定义一个图书类（Book）
#include <>
#include <iostream>
using namespace std;
class Book
{
public:
Book(string book, string writer, int num, int money);
Book();
void bring();
void ret();
void show();
private:
string book;
string writer;
int num;
int money;
};
Book::Book(string book, string writer, int num, int money)
{
this->book = book;
this->writer = writer;
this->num = num;
this->money = money;
}
Book::Book()
{
book = "未命名";
writer = "佚名";
num = 0;
money = 0;
}
void Book::bring()
{
if (num <= 0)
cout << "借阅失败";
else
num--;
cout << book << "剩余" << num << "本" << endl;
}
void Book::ret()
{
num++;
cout << book << "剩余" << num << "本" << endl;
}
void Book::show()
{
cout << book << "作者：" << writer << money << "剩余" << num << "本" << endl;
}
int main()
{
Book book1("人类简史", "赫拉利", 68, 10);
Book book2;
book1.show();
book2.show();
book1.bring();
book1.bring();
book2.bring();
book2.ret();
book1.show();
book2.show();
return 0;
}