LibraryItemInterface{private:string?m_title; 论文名string?m_author; 论文作者int m_start_page;int m_end_page;public:Article(string p_author,string p_title,int p_start_page,int p_end_page);int getNumberOfPages( );void accept(Library Visitor*visitor);};class Book:public LibraryItemInterface{private:string?m_title; 书名string?m_author; 作者int m_pages; 页数public:Book(string p_author,string p_title,int p_pages);int getNumberOfPages( );void accept(LibraryVisitor*visitor);};class LibraryVisitor{public:(2);(3);virtual void printSum( )=0;};class LibrarySumPrintVisitor:public LibraryVisitor{ 打印总页数private:int sum;public:LibrarySumPrintVisitor( );void visit(Book*p_book);void visit(Article*p_article);void printSum( );}; visitor.cppint Article::getNumberOfPages( ){retum m_end_page-m_start_page;}void Article::accept(LibraryVisitor*visitor){(4);}Book::Book(string p_author,string p_title,int p_pages){m_title=p_title;m_author=p_author;m_pages=p_pages;}int Book::getNumberOfPages( ){return m_pages;}void Book::accept(LibraryVisitor*visitor){(5);} 其余代码省略