Re: do { quit; } else { }

James Kuyper <jameskuyper@alumni.caltech.edu> writes:

On 4/13/25 17:30, Michael S wrote:
...

My impression rfrom old books was that indexing as [i]arr was (is ?)
also legal.

>
If it had ever been legal, I would have expected it to be mentioned in
K&R 1st edition, in the section where it describes obsolete syntax that
used to be valid. It isn't.

It isn't mentioned there because the syntax isn't obsolete.

It's mentioned in K&R1 Appendix A section 14.3, page 210:

    By definition, the subscript operator [] is interpreted in such a
    way that E1 [E2] is identical to *((E1)+(E2)). Because of the
    conversion rules which apply to +, if E1 is an array and E2 an
    integer, then E1 [E2] refers to the E2-th member of E1. Therefore,
    despite its asymmetric appearance, subscripting is a commutative
    operation.

This is still true in all editions up to and including C23.

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