I'm pretty sure you could use Dev-C++ as a c compiler...of course there is always gcc (but you'll need cygwin for that). And perhaps Codewarrior. Those are all good.
Just search google for each of those and you should find the free download of each.
Dev-C++ uses the gcc compiler, well it uses MinGW which uses GCC, which is essentially the same compiler that is in cygwin and most distros. of Linux. There are some differences between the cygwin gcc and MinGW but i develop under Linux and so have no interest/knowledge in what these are.
if you dont have an IDE then go for Dev-C++, its pretty good, and as mentioned it comes with a compiler so you dont have to mess around setting one up.
If you have an environment to work in, then you'll either have to figure out some way of getting it to talk to the compiler or install cygwin and use that to compile.
if i were you then i'd go for the dev-c++ option as it is much simpler
