Hello Monks,

I get different results for formatted printing of big numbers between Slackware 13.37 x86_64 (real PC):
  - perl 5, version 12, subversion 3 (v5.12.3) built for x86_64-linux-thread-multi
and all three of:
Slackware 13.37 32bit (running as a VMWare Player guest)
  - perl 5, version 12, subversion 3 (v5.12.3) built for i486-linux-thread-multi
Windows XP Home Edition Service Pack 3 (build 2600) 32bit (running as a VMWare Player guest)
  - (ActivePerl) perl 5, version 12, subversion 4 (v5.12.4) built for MSWin32-x86-multi-thread
  - (Strawberry Perl) perl 5, version 12, subversion 3 (v5.12.3) built for MSWin32-x86-multi-thread

I suppose it's related to "use bignum;" and 32bit.

The results on the 32bit OSs print correctly for big numbers when using a simple "print" statement. But when I try formatted printing using printf, or using print on a string produced by sprintf, then the values are wrong for big numbers (> 2**32 - 1). The problem occurs with all non-floating point formats I tried: binary (%b), octal (%o), hex (%h) and int (%u).
I also printed out in scientific (%e) and floating point (%f) - they are correct.

Code and results are below. Anybody any ideas?

Cheers, Peter 

#!/usr/bin/perl
use warnings;
use strict;
use bignum;

my $i = 10;
&format_and_print;

$i = 4300000000;
&format_and_print;

sub format_and_print {
print "i: $i\n";

my $ibytes = sprintf("%b", $i);
print  "print ibytes : $ibytes\n";
printf("printf ibytes: %s\n", $ibytes);

my $ioctal = sprintf("%o", $i);
print  "print ioctal : $ioctal\n";
printf("printf ioctal: %s\n", $ioctal);

my $ihex = sprintf("%x", $i);
print  "print ihex   : $ihex\n";
printf("printf ihex  : %s\n", $ihex);

my $isci = sprintf("%e", $i);
print  "print isci   : $isci\n";
printf("printf isci  : %s\n", $isci);

my $ifloat = sprintf("%f", $i);
print  "print ifloat : $ifloat\n";
printf("printf ifloat: %s\n", $ifloat);

my $iint = sprintf("%u", $i);
print  "print iint   : $iint\n";
printf("printf iint  : %s\n\n", $iint);
}

exit;

[download]
All 3 of Win XP 32bit ActivePerl, Win XP 32bit Strawberry Perl and Slackware 13.37 32 bit give identical incorrect results (for big numbers > 2**32 - 1): 
i: 10
print ibytes : 1010
printf ibytes: 1010
print ioctal : 12
printf ioctal: 12
print ihex   : a
printf ihex  : a
print isci   : 1.000000e+01
printf isci  : 1.000000e+01
print ifloat : 10.000000
printf ifloat: 10.000000
print iint   : 10
printf iint  : 10

i: 4300000000
print ibytes : 11111111111111111111111111111111
printf ibytes: 11111111111111111111111111111111
print ioctal : 37777777777
printf ioctal: 37777777777
print ihex   : ffffffff
printf ihex  : ffffffff
print isci   : 4.300000e+09
printf isci  : 4.300000e+09
print ifloat : 4300000000.000000
printf ifloat: 4300000000.000000
print iint   : 4294967295
printf iint  : 4294967295

[download]
Slackware 13.37 x86_64 correct results: 
i: 10
print ibytes : 1010
printf ibytes: 1010
print ioctal : 12
printf ioctal: 12
print ihex   : a
printf ihex  : a
print isci   : 1.000000e+01
printf isci  : 1.000000e+01
print ifloat : 10.000000
printf ifloat: 10.000000
print iint   : 10
printf iint  : 10

i: 4300000000
print ibytes : 100000000010011001100101100000000
printf ibytes: 100000000010011001100101100000000
print ioctal : 40023145400
printf ioctal: 40023145400
print ihex   : 1004ccb00
printf ihex  : 1004ccb00
print isci   : 4.300000e+09
printf isci  : 4.300000e+09
print ifloat : 4300000000.000000
printf ifloat: 4300000000.000000
print iint   : 4300000000
printf iint  : 4300000000

[download]

In reply to bignum with (s)printf - 64bit OS OK, 32bit incorrect. What to do? by geep999

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