I'm going to disagree with the majority here. I think you should learn C before learning C++. It's definitely not necessary, but I think it makes learning C++ a lot easier. C is at the heart of C++. Anything you learn about C is applicable to C++, but C is a lot smaller and easier to learn.
Pick up K&R and read through that. It is short and will give you a sufficient sense of the language. Once you have the basics of pointers and function calls down, you can move on to C++ a little easier.
