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。可以建立航班结构体，结构体成员包括航班号、起点站、终点站、飞行时间、预售票总数、已售票数。
(Design flight information, storage structure, the design process is completed booking information function. Flights structure can be established, the structure members including flight numbers, the starting station, terminal, flight time, the total number of pre-sale tickets, sold the votes.)