C/C++

So my question is simple ; of the two which would be advisable to learn first.

All the C++ books tell me to learn C++ over C ,but on the internet im told that learning C gives better grasps of concepts.

Which should i learn first and why?

D makes a very nice substitute to C++--. Its main problem is that it's so new that the language is still in flux, but they finally seem to be making a push for 1.0. If you're a system programmer it's worth playing around with.

Unrelated, but >>7 probably faps to STL and cums over boost. Yeeeeeech.