#include <iostream>
#include<string>
using namespace std;
class bookscard
{
public:bookscard(string a ,string b)    //建立创建借书用户构造函数{name = a;id = b;};bookscard()    //建立创建借书用户构造函数{name = "";id = "";};void borrowbook(int n)          //借书函数{books = n;sum -= n;};static void set()              //创建静态函数{cout << "图书总数：" << sum<<endl;};void returnbook()               //还书函数{sum += books;books = 0;};void read() {cout << "姓名：" << name << endl;cout << "id:" << id << endl;cout << "借书数目：" << books << endl;cout << "书库数:" << sum << endl;};private:static int sum;string name;string id;int books=0;};
int bookscard::sum = 100;int main()
{bookscard *p = new bookscard[3];   //对象数组的创建p->read();(p + 1)->read();p[2].read();delete p;return 0;
}