模拟同学排队打饭程序，只允许在队尾排队不允许插队。记录的学生信息可简可繁例如：学号，姓名，金额，消费总额等。实现学生排队、打饭、充值、查询（按学号和姓名）、删除（学号）、按消费总额排序等操作-Simulation of class queue Dafan program, allowing only at the end of the line is not allowed to jump the queue queue. Record student information can be si