From: Simon Pilgrim <simon.pilgrim@gecm.com>
Subject: Re: Renaming Fixed Point Mutiplicative operator in Ada 95
Date: 1998/05/21
Date: 1998-05-21T00:00:00+00:00 [thread overview]
Message-ID: <3564A1ED.3DAC@gecm.com> (raw)
In-Reply-To: dewar.895785693@merv
Robert Dewar wrote:
<< Incidentally, in a critical system, I would jolly well hope that
EITHER
a) you prove that division by zero cannot happen
or
b) you test for it explicitly
if z = 0 then
....
else
a := y /z;
end if; >>
It is not sufficient to just check for equality to zero with fixed point
types. If z is small enough then a divide by zero exception will still
be generated by some targets (Intel 486 & Motorola 68k for example).
Regards,
Simon Pilgrim
next prev parent reply other threads:[~1998-05-21 0:00 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-05-19 0:00 Renaming Fixed Point Mutiplicative operator in Ada 95 Stuart Hutchesson
1998-05-19 0:00 ` Matthew Heaney
1998-05-20 0:00 ` Robert Dewar
[not found] ` <matthew_heaney-ya023680002005981908570001@news.ni.net>
1998-05-21 0:00 ` Robert Dewar
1998-05-22 0:00 ` Robert I. Eachus
1998-05-23 0:00 ` Robert Dewar
[not found] ` <01bd84c3$47215d60$440029a1@m00rq900>
1998-05-21 0:00 ` Robert Dewar
1998-05-21 0:00 ` Simon Pilgrim [this message]
1998-05-21 0:00 ` Matthew Heaney
1998-05-22 0:00 ` Robert I. Eachus
1998-05-22 0:00 ` Stuart Hutchesson
1998-05-22 0:00 ` Matthew Heaney
1998-05-23 0:00 ` Robert Dewar
1998-05-22 0:00 ` Rod Chapman
1998-05-22 0:00 ` John McCabe
1998-05-21 0:00 ` Matthew Heaney
1998-05-21 0:00 ` Robert Dewar
1998-05-21 0:00 ` John McCabe
1998-05-21 0:00 ` Matthew Heaney
1998-05-21 0:00 ` Robert Dewar
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