作业4.20

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