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From: johnherro@aol.com (John Herro)
Subject: Re: In Exception ?
Date: 1998/04/07
Message-ID: <1998040713020801.JAA18110@ladder01.news.aol.com>#1/1
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Newsgroups: comp.lang.ada
Date: 1998-04-07T00:00:00+00:00
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pvanbell@mhv.net wrote:
> Or else use an enumeration variable that is
> set to either EXCEPTION or NORMAL: ...
> Type Calling_Source_Type is (Exception, Normal);

I bet it won't compile!  For the same reason that none of these will compile:

type Direction is (Forward, Reverse, Left, Right);
type Tape_Command is (Play, Record, Stop, Fast_Forward, Rewind, Pause);
type Chemical Element is (H, He, Li, Be, ...); -- Fails at Indium.
type State is (AL, AK, AZ, AR, ...); -- Fails at Indiana and Oregon.

Those darn reserved words bite you when you least expect it!  On the other
hand, I once saw a Fortran program that used IF for a variable name!  (Fortran
has keywords but no reserved words.)  To make readability even worse, although
the variable name implies integer, the variable was actually floating point! 
(It was the Intermediate Frequency in a radio.)  I guess Ada's reserved words
aren't so bad after all!

In any event, the advice given is fine; just make a slight change to the
spelling of "Exception."

- John Herro
Download the shareware AdaTutor program at
http://members.aol.com/AdaTutor