From: "Anders Wirzenius" <anders.wirzenius@pp.qnet.fi>
Subject: Re: In case statment? (was Re: is exception when others => null; smart?)
Date: Wed, 30 Oct 2002 08:58:10 GMT
Date: 2002-10-30T08:58:10+00:00 [thread overview]
Message-ID: <CaNv9.103$eX2.5358@read2.inet.fi> (raw)
In-Reply-To: 1b585154.0210291023.70af4929@posting.google.com
"Peter Richtmyer" <prichtmyer@yahoo.com> wrote in message
news:1b585154.0210291023.70af4929@posting.google.com...
> As the following example illustrates, it really depends upon
> the compiler too. A "bad" value is handled differently as
> shown:
> -----------------------------------------------------------
> with system;
> with text_io;
> procedure test is
>
> a : character := character'val(2#11111111#);
> for a'size use 8;
> b : boolean;
> for b'address use a'address;
> for b'size use 8;
>
> begin
>
> case b is
> when true =>
> text_io.put_line ("b is true");
> when false =>
> text_io.put_line ("b is false");
> when others =>
> text_io.put_line ("ObjectAda for Windows V7.1.105 " &
> "professional " edition gets here, " &
> "and so does Rational Apex Ada 95 v. 4.0.0b");
> end case;
>
> exception
> when others =>
> text_io.put_line ("Gnat 3.14P gets here ");
> end test;
> ---------------------------------------------------------------
But if you move the assignment to after begin, the Gnat behaviour changes:
...
a : character;
for a'size use 8;
b : boolean := false;
for b'address use a'address;
for b'size use 8;
begin
a := character'val(2#11111111#);
...
and the program execution ends up under when others =>
Anders
next prev parent reply other threads:[~2002-10-30 8:58 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-24 14:03 is exception when others => null; smart? Preben Randhol
2002-10-24 14:25 ` David C. Hoos, Sr.
2002-10-24 14:28 ` Preben Randhol
2002-10-24 14:38 ` Per Sandbergs
2002-10-25 15:04 ` Robert A Duff
2002-10-25 20:41 ` Dale Stanbrough
2002-10-26 23:04 ` Robert A Duff
2002-10-26 7:47 ` tmoran
2002-10-24 16:39 ` Mark Biggar
2002-10-24 20:06 ` Robert A Duff
2002-10-24 20:23 ` Wes Groleau
2002-10-25 1:16 ` Jeffrey Carter
2002-10-25 10:10 ` In case statment? (was Re: is exception when others => null; smart?) Preben Randhol
2002-10-25 14:59 ` Robert A Duff
2002-10-25 15:06 ` Preben Randhol
2002-10-29 18:23 ` Peter Richtmyer
2002-10-30 2:52 ` Steven Deller
2002-10-30 8:58 ` Anders Wirzenius [this message]
2002-10-30 19:57 ` Peter Richtmyer
2002-10-31 7:02 ` Anders Wirzenius
2002-10-30 9:36 ` Lutz Donnerhacke
2002-10-30 19:44 ` Peter Richtmyer
2002-10-30 13:28 ` Marin David Condic
2002-10-30 20:34 ` Robert Spooner
2002-10-31 12:40 ` In case statment? (was Re: is exception when others => null;smart?) Marin David Condic
2002-10-25 17:13 ` In case statment? <...> when others John Woodruff
2002-10-27 21:03 ` In case statment? (was Re: is exception when others => null; smart?) Ze Administrator
2002-10-28 10:04 ` Preben Randhol
2002-10-28 20:05 ` Wes Groleau
2002-10-30 11:31 ` Preben Randhol
2002-10-28 12:32 ` In case statment? (was Re: is exception when others => null;smart?) Adrian Hoe
2002-10-24 20:11 ` is exception when others => null; smart? Simon Wright
2002-10-24 21:22 ` Larry Kilgallen
2002-10-24 20:03 ` Robert A Duff
2002-10-25 1:49 ` SteveD
2002-10-25 3:48 ` Dennis Lee Bieber
2002-10-26 11:34 ` Preben Randhol
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