I'm taking some programming classes again, and the school requires an introduction to the C programming language class. My many credits of C++ classes dont seem to proclude me from it, but I don't want to bore the hell out of myself in an introductory class. So, I'm going to take the final to avoid the course, only I've never used C, only C++.

My question would be, then, at an introductory level, what are the differences that one should know about? I figure they're mostly syntax, scan/print instead of cin/cout or stdio instead of iostream, but I'm really not sure.