In the last episode (Oct 03), Larry Lile said:
>
> ...we get scores of warnings about using characters as subscripts
> to an array (-Wchar-subscripts), which generates so much noise as
> to mask real warnings burried within. Therefore, I would like to
> suppress this warning unless someone can explain why using a char
> as an array subscript is in any way an illegitimate thing to do.
> As far as I can tell, getting rid of the warning by changing the
> code would require adding a large number of frivolous casts to
> scores of source files...
>
> So why is using a "char" as an array subscript wrong? I had always
> avoided it because the compiler complained and that was good enough
> for me.
Because your char value could be negative and end up referencing memory
before your array start. Mainly a problem with the ctype macros and
high-ascii characters.
--
Dan Nelson
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