title

///程序启动

///1 读取 | 2 保存 | 3 打印 | 4 查询 | 5 添加
///6 修改 | 7 删除 | 8 排序 | 9 图表 | 0 退出

///请选择： 0 
///确定要退出吗？(Y/N):  no



book

for example
::
Commands: (1) Add, (2) Find, (3) Delete, (4) Print, (0) Exit
Enter your choice (0-4): 1
ID    : 101
TITLE : The C Programming Language
AUTHOR: K&R
PRICE : 35.98
Book { id: 101, title:"The C Programming Language", author: "K&R", price: 35.98 }
Added



student

id
name 
class
date