1、实现对货品信息的输入和查询。 2、能根据货品的输入代码统计货品价格。 3、能对十个货品的价格统计并显示清单。 4、具有找零功能！-1, the realization of goods enter and query information. 2, based on statistics of goods are imported into the code prices. 3, can the price of the goods 10 and displays a li