#include 
     
      #include "buy.h"#include "book.h"using namespace std;class order{private:    int orderID;    int buyerID;    int listcount;    string orderlist[20];    static int ordercount;public:    order(buyer &person, book &b[], int bookNumber)    {        ordercount++;        orderID = ordercount;        buyerID = person.buyerID;        listcount = bookNumber;        for(int i = 0; i < bookNumber; i++)        orderlist[i] = b[i].book_ID;    }    void show()    {        cout << "订单编号： " << orderID << "\n购书人编号： " << buyerID << "\n购书数量： " << listcount << endl;        for(int i = 0; i < listcount; i++)        cout << "书号： " << orderlist[i] << endl;;    }};int order::ordercount = 0;int main(){    book *c[20];    book c1("7-302-0145214-6", "C程序设计", "谭浩强", "清华", 25);    book c2("7-302-0145214-7", "C++程序设计", "谭浩强", "清华", 28);    c[1] = &c1;    c[2] = &c2;    layfolk b1("林晓茶", 1, "北京", 0);    order ord(b1, c, 2);    order.show();    return 0;}