模拟实现超市pos机，可以实现对商品的属性、出入库管理购买时间等操作。-Analog realization of the supermarket pos machine, you can realize the value of the property, the storage management operations to buy time.

家用电器商店库存操作模拟程序，完成商品的卖出，退回，查询功能以及保存交易记录的功能，并将交易记录保存到磁盘中，并可以查询交易记录-Appliance store inventory operation simulation program, complete the goods sold, returned, query functions and features keep transaction records, and transaction records saved to disk,

简单的商品销售系统，该系统可以实现商品信息的输入，查看，修改，删除等操作，以及可以进行购买商品等模拟操作-Simple commodity distribution system, the system can input product information, view, modify, or delete operation, and can buy goods such as simulated operation