C++primer 15.4-day exercise

Exercise 15.15, Exercise 15.16

1#include <iostream>2#include <string>3#include <utility>4#include <memory>5#include <vector>6 7 using namespacestd;8 9 classQuote {Ten  Public: OneQuote () =default; AQuote (Const string&book,Doublesales_price): Bookno (book), Price (Sales_price) {} -     Const string& ISBN ()Const{returnBookno;} -     Virtual DoubleNet_price (size_t N)Const{returnn *Price ;} the     Virtual~quote () =default; - Private: -     stringBookno; - protected: +     DoublePrice =0.0; - }; +  A classDisc_quote: Publicquote{ at  Public: -Disc_quote () =default; -Disc_quote (Const string&book,DoubleSales_price, size_t Quan,Doubledis): Quote (book, Sales_price), Quantity (Quan), Discount (dis) {} -     DoubleNet_price (size_t N)Const=0; - protected: -size_t quantity =0; in     DoubleDiscount =0.0; - }; to  + classBulk_quote: PublicDisc_quote { -  Public: theBulk_quote () =default; *Bulk_quote (Const string& Book,DoubleP, size_t qty,Doubledisc): Disc_quote (Book, p, qty, disc) {} $     DoubleNet_price (size_t N)Const Override;Panax Notoginseng }; -  the classLim_discount: PublicDisc_quote { +  Public: ALim_discount () =default; theLim_discount (Const string& Book,DoubleP, size_t qty,Doubledisc): Disc_quote (Book, p, qty, disc) {} +     DoubleNet_price (size_t N)Const Override; - }; $  $ DoublePrint_total (ostream& OS,Constquote&item, size_t t); -  - intMain () the { -Bulk_quote B1 ("C + + primer",128.0,Ten,0.60);WuyiLim_discount L1 ("C + + primer",128.0, -,0.9); thePrint_total (cout, B1, One); -Print_total (cout, B1,9); WuPrint_total (cout, L1, +); -Print_total (cout, L1, +); AboutSystem"Pause"); $     return 0; - } -  - DoublePrint_total (Ostream & OS,ConstQuote &item, size_t t) A { +     DoubleRET =Item.net_price (t); theOS <<"ISBN:"<< ITEM.ISBN () <<"# Sold:"<< T <<"Total Due:"<< ret <<Endl; -     returnret; $ } the  the DoubleBulk_quote::net_price (size_t N)Const the { the     if(N >=quantity) -         returnn * (1-Discount) *Price ; in     Else the         returnn *Price ; the } About  the DoubleLim_discount::net_price (size_t N)Const the { the     if(N <=quantity) +         returnn * (1-Discount) *Price ; -     Else the         returnQuote::net_price (n);Bayi}

Exercise 15.17

1>f:\c++projicets\project1\project1\ source. cpp: Error C2259: "Disc_quote": Cannot instantiate abstract class
1> f:\c++projicets\project1\project1\ Source. cpp: NOTE: Due to the following members:
1> f:\c++projicets\project1\project1\ Source. cpp: NOTE: "Double Disc_quote::net_price (std::size_t) const": Abstract
1> f:\c++projicets\project1\project1\ source. CPP (+): note: See the "Disc_quote::net_price" statement
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C++primer 15.4 Exercises