I know they're different, but they're still close enough to use C code in your C++ projects.
And for my limited knowledge of C++, it still "feels" like an extended C.
I'm not claiming I know a hell of a lot about either - just that I know enough, for both to give me power and possibilities way beyond any other language :)
The core semantics of the two are kept in close correspondence as new versions of the standards come out. There are a few points where C and C++ disagree on things that they have in common, but C programs will almost always compile as C++.
I would definitely like to learn more C++, when time allows, but as things are right now, I guess you can say, I use C++ as the easier C, regardless of how different they are underneath.
Someone joked by saying, it's like using JavaScript as the easier Java... Well... I get the idea, but C can compile with C++ programs, making it much more of a subset of C++, which I can re-use.
That makes it a "no cost" tool to fall back on, when C++ is not available/possible.
And for my limited knowledge of C++, it still "feels" like an extended C.
I'm not claiming I know a hell of a lot about either - just that I know enough, for both to give me power and possibilities way beyond any other language :)