本程序实现了电信计费系统查询操作功能，通过建立用户信息和话单的txt，实现对用户拨打的电话计费（本地及长途），并可以对用户进行插入删除更新等操作。-The program query operation of telecommunications billing system, through the establishment of user information and then single txt, the user dials the telephone billing (local