说明：  （1）录入班次信息(信息用文件保存),可不定时地增加班次数据 （2）浏览班次信息,可显示出所有班次当前状总(如果当前系统时间超过了某班次的发车时间,则显示“此班已发出”的提示信息)。 （3）查询路线：可按班次号查询 ,可按终点站查询 （4）售票和退票功能 A：当查询出已定票人数小于额定载量且当前系统时间小于发车时间时才能售票，自动更新已售票人数 B：退票时，输入退票的班次，当本班车未发出时才能退票，自动更新已售票人
((1) Input frequency information (information stored with the file), may from time to time to increase the frequency of data (2) Browse the frequency information can show all shifts like total (if the current system time over the departure time of a shift, it shows " This class has been issued a " message). (3) line: according to frequency of queries, according to the terminal query (4) ticket and refund functions A: check out the number of tickets is less than the rated load and the current system time is less than the departure time ticket automatically update the ticket number B: a refund, enter the frequency of the refund, when the shuttle is not issued to refund, automatic update has been ticketing people)