For people who aren't professionally familiar with C or C++ it's an easy mistake to make considering how often things refer to "C/C++" like they are a single skill.
Example: https://sjobs.brassring.com/TGWebHost/jobdetails.aspx?jobId=...
Example: https://sjobs.brassring.com/TGWebHost/jobdetails.aspx?jobId=...
At that time mixing C and C++ was trivial, especially because C++ was still quite simple and the C compiler was the target.
But after that things got more complicated. C evolved, several times in fact since that time and the C++ standard evolved as well. Leading to the impression that C and C++ are merely the old and the improved version of C but it is probably much better to think of them as two distinct species that share a common ancestor, where one of the two had some very radical mutations.
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