Re: Subtypes with Combined Ranges

[Jacob Sparre Andersen <sparre@nbi.dk>]

David Rasmussen wrote:

> An Ada-excercise reads as follows:
> 
> 6.1 Write a program to count the number of occurrences of each letter of 
> the alphabet typed as input at the keyboard. Using a subtype of 
> Character as the index subtype of an array is a sensible way to do this.
> 
> My first thought was to do this:
> subtype Alphabetical is Character range 'A'..'Z' | 'a'..'z';

I think your problem is that you misunderstand the exercise. 
"The alphabet" is just 'a' to 'z' and case insensitive. But 
since the alphabet actually is 'a' to '�', and not just 'a' 
to 'z', the advise in the exercise is inapropriate for other 
languages than English and Latin.

I would assume that the alphabet considered by the user is a 
subset of the type Character, but include all elements of 
type Character (converted to lower case) in the histogram, 
and not worry about which elements to show until printing 
out the histogram.

Jacob
-- 
"Any, sufficiently complicated, experiment is 
indistinguishable from magic."