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From: Tim Rentsch <tr.17687@z991.linuxsc.com>
Newsgroups: comp.lang.c
Subject: Re: Two different Results between C and C++
Date: Thu, 10 Sep 2020 06:20:17 -0700
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James Kuyper <jameskuyper@alumni.caltech.edu> writes:

> On Thursday, September 3, 2020 at 2:00:54 AM UTC-4, Tim Rentsch wrote:
> ...
>
>> The bigger problem is C code that is legal C++ but has different
>> semantics in C++ than in C.  There are more of these than most
>> C or C++ developers think there are.  I don't know anyone,
>> including myself, who can say with confidence that they know
>> all the different ways that source code can have a different
>> meaning in C++ compared to C. ...
>
> Those ways are listed in Annex C.1 of the C++ standard.  [...]

Some are.  Some are not.