9.cpp

<img src="https://img-blog.csdn.net/20150419170526210" alt="" />#include <iostream> 
using namespace std; 
class Product
{ public:
       Product(int n,int q,float p):num(n),quantity(q),price(p){}; 
       void total();
       static float average();
       static void display();
 private: 
       int num; 
       float quantity; 
       float price;
       static float discount;
       static float sum;
       static int n;
}; 
void Product::total()
{
	float rate=1.0;
	if(quantity>10)rate=0.98*rate;
	sum=sum+quantity*price*rate*(1-discount);
	n=n+quantity;
}
void Product::display()
{
	cout<<sum<<endl;
    cout<<average<<endl;
}
 float Product::discount=0.05;
 float Product::sum=0;
 int Product::n=0;
 int main()
  {
     Product Prod[3]=
     {Product(101,5,23.5),Product(101,12,24.56),Product(103,100,21.5)
	 };
	 for(int i=0;i<3;i++)
	 Prod[i].total();
	 Product::display();
	 return 0;
  }
  


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