Not necessarily -- I've interviewed plenty of people where "C/C++" meant "experienced in both, but most work was in C with a small smattering of C++" (or vice versa).

In my experience, it breaks roughly between half that and half recent graduates who took one C course and one C++ course.

For me, I see “C/C++” as a sign they see C++ (which I’m looking for experience in) as interchangeable with C. I want people who grok C++’s ability to build powerful abstractions, not people messing around with it as C with polymorphic classes.

Yes. "C/C++" on a résumé is a red flag.

"Next!"