代码完成的功能有：向客户显示本餐厅的菜谱，客户根据菜谱点菜，客户点完菜后上菜，客户结束用餐后结账，退出系统-Code completion functionality: the restaurant' s recipes, serving customers based on a meal a la carte, customers point to the customer, the customer end of the meal after checkout, exit the sy