I am used to write my code using PicBasic Pro.

I am finding many suitable programs for my PC16F876A but they are all written in C language!

so can i just copy the programs and paste them directly in PicBasic Pro workspace?
No you can't cut & paste C code into PBP programs.

or i need a certain new program?
You will need the C compiler your code examples were written for.

in case i need a new program (compiler) would anyone be able to give me a download link?
Once you know which C compiler was used to create the code examples you
have, then you'll know which one to get.

Microchip has a free student version of the C18 C compiler;
http://www.microchip.com/stellent/id...&part=SW006011

Hi-Tech also has a free limited version C compiler;
http://www.htsoft.com

And there are quite a few more, but first you really want to find out which
one was used to create the examples you have.

You can always port your examples from one C compiler to another, but of
course you'll need to be somewhat familiar with C to do this.