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Re: absolute value of min_integer a negative number?

From: Daniel Diaz
Subject: Re: absolute value of min_integer a negative number?
Date: Sun, 02 Nov 2008 10:40:12 +0100
User-agent: Thunderbird (Windows/20080914)

This is "normal" since gprolog does not test for integer overflow. The same occurs with:

?- current_prolog_flag(max_integer,X),Y is X+1.
X = 268435455
Y = -268435456


Dave Sworin a écrit :
I ran the following in gprolog 1.3.0.  (I typed this in by hand.)
| ?- current_prolog_flag(min_integer,MIN_INTEGER),X is abs(MIN_INTEGER).
MIN_INTEGER = -268435456
X = -268435456
| ?-
Can someone check this on another computer?  I was working under Fedora Core 4,
using the kernel 2.6.11-1.1369_FC4smp on a Pentium 4 processor with
Hyper-Threading Technology.  I was pretty surprised to see the result of an absolute
value that is negative.

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