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From: Keith Thompson <Keith.S.Thompson+u@gmail.com>
Newsgroups: comp.lang.c
Subject: Re: do { quit; } else { }
Date: Sun, 13 Apr 2025 14:52:28 -0700
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Michael S <already5chosen@yahoo.com> writes:
[...]
> The funny thing is that in original C prefix form of [] indexing was
> equivalent to the postfix form.  May be, it still is in C23, I didn't
> try to look in the docs or test.
> However in type declarations one always had to use only postfix form.

If you're referring to the equvalence of a[i] and i[a], that's still
there in C23.  I wouldn't call either of them "prefix form".

The standard classifies indexing as a postfix operator.  You can think
of it as postfix, where a is the operand and [i] is the operator, or as
an operator that takes two operands and uses a weird syntax that's not
really either prefix, postfix, or binary:

    operand1 '[' operand2 ']'

But you make an interesting point: the imperfect mapping of expressions
to declarations does not include the case where the prefix of [] is an
integer.  (And I definitely don't have a problem with that.)

-- 
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
void Void(void) { Void(); } /* The recursive call of the void */