void Menu::borrowPage(Readerdata *readerdata,BookDB *bookdb)
{
int reader_num;
int book_num;
Reader *r;
Book *b;
cout << "***************************************************" << endl;
cout << " 借阅者编号：" ;
cin >> reader_num;
r = readerdata->search_rnum(reader_num);
if (r == NULL)
{
cout<<"Sorry, 该借阅者不存在！"<<endl;
}
else
{
cout << " 请输入所借图书编号：" ;
cin >> book_num;
b = bookdb->search_bnum(book_num);
if (b == NULL)
{
cout<<"Sorry, 该图书不存在！"<<endl;
}
else
{
if (b->borrowbook()==0)//onshelf标志量
{
cout << "对不起，该图书已借出，不能借书!"<< endl;
}
else
{
r->borrowbook(book_num);
cout << r->getrname()<<"借阅"<<"《"<<b->getbname()<<"》"<<"成功"<<endl;
}
}
}
}
