I am not remotely interested in what the ISO standard says about C, and I am even less interested in what the ANSI standard says about C++, a completely differe

I am not remotely interested in what the ISO standard says about C, and I am even less interested in what the ANSI standard says about C++, a completely different language. C is not defined by or constrained to the standard. It predates it and every implementation extends it, as is intended by the standard. The person confusing the standard with the language is you.