Re: Cygwin Perl and Module Math::BigInt

["Gerrit P. Haase" <freeweb@nyckelpiga.de>]

Hallo Tels,

2001-11-14 21:12:13, du schriebst:

>>  I tried to 'make test' on the the Convert:ASN1 and it kept fail at
>>  place where the Math::BigInt always returns NaN.
>>
>>  I cut out the segment below and ran it and sure enough, it return
>>  NaN in Cygwin Perl.  However, the same script return a number in
>>  ActiveState Perl:
>>
>>#--------------------------
>>use strict;
>>use Math::BigInt;
>>
>>my $num = Math::BigInt->new(-1 * (1<<24) * (1<<24));
>>
>>print "$num\n";
>>
>>exit;
>>
>>#----- Cygwin perl returns:  NaN
>>
>>#----- ActiveState perl returns :  -281474976710656
>>
>> Any idea how to fix this in Cygwin?  Thank in advance!

> The scalar probably overflowed and returned "NaN" so that BigInt also
> produced a "NaN".

> On my Linux 32 bit box it produces the same number than Activestate.

> What version of Bigint do you have? And what does Perl print without the
> bigInt->new() around the expression?

Without Math::BigInt->new() (I added several print statements):

$ perl t/06bigint.t
1..35
[...]
$num is now: -2.8147497671066e+14
#32: expecting hex:0207ff000000000000
#32:       got hex:0207fefffffffffffc
#line 93 t/06bigint.t
not ok 32
ok 33
ok 34
#35: expecting -2.8147497671066e+14
#35:       got -281474976710656
#line 96 t/06bigint.t
not ok 35

If I change it back:

$num is now: -281474976710660
#32: expecting hex:0207ff000000000000
#32:       got hex:0207fefffffffffffc
#line 90 t/06bigint.t
not ok 32
ok 33
ok 34
#35: expecting -281474976710660
#35:       got -281474976710656
#line 93 t/06bigint.t
not ok 35

>>#----- Cygwin perl returns:  NaN
>>
>>#----- ActiveState perl returns :  -281474976710656

That is not correct, cygwin perl returns the same as Activestate:
#35:       got -281474976710656

with or without Math::BigInt->new().

>  perl -MDev::Bollocks -e'print Dev::Bollocks->rand(),"\n"'

cnt: 5 for 1 sum: 1
cnt: 5 for 2 sum: 1
cnt: 5 for 3 sum: 2509
cnt: 5 for 4 sum: 205657
return 4
autoschediastically scale B2C CEOs

;)

Gerrit
-- 
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                                                  Vitalisstraße 326-328
Gerrit P. Haase                                   D-50933 Köln
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