Sure, it could mean that... It could also mean the person was just lazy and is actually a master of both. Actually I think the pessimistic interpretation is tha

Sure, it could mean that... It could also mean the person was just lazy and is actually a master of both. Actually I think the pessimistic interpretation is that they know one in terms of the other (typically whichever came first in their lives) and know neither very well... I just tend to run into more people who fall into the "pretty good with C programming and thinking style and use C++ mostly as C with classes" bucket than the "pretty good with C++ and can confidently(!?) use C" bucket. For a shaky analogy, C is to C++ as freshman algebra is to freshman calculus...