Re: Need Help On Ada95 Problem

["Alex" <alex@foo.invalid>]

This is a homework assignment and I think the translation lookup table
is provided as a string, not an array. As far as I know, there is no
way in Ada to make string indexing start at 0.

You're right, an array of chars indexed starting at 0 would be better,
but at this point of the course, I don't think they've covered arrays.
I think they use strings to introduce the concepts and then go into
arrays later.

Robert A Duff wrote:

> "Alex" <alex@foo.invalid> writes:
> 
> > Oh, I see how you're confused. Once you get the value of each digit
> > in the PIN, though, it doesn't matter that the 3-4-5 corresponding
> > to V-A-L  isn't in ASCII order. . . it's still just a direct
> > index-based lookup (just off-by-one because Ada Strings are indexed
> > starting at 1 rather than 0).
> 
> There's no off-by-one issue here.  The OP wants a mapping from
> digit characters to other characters.  That can be implemented
> as a simple array, with the right index subtype.  That array
> isn't a String, because they keys are not integers.
> 
> - Bob