UDP套接字编程

代码说明：

  可通过U D P套接字及接口函数发送/接收数据 1. 在Linux系统下，采用C语言编写一个U D P服务器程序，客户向服务器发送字符串后，服务器能把该字符串返回给客户程序。 2. 在Linux系统下，采用C语言编写一个U D P客户程序，可向服务器发送字符串，并把服务器返回的字符串显示出来。(Data can be sent / received through U D P sockets and interface functions. 1. In Linux system, a U D P server program is written in C language. After the client sends the string to the server, the server can return the string to the client program. two. Under the Linux system, a U D P client program is written in C language,which can send a string to the server and display the string returned by the server.)