4.20

#include<iostream>using namespace std;class book{public:book(int qu1); void show();private:int qu;int price;};book::book(int qu1){qu=qu1;price=10*qu1;}void book::show(){cout<<qu*price<<endl; }int main(){   book *p;book b[5]={book(1),book(2),book(3),book(4),book(5)};p=&b[4];for(int i=0;i<5;i++,p--){p->show();}system("pause");return 0;}