1．定义一个Book(图书)类，其数据成员有： 书名(bookname), 价格(price) 和存书数量(number)。成员函数有:显示图书的情况display；借书borrow:将存书数量减1；

#include<iostream>
#include<string>
using namespace std;
class book
{
private:
	string* p_1;//书名
	float price;//价格
	int number;//存书数量
public:
	book(string* p_2, float money, int shuliang);
	void display();//显示图书的情况
	int borrow();//将存书数量减1
	int restore();//将存书数量加1
};

book::book(string* p_2, float money, int shuliang)//从main传数值到book
{
	p_1 = p_2;
	price = money;
	number = shuliang;
}

void book::display()//显示图书的情况
{
	cout << "图书名字:  " << *p_1 << endl << "图书价格:  " << price << endl << "图书数量:  " << number << endl;
}

int book::borrow()//将存书数量减1
{
	return number -= 1;
}

int book::restore()//将存书数量加1
{
	return number += 1;//数量加1
}

int main()
{
	int a, b;
	string c;//输入图书名字
	cout << "请输入图书名字" << endl;
	cin >> c;
	book zhulei(&c, 20, 10);//把c的地址给指针
	cout << "图书的信息：" << endl;
	zhulei.display();//展示图书情况
	cout << "需要借书请输入1" << endl << "如果不借书请输入 0 " << endl << endl << endl;
	cin >> a;
	while (a != 0)//反复借书还书操作
	{
		cout << "要借一本西游记请输入1" << endl << "还一本西游记请输入0" << endl << "结束输入其他字符" << endl << endl << endl;
		cin >> b;
		if (b == 1)
		{
			zhulei.borrow();
		}
		if (b == 0)
		{
			zhulei.restore();
		}
		if (b != 1 && b != 0)
		{
			break;//结束语句
		}
		zhulei.display();
	}
	cout << "see you" << endl << endl << endl;
	return 0;
}