is there any book which can give me programs on client-server programing in c
ex:
Write and run a client and a server program using C - language in UNIX with the 15
following specification :
• UDP client should send two strings to a UDP server.
• UDP server will concatenate both the strings and send to the client. The clientprogram prints the result.

Hi, welcome to LQ

We have a rule here, we don't do assignments. But in your case, as you request information about the subject, we will be happy to help you on that. There is many way to solve your problem. There is both low and high level APIs to do this. The low one, the one I am assuming you need to use, is called POSIX. Doing some basic UDP code does not require reading tons of books. Just google "udp socket C linux" and you will get plenty of ressources. First, learn how to compile a basic "Hello world!" C application with GCC and a makefile to setup your environment for development if it's not already done). Do it in command line, but thee is also many IDEs that can automate much of the process.

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Read and learn http://beej.us/guide/bgnet/

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thanks.this is not my assignment question it was just an example.actually client-server program is totally new for me.I am studying by correspondence and I neither have any teacher to explain nor any lab for practice. we don't have any list of questions I got this question from last year question paper.you will be surprised I don't know to connect client & server so that they can communicate.thanks again.
can we have client & server on same computer?

yes, you can have the client and server on the same computer. you probably want to have your client create a socket connection to your server (they can be different machines or the same machine -- be careful of firewalls, security policies, and antivirus programs). your server will need to create a listening socket and wait for connections.

If you want a book, this one is pretty technical, but probably explains everything:
http://www.amazon.com/Unix-Network-P.../dp/0131411551