This is a simple client-server model where a client program can chat with a dummy math server. The communication between client and server goes as follows:

• The server gets started first and listens to a known port.
• The client program is started as server IP and port is provided in the command line.
• The client connects to the server and asks for user input. The user enters simple arithmetic expression as “7+5”,"5*3","10/2" or “10-2”. The input is sent to the server through connected socket.
• The server receives the input from the client socket, evaluate the expression and sends the result back to the client.
• The client should display the result from the server to the user and prompts for the next input, until the user terminates the client program by Ctrl+C.

Server program Server.c is a single process server that can handle only one client at a time. An client program is in client.c

Server program Server.c is a multi-process server that forks a process whenever it receives a new client request. Multiple server will be able to chat with the server concurrently. An client program is in client.c

First start the server then client can be connected....

• Server:
  -> gcc server.c -o server
  ->./server [port no.]

• Client:
  -> gcc client.c -o client
  -> ./client 127.0.0.0 [port no.]

Note: port number for client and server should be same.