说明：  麻雀虽小，五脏俱全加强版聊天室，源码来自网上搜得的，增加用户登录密码检查，聊天信息记录功能，版权归原作者所有，我只是修改下玩。在终端下执行，没有图形界面，没有创建子进程，利用int型数组保存客户accept套接字
(Sparrow may be small, fully-equipped enhanced version of chat rooms, source gathered from the Internet, and increase user login password checking, chat information recording function, belongs to original author, I just change the next play. Executed in a terminal, there is no graphical interface, did not create the child process, using an array of int type to save customers accept socket)