 　　编写基于会话套接字进行通信的服务器端和客户端程序，要求：

 　　客户端以字符串的形式循环发送“data0”到“data9”到服务器端；

 　　服务器端收到每个字符串后，回应一个echo信号到客户端，格式为：“XXXXXXXX echo data0” （XXXXXXXX为学号）；

-　written communication session based socket server and client procedures, requirements: 　client as a string loop send " data0"　to " data9"　to the server　　server received after each string in response to an echo signal to the client in the format: " XXXXXXXX echo data0"　(XXXXXXXX is student number)