（1）使用两个不同的结构体分别保存货物信息和购物车中的商品信息，可在商品信息结构体中嵌套货物信息结构体。

（2）将货物信息写入文件保存，在每次运行时，货物信息可以从二进制文件中导入，并在结算后更新。

（3）建立一个链表保存购物车信息，可以实现商品的添加和当前购物列表的显示-(1) uses two different structures were preserved cargo information and shopping cart of merchandise information, cargo information structure can be nested in the commodity structure of information.

(2) to save the cargo information written to the file each time it runs, cargo information can be imported　a binary file, and after the settlement date.

(3) Establish a list Saved Carts information that can be realized commodity add and display the current shopping list