用C语言写的基于udp的socket通信小程序。分客户端服务器端，先运行服务器端，可同时运行多个客户端，客户端都可以和服务器聊天，还可以从服务器下载文件-Udp socket-based communication applet written in C language. Sub-client server-side, the first to run server-side, and can simultaneously run multiple clients, the client an