#include <iostream>

using namespace std;
class Book
{
private:
    char bookname[20];
    double price;
    int number;
public:
    Book(char *n,double p,int n2)
    {
        while(*n!=0)
        {
            int i=0;
            bookname[i]=*n;
            n++;
            i++;
        }
        price=p;
        number=n2;
    }

    void display();
    int borrow();
    int restore();
};
void Book::display()
{
    cout<<price;
    cout<<number;

}
int Book::borrow()
{
    number-=1;
    cout<<"当前存书数量";
    return number;
}
int Book::restore()
{
    number+=1;
    cout<<"当前存书数量";
    return number;
}
int main()
{
    char str[10]="abc";
    Book book1(str,10,40);
    book1.display();
    cout<<book1.borrow();
    cout<<book1.restore();
}

还有，怎样在display里除了输出price和number还输出bookname?