C - Re: comp.lang.c FAQ list

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Re: comp.lang.c FAQ list · Question 7.19b

Harald van Dĳk

2006-02-26, 6:55 pm

Keith Thompson wrote:
> Actually, C99 says
>
> If the type of the operand is a variable length array type, the
> operand is evaluated; otherwise, the operand is not evaluated and
> the result is an integer constant.
>
> But I can't think of a case where "evaluating" a variable length array
> has any effect other than determining its size (quite possibly I'm
> missing something).

How about this?

#include <stdio.h>
int main(int argc, char *argv[]) {
char vla[argc];
sizeof((&vla)[(puts("..."), 0)]);
}

Is that supposed to print something, then, or is there an exception for
this elsewhere? Or am I missing something that means the text does not
apply to this in the first place?

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