I wonder if I should also tag this C++ also. The answer might be different for these different languages. But the question is going to be exactly the same.

Estela‭ C and C++ are two distinct languages that happen to use partly similar syntax, in no small part due to a shared history. My firm opinion is that, despite the common usage of "C/C++" and that the two sometimes have very similar semantics, they should not be casually lumped together any more than, say, C++ and C# should be casually lumped together just because they share syntactic elements and at times even semantics.

Indeed they are distinct. Different is the word I used. The common "Do you know C/C++?" question is way missguided. They are however way closer than C++ and C#. The similarity goes beyond sometimes having similar semantics. The C++ language standard specification references the C specification. See section "1 Scope" of the C++ standard. The C++ standard also states "With the qualifications noted in Clause 17 through Clause 32 and in C.6, the C standard library is a subset of the C++ standard library". So, with those qualifications, knowledge of parts of the C standard is relevant for C++. The opposite is not true though, the C standard does not reference the C++ standard. So I was not casually lumping them together. However, the opposition to C++ tag I was expecting is happening. So I will refrain from that.