4.20

#include <iostream>
using namespace std;
class book{
	float qu;
	float price;
public:
	book(float qu1,float price2);
	void show();
};
book::book(float qu1,float price1)
{
	qu=qu1;
	price=price1;
}
void book::show()
{
	cout<<"qu*price="<<qu*price<<endl;
}
int main()
{
	book b[5]={
		book(1,10),
			book(2,20),
			book(3,30),
			book(4,40),
			book(5,50)
	};
	book *p;
	p=&b[4];
	for(int i=0;i<5;i++,p--)
		p->show();
	cout<<"*************************"<<endl;
	for (int t=0;t<5;t++)
		b[t].show();
	return 0;
}