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From: "zork" <zork@nospam.com>
Newsgroups: comp.lang.ada
References: <wDvLc.542$pr3.465@roc.nntpserver.com>
 <87zn5tl7n1.fsf@insalien.org>
Subject: Re: unconstrained array type problems
Date: Thu, 22 Jul 2004 01:33:34 +1000
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Date: 2004-07-22T01:33:34+10:00
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Hi thanks for that!

Yes that works for one array (just tried it) thanks!. What i forgot to
mention was that i need to read in a number of arrays from the text file,
and perform various operations between the arrays (multiplication). If i
define a 'declare' then each matrix will only be visible to itself ( i.e.
wont be visible to one another), hence the following wont work?

begin
   Get (File, number_rows);
   Get (File, number_columns);
   declare
      array1: Matrix_Type (1 .. number_rows, 1 .. number_columns);
   begin
      -- read in array1
   end;

   Get (File, number_rows);
   Get (File, number_columns);
   declare
      array2: Matrix_Type (1 .. number_rows, 1 .. number_columns);
   begin
      -- read in array2
   end;

  -- multiply array1 by array2 (array multiplication)

end;

How can i make them visible to one another? This is so easy to do in
c++/java. ADD so tight.

Thanks again!
zork

"Ludovic Brenta" <ludovic.brenta@insalien.org> wrote in message
news:87zn5tl7n1.fsf@insalien.org...
> "zork" writes:
> > procedure Matrix is
> >
> >     type Matrix_Type is array ( Integer range <>, Integer range <> ) of
> > Float;
> >     ..
> >     ..
> > begin
> >     ..
> >     Get ( File, number_rows ); -- read the number of rows from file
> >     Get ( File, number_columns ); -- read the number of columns from
file
> >     array1 : Matrix_Type ( 1 .. number_rows, 1 .. number_columns );
> >     ..
> > end Matrix;
> > ------------------
> >
> > I cant seem to define my array1 in the begin / end block. This is a bit
> > frustrating. How does one get around this? Is an unconstrained array the
> > best choice?
> >
> > Any help most appreciated!
>
> You can do it with a declare block:
>
> begin
>    Get (File, number_rows);
>    Get (File, number_columns);
>    declare
>       array1: Matrix_Type (1 .. number_rows, 1 .. number_columns);
>    begin
>       -- process array1
>    end;
> end;
>
> But if your processing is long, consider changing the declare block to
> a subprogram, and passing number_columns and number_rows to it.
>
> -- 
> Ludovic Brenta.