It's pretty rare to use C. Usually you only need it if you are concerned about program size. C++ is just an extended version of C, and can do all the same things, and then some. If you want to ultimately learn C++, then you may as well start with that, but it really doesn't matter.
"We can categorically state that we have not released man-eating badgers into the area."
-UK military spokesman Major Mike Shearer