i'm doing my final year project using pic16f877a and using transmitter n receiver using RF signal..the problem is how to coding it using C programming...i'm using 4 transmitter consist 6 switch and receive it with 4 receiver...

 

Got a schematic?

 

what about googling some pic C tutorial, if you never used it?

 

That's something I would have thought about before choosing a micro controller project.
There are a million C tutorials on-line.. This is YOUR project.. YOU need to learn the code if you choose to go that route.

 

You need to do it with RF transceivers ,their are many in market with different

wireless networking protocols like ZigBee,MiWi P2P,Bluetooth and etc... it depends on you i.e.. which you want to use.

From your question it seems that you are not comfortable with the language "C" so as kubeek said have a google search for "C" tutorial's and after that its not too hard to be able to communicate with a transceiver chip ,just download the datasheet for the chip and you will get the details in it.

Good Luck​