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飞机航班订票系统任务：通过此系统可以实现如下功能：（1）录入：录入航班信息（数据可以存储在一个数据文件中）（2）查询：可以查询某个航线的情况（如，输入航班号，查询起降时间，起飞抵达城市，航班票价，票价折扣，确定航班是否满仓）；可以输入起飞抵达城市，查询飞机航班情况；（3）订票：（订票情况可以存在一个数据文件中）可以订票，如果该航班已经无票，可以提供相关可选择航班；（4）退票： 可退票，退票后修改相关数据文件；订票的客户信息有姓名，证件号，订票数量及航班，订单要有编号。（5）修改航班信息：当航班信息改变可以修改航班数据文件。-Flight reservation system Task: The system can be achieved through the following functions: (1) Input: Input flight information (data can be stored in a data file) (2) query: You can query a route (such as, enter the flight number, the query taking off and landing , The departure from the city, flight fares, fare discounts, to determine whether full-flight position) You can enter to take off from the city, check flight conditions (3) Booking: (booking conditions can exist in a data file) You can booking, if the flight has been without a ticket, you can choose to provide flight (4) Refund: Refund available, a refund after the modified data file Booking customer information with name, ID number, booking number and flight, the order must be numbered. (5) modify the flight information: when the flight information changes can modify the flight data files.
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