文件读写

//读出图书信息
//将stdin与文件绑定
freopen("./account/books.dat","r",stdin);
//读入书本的数量
int num = 0;
cin >> num;
//读书书本信息到容器中
for(int i = 0;i < num;i++)
{
    Book tmp;
    cin >> tmp.m_name;
    cin >> tmp.m_author;
    cin >> tmp.m_id;
    cin >> tmp.m_loan_id;
    cin >> tmp.m_engage_id;
    cin >> tmp.m_type;
    cin >> tmp.m_loan_times;
    cin >> tmp.m_time;
    books.push_back(tmp);
}
    
fclose(stdin);
//将stdin与终端绑定
freopen("/dev/tty","r",stdin);

//保存图书信息
//将stdout与图书文件绑定
freopen("./account/books.dat","w",stdout);
//写入书本的数量
cout << books.size() << endl;
//写入书本的信息
for(unsigned int i = 0;i < books.size();i++)
{
    cout << books[i].m_name << endl;
    cout << books[i].m_author << endl;
    cout << books[i].m_id << endl;
    cout << books[i].m_loan_id << endl;
    cout << books[i].m_engage_id << endl;
    cout << books[i].m_type << endl;
    cout << books[i].m_loan_times << endl;
    cout << books[i].m_time<< endl;
}
fclose(stdout);
//将stdout与终端文件绑定
freopen("/dev/tty","w",stdout);