From: ara.t.howard@...
Date: 2006-02-16T02:03:24+09:00
Subject: Re: pack("l"), 64 bit question

On Thu, 16 Feb 2006, Daniel Berger wrote:

> Hi all,
>
> Ruby 1.8.4
> Solaris 10
>
> Is this correct?
>
> # 32 bit
> irb(main):002:0> [-1].pack("l")
> => "\377\377\377\377"
> irb(main):003:0> "\377\377\377\377".unpack("l")
> => [-1]
>
> # 64 bit
> irb(main):002:0> [-1].pack("l")
> => "\377\377\377\377"
> irb(main):003:0> "\377\377\377\377".unpack("l")
> => [4294967295]
>
> Regards,
>
> Dan

btw.  this is useful for me

   irb(main):008:0> to_bin = lambda{|s| '[ ' << s.unpack('c*').map{|b| '%8.8b' % b}.join(' ') << ' ]'}
   => #<Proc:0xb7569f90@(irb):8>

   irb(main):009:0> to_bin[ [-1].pack("l") ]
   => "[ 11111111 11111111 11111111 11111111 ]"

   irb(main):010:0> to_bin[ [-1].pack("i") ]
   => "[ 11111111 11111111 11111111 11111111 ]"

   irb(main):011:0> to_bin[ [1].pack("l") ]
   => "[ 00000001 00000000 00000000 00000000 ]"

   irb(main):012:0> to_bin[ [1].pack("i") ]
   => "[ 00000001 00000000 00000000 00000000 ]"


-a

-- 
judge your success by what you had to give up in order to get it.
- h.h. the 14th dali lama
cat a.rb