If you’re not familiar with both languages, you might have heard people say that C++ is a superset of C. If you’re experienced in both languages, you’ll know that this is not true at all.
Of course, C++ has many features that C does not; but there are also a few features that only C has. And, perhaps most importantly, there is code that compiles in both languages but does different things.
Hannah McLaughlin (source below)