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From: Georg Bauhaus <sb463ba@l1-hrz.uni-duisburg.de>
Newsgroups: comp.lang.ada
Subject: Re: questions from a newbie
Date: Thu, 15 Jul 2004 14:44:39 +0000 (UTC)
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Date: 2004-07-15T14:44:39+00:00
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zork <zork@nospam.com> wrote:
: 
: if c in 'A'..'Z' or c in 'a'..'z' or c in '0'..'9' then
: 
: 
: if c in ('A'..'Z', 'a'..'z', '0'..'9') then

This is the purpose of Ada.Strings.Maps etc.
In Ada.Strings.Maps.Constants you will find predefined
Character_Set constant that match yours.

: Also, I know you can do the following:
: 
: type new_type is array(1..20) of string(1..50);
: words : new_type;
: index : integer := 20;
: words (15) (index ..index) := "K";
: 
: however I find that I cannot instead say:
: 
: words(15)(index):="K";
: 
: why is this so?

...(index) denotes a Character, one component of an array,
...(index .. index) denotes an array slice.
The index values can in general be results of computations at
runtime, i.e., ...(n .. m).  What kind of thing other than
an array slice should (n .. m) denote? OTOH, ...(n) where n
is an index value cannot but denote one array component.

: I get a "Type mismatch in assignment statement, continuing"
: error. It does however work when I use words(15)(index):='K'. The rational
: behind this is that (index..index) represents a range - hence a string -
: whereas (index) represents a single character?