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航空售票处的服务系统（7） 任务：通过此系统可以实现如下功能： 录入：可以录入航班情况（数据可以存储在一个数据文件中，数据结构、具体数据自定） 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； 订票：（订票情况可以存在一个数据文件中，结构自己设定） 可以订票，如果该航班已经无票，可以提供相关可选择航班； 退票：可退票，退票后修改相关数据文件； 客户资料有姓名，证件号，订票数量及航班情况，订单要有编号。 修改航班信息：当航班信息改变可以修改航班数据文件。 要求：根据以上功能说明，设计航班信息，订票信息的存储结构，设计程序完成功能。-Air ticket service systemTask: The system can be achieved through the following functions:Entry: You can input flight conditions (data can be stored in a data file, data structure, specific data from the set)Enquiries: You can query a route (such as, enter the flight number, the query time taking off and landing, taking off from the city, flight fares, fare discounts, to determine whether the full-flight position) You can enter to take off from the city, check flight conditions Reservations: (booking conditions for the existence of a data file, structure, set their own)Can book your tickets, if the flight has been without a ticket, you can choose to provide flight Refund: Refund available, a refund after the revision of the related data files Customer information with names, identification number, booking number and flight conditions, the order must be numbered.Modify the flight information: When the flight information changes can modify the flight data files.Requir
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