In the provided client.c and server.c program (please download from the folder socket programming), after the client receives This server has been contacted 1 time from the server, the client process exits.
Modify the client.c and server.c in this way: after the client receives This server has been contacted 1 times, instead of exit, the client sends back This client has been contacted 1 times to the server. The server then sends back This server has been contacted 2 times, the client sends back This client has been contacted 2 times to the server, and so on. That is, both the client and the server do not exit. They alternatively send messages to each other.
