C Primer课后习题解答(第1 18章完整答案)完整版.docVIP

C++Primer课后习题解答(第1~18章完整答案)完整版 导读：就爱阅读网友为您分享以下“C++Primer课后习题解答(第1~18章完整答案)完整版”的资讯，希望对您有所帮助，感谢您对92的支持! }; ostreamamp; operator lt;lt; ( ostream amp; os, Item_base amp; ib) { os lt;lt; quot;\tUsing operator lt;lt; ( ostream amp; , Item_base amp; );quot; lt;lt; endl lt;lt; quot;\tVisit Item_base #39;s book():\tquot; lt;lt; ib.isbn lt;lt; endl lt;lt; quot;\tVisit Item_base #39;s net_price():quot; lt;lt; quot;\t3 《quot; lt;lt; ib.book() lt;lt; quot;》, the price is:\tquot; lt;lt; _price( 3 ) lt;lt; endl; return os; } class Bulk_item : public Item_base { public: Bulk_item ( const string amp;book =quot;quot;, double sales_price = 0.0, size_t qty = 0, double disc = 0.0 ): Item_base ( book, sales_price ), min_qty( qty ), discount ( disc ) { cout lt;lt; quot;Using Bulk_item#39;s constructor.quot; lt;lt; endl; } double net_price( size_t cnt ) const { if ( cnt gt; min_qty ) return cnt * ( 1- discount ) * price; else return cnt * price; } ~Bulk_item() { cout lt;lt; quot;Using Bulk_item#39;s destructor.quot; lt;lt; endl; system(quot;pausequot;); } private: size_t min_qty; double discount; }; ostreamamp; operator lt;lt; ( ostream amp; os, Bulk_item amp; bi ) { os lt;lt; quot;\tUsing operator lt;lt; ( ostream amp; , Bulk_item amp; )quot; lt;lt; endl lt;lt; quot;\tVisit Bulk_item#39;s book():\tquot; lt;lt; bi .book() lt;lt; endl lt;lt; quot;\tVisit Bulk_item#39