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From: Adam Beneschan <adam@irvine.com>
Newsgroups: comp.lang.ada
Subject: Re: Ada Recursion with strings
Date: Tue, 30 Sep 2008 17:28:46 -0700 (PDT)
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Date: 2008-09-30T17:28:46-07:00
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On Sep 30, 5:13 pm, Joe <joesmo...@gmail.com> wrote:
> On Sep 30, 6:24 pm, "Jeffrey R. Carter"
>
> <spam.jrcarter....@spam.acm.org> wrote:
> > Though you can refer to the function IP_String within itself as
> > Ip_Packet.IP_String, it would be better to change the name of the parameter to
> > something other than the name of the function, like Current_Result.
>
> doh, I didn't even see that.  Changing the parameter name solved all
> my problems.
>
> > How many times does the magic number 2 ** 8 appear in this short example?
>
> Thrice, I'm not sure I know what you're getting at.
>
> > There are other errors in your code; you'll probably figure several of
> > them out once you get your program to run, and you'll probably figure
> > another out if you change 123456 in your test to 65536.
>
> Thank you Adam for that little hint.  The 2**8n numbers now work as
> expected.
>
> One other thing.  The image attribute returns a string with a space in
> front.  Is there any way to get rid of the space?

The function

Ada.Strings.Fixed.Trim (S, Ada.Strings.Both)

will get rid of all leading and trailing spaces from S.

I'd much prefer to have an 'Image attribute that didn't add that blank
(it only adds it for nonnegative numbers).  I'm not sure why the
decision was made (back in Ada 83) to add the blank; having a
formatted number with either a blank or a minus sign in front can help
get numbers lined up in a report, but 'Image returns a variable-length
string anyway so I don't think it could be used effectively to line
anything up.  This is one of the most annoying features of Ada, and
I'm betting that I'm not alone in thinking that.

                                -- Adam