这个程序是用C语言实现的。我使用了单向链表来实现对药品的增加. 删除等操作. 我修改了几次算法，

优化了一下. 如果有不足之处，还望各位多多指点。



设计目的:

这是一个专为小药店设计的药品管理系统. 可以对药品自由的进行添加、删除、查找等操作.



功能简介:(每个数字键对应相应的功能, 按数字键后，请按Enter键)

"1 - 增加药品": 向系统增加一种药品

"2 - 删除药品": 删除系统中的一种药品

"3 - 查找药品": 输入药品的名称或编号, 如果找到了就显示药品信息

"4 - 更新药品": 增加或减少某种药品的数量

"6 - 显示药品列表": 按大小显示所有的药品的信息

"7 - 显示销售记录":显示每日或每月的销售记录

"8 - 修改密码": 更改登陆系统的密码

"0 - 退出": 退出系统。

退出时，程序自动保存数据.-this procedure is the C language. I use the one-way linked list of drugs to achieve the increase. Deleted operation. I revised the number algorithm, Optimizing a bit. If there are deficiencies, I would like to make instructions. Design Objective : This is a small shop for the design of drugs management system. Drugs can be added for free, delete, searching operation. Functional Descr iption : (each corresponding figures for the corresponding key functions, according to key figures, Click the Enter key) "1-increase Drugs" : the system to increase a drug "2-Delete Drugs" : removal system of a drug "3-find drugs" : the importation of drugs the name or number. If found information on the drugs showed that the "4-Update Drugs" : increase or reduce the numb