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It's not just a couple. There are a large variety of things in C that Cxx does not support at all (e.g., VLAs and _Generic), and many more things that, though they are in both languages behave very differently (e.g., sizeof).

It's fine for people to like Cxx, but I do wish we could stop perpetuating the falsehood that C is just a subset of Cxx. Cxx, when it started was a pure superset of C, but that is no longer the case.

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Alright, I'll rephrase. There are a zillion differences, but with a couple of minor exceptions, there is very little C++-incompatible C that cannot be straightforwardly expressed as C++-compatible C. I mean, gcc -Wall even turns on -Wc++11-compat and -Wc++14-compat now.

Also, sizeof doesn't behave differently, the arguments that get passed to sizeof are different in a few cases, e.g. sizeof('x'). See Annex C:

http://www.lcdf.org/c%2B%2B/clauseC.html

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