CS360 LAB4 Pre-WORK
               DO it on your own, Nothing DUE
		   
               Network Programming using TCP

Download files from samples/LAB4pre/ :  server.c   client.c
The programs will be EXPLAINED and demonstrated in class

(1):
Modify client.c to send a line containing two numbers, e.g. 123 456
Modify server.c to compute the SUM of the numbers and reply 123 456 sum=579

(2): Modify server.c to be a multi-threaded server:
     When a client connects: fork a child:
		   
     Parent: close the client socket descriptor;
             continue for another client to connect;

     child : handle the client requests;
             exit(0) when client disconnects