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