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From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Newsgroups: comp.lang.ada
Subject: Re: Help needed - Upper Bound of an array - Question.
Date: Tue, 07 Feb 2012 19:22:52 +0100
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Date: 2012-02-07T19:22:52+01:00
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adacrypt writes on comp.lang.ada:
> Many thanks to everyone - your'e a bit over my head technically but I
> get the gist of it from each one of you.
>
> This is my declaration.
>
>  SUBTYPE Index_30 IS Integer RANGE -500000 .. 500000;
>   TYPE I_CoefficientsNumArray IS ARRAY(Index_30) OF Integer;
>   I_Num : I_CoefficientsNumArray;
>   -- counts the occurences of the j coefficients of the ciphertext.
>
> Question : can I use your 'big array' declaration procedure in Ada-95
> just as you have typed here ? that would be great - will it work just
> by replacing the present declaration with this? do I type in as a
> straight crib just like that, regards - adacrypt

Yes, you would simply augment your program with an access type
declaration like so:

SUBTYPE Index_30 IS Integer RANGE -500000 .. 500000;
TYPE I_CoefficientsNumArray IS ARRAY(Index_30) OF Integer;

type Array_Access is access I_CoefficientsNumArray; -- new type

I_Num : Array_Access := new I_CoefficientsNumArray; -- allocate on the heap
-- counts the occurences of the j coefficients of the ciphertext.

For more details on dynamic memory allocation and deallocation and
access types, read this:

http://www.it.bton.ac.uk/staff/je/adacraft/ch11.htm

which is the book I recommend for novice programmers.  In fact, even I
enjoyed this book thoroughly when I learned Ada as my 12th (or so)
programming language :)

-- 
Ludovic Brenta.