本文介绍了一个简单的图书销售系统中不同类型的图书折扣策略实现方法。通过基类`item_base`定义了基本属性和行为，并派生出`bulk_item`和`dls_item`两个子类来实现批量购买和动态区间折扣的功能。
#include <conio.h>
#include <iostream.h>
#include <string>
class item_base
{
public:
item_base(const std::string & book = "" ,double sale_price= 0.0):isbn(book),price(sale_price){}
virtual ~item_base(){}
std::string book()const {return isbn;}
virtual double net_price(std::size_t n){return n*price ;}
protected:
double price;
private:
std::string isbn;
};
class bulk_item:public item_base
{
public:
double net_price(std::size_t)const;
private:
std::size_t min_number;
double discount;
};
double bulk_item::net_price(std::size_t number)const
{
if(number>=min_number)
{
return number*discount;
}
else
{
return number*price;
}
}
class dls_item : public item_base
{
public:
dls_item(const std::string & book = "",double sale_price = 0.0,int min_num= 10,
int max_num=100,double dis_count=0.2 ):item_base(book,sale_price),min_number(min_num),
max_number(max_num),discount(dis_count){}
double net_price(std::size_t)const;
private:
int min_number;
int max_number;
double discount;
};
double dls_item::net_price(std::size_t number) const
{
if(number > max_number)
{
return (number-max_number)*price+max_number*(1-discount)*price;
}
else if(number<=max_number && number>= min_number)
{
return number*(1-discount)*price;
}
else
{
return number*price;
}
}
int main()
{
item_base temp("hehh",12.0);
getch();
return 0;
}
扫一扫
33万+
被折叠的 条评论
为什么被折叠?
到【灌水乐园】发言
