一个商场收银系统，累计上品的价格，最后要求输入顾客支付额，然后找回差价。-a shopping center cash register system, the price has multicolored, finally asked the customers to pay for the importation, and then back post.

交你怎么建立菜单，右键快捷菜单的建立，对话框菜单插入，易懂！-To pay how do you create the menu, right-click shortcut menu to create, the dialog menu insert, easy to understand!