网上超市购物结算功能模拟

用户每购买一种商品就在购物车中添加一条信息，添加的信息包括商品名称、数量和单价

2．用户可以删除已购买的某一种商品

3．用户可以查询已购买的一种商品的详细信息，查询时要指明查询的商品的记录号是多少（商品记录号是按照商品购买次序编的），还可以指定查询第一个或最后一个购买的商品信息。

4．用户可以删除所有已添加到购物车的商品

5．用户可以打印要购买的商品的清单

6．用户可以清空显示信息的窗口

7．用户可以要求结帐，系统会打印出用户购物清单，并给出总价。-Online supermarket shopping clearing functions simulate user for every purchase of a commodity in the shopping cart Add a message add information includes product name, quantity and unit price. Users can delete a commodity purchased. Users can query the purchase of a commodity, the record number of commodities query to specify query (record number of goods are compiled in accordance with the product purchase order), you can also specify the query first or last purchased Product information. 4. The user can delete all the items have been added to the shopping cart 5. Users can print to purchase goods in Listing 6. The user can clear the information window 7. The user can ask the checkout, the system will print out the user' s shopping list, and given the total price.