From: Simon Wright <simon@pushface.org>
Subject: Re: Checking to see if a string is a letter
Date: Tue, 03 Apr 2012 09:26:40 +0100
Date: 2012-04-03T09:26:40+01:00 [thread overview]
Message-ID: <m2k41xi5kv.fsf@pushface.org> (raw)
In-Reply-To: jle43k$qcc$1@dont-email.me
deuteros <deuteros@xrs.net> writes:
> On Tue 03 Apr 2012 01:15:27a, Jeffrey Carter
> <spam.jrcarter.not@spam.not.acm.org> wrote in
> news:jle13q$ale$1@tornado.tornevall.net:
>
>> What do you mean by "contains a single letter"?
>
> I mean the string contains a single letter and nothing more. For
> example:
>
> a - Legal
> A - Legal
> aa - Illegal
> a1 - Illegal
Then for a start the length of the string needs to be 1.
If it is, the first (and only!) character needs to be a lower- or
upper-case letter. There are (at least) three ways of doing this:
* declare an array of Boolean indexed by Character, with the elements
indexed by letters set to True and the others to False, and index by
the character to be tested;
* declare two subtypes of character ("Character range 'a' .. 'z'", for
instance) and check whether the character to be tested is 'in' either
of the subtypes;
* use the standard library, Ada.Characters.Handling.Is_Letter (probably
the easiest for you!)
next prev parent reply other threads:[~2012-04-03 8:26 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-03 2:11 Checking to see is a string is a letter deuteros
2012-04-03 4:18 ` Leo Brewin
2012-04-03 4:52 ` Checking to see if " deuteros
2012-04-03 5:15 ` Jeffrey Carter
2012-04-03 6:07 ` deuteros
2012-04-03 6:47 ` Gautier write-only
2012-04-03 12:55 ` deuteros
2012-04-03 14:19 ` gautier_niouzes
2012-04-03 8:26 ` Simon Wright [this message]
2012-04-03 12:56 ` deuteros
2012-04-03 13:46 ` Dmitry A. Kazakov
2012-04-05 17:12 ` deuteros
2012-04-05 17:24 ` Martin Dowie
2012-04-05 18:04 ` deuteros
2012-04-05 18:18 ` Adam Beneschan
2012-04-05 18:56 ` Simon Wright
2012-04-03 20:40 ` Jeffrey Carter
2012-04-03 7:09 ` Checking to see is " Thomas Løcke
replies disabled
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox