通过此系统可以实现如下功能：

1、录入航线信息

　　每条航线信息包括航班号、飞机号、目的地、订票数、余票数共5项。假设现在有3条航线, 目的地分别是北京, 上海, 广州, 飞机上可乘坐100人( 即初始订票数为0, 余票数为100) , 将这3条航线信息存入文件中。

　　 2、订票业务

　　客户信息包括姓名, 航班号, 座位号(初始为0), 假设已有3个客户信息存入文件中。

　　3、退票业务

　　根据客户提出的航班号, 办理退票, 并删除该客户的信息, 并修改相应航线的订票数和余票数。

　　4、修改航班信息：当航班信息改变可以修改航班数据文件。

　　5、输出全部航线信息和全部客户信息。

　　6、退出系统。-This system can achieve the following functions: 1, entry route information for each route information including flight number, flight number, destination, booking number, I votes 5. Suppose now that there are three routes, destinations are Beijing, Shanghai, Guangzhou, on the plane can take 100 people (ie the initial booking number is 0, I votes to 100), these three routes information into the file. Booking business customer information including name, flight number, seat number (initially 0), assuming three customer information is stored in the file. 3, refund business according to customer' s flight number, refund, and delete the customer information, and modify the corresponding airline booking number and I votes. 4, modify the flight information: flight information changes can modify the flight data files. 5, the output of all the route information and customer information. 6 out of the system.