Re: Char type verification

["Jeffrey R. Carter" <spam.not.jrcarter@acm.not.spam.org>]

KE wrote:
> 
> I understand that ".." is an operator that Ada coders are very fond of.
> But what if the "UCASE" array was not a set of contiguous values from a
> specific range?

Then it's simple to create an array of Boolean that is True for the 
appropriate values, and False elsewhere:

type Letter_Set is array (Character) of Boolean;

Is_Letter : constant Letter_Set :=
    ('A' .. 'Z' | 'a' .. 'z' => True, others => False);

Now

Is_Letter (C)

is equivalent to

C in 'A' .. 'Z' or C in 'a' .. 'z'

You can use a subtype if the values are contiguous, and you want to make 
the check repeatedly:

subtype Upper is Character range 'A' .. 'Z';

if C in Upper then ...

-- 
Jeff Carter
"From this day on, the official language of San Marcos will be Swedish."
Bananas
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