How to set .vimrc for c programs?

How should I set up my .vimrc so that macvim will set my tab to 4 spaces for c p开发者_开发知识库rograms?

This should do it

set cindent
set sw=4

EDIT: I did not read macvim in your question, so now it is like you can try above. This works in gvim for windows and vim in linux