Hello,
Can anyone explain why this is happening?
---- on x86_64 ----
$ ruby -v
ruby 1.8.4 (2005-12-24) [x86_64-linux]
$ irb
2956350890592680056.to_s(2)
RangeError: integer 2956350890592680056 too big to convert to `int'
from (irb):1:in `to_s'
from (irb):1
---- on x86 ----
$ ruby -v
ruby 1.8.4 (2005-12-24) [i486-linux]
$ irb
2956350890592680056.to_s(2)
=> "10100100000111000100010111100010111001001011111011100001111000"
Thanks for your consideration.
Suraj Kurapati wrote:
Hello,
Can anyone explain why this is happening?
---- on x86_64 ----
$ ruby -v
ruby 1.8.4 (2005-12-24) [x86_64-linux]$ irb
2956350890592680056.to_s(2)
RangeError: integer 2956350890592680056 too big to convert to `int'
from (irb):1:in `to_s'
from (irb):1
from :0---- on x86 ----
$ ruby -v
ruby 1.8.4 (2005-12-24) [i486-linux]$ irb
2956350890592680056.to_s(2)
=> "10100100000111000100010111100010111001001011111011100001111000"
Thanks for your consideration.
It's way too large to fit into an old-style integer of 32 bits, but it fits
with two bits to spare in a 64-bit integer. Also, in Ruby, normally an
integer too large for the Fixnum class is automatically converted to a
Bignum, so this error should not have happened.
Try this test:
32.upto(128) do |p|
puts 2 ** p
end
See what happens on both platforms. BTW I am thinking this is an error in
the x86_64 Ruby code.
--
Paul Lutus
http://www.arachnoid.com
Suraj Kurapati schrieb:
Hello,
Can anyone explain why this is happening?
no, but it works here:
patrick@Dragon:~$ irb
irb(main):001:0> 2956350890592680056.to_s(2)
=> "10100100000111000100010111100010111001001011111011100001111000"
irb(main):002:0> quit
patrick@Dragon:~$ ruby -v
ruby 1.8.5 (2006-08-25) [x86_64-linux]
maybe it helps to track the problem.
thanks,
patrick
Suraj Kurapati:
$ ruby -v
ruby 1.8.4 (2005-12-24) [x86_64-linux]$ irb
2956350890592680056.to_s(2)
RangeError: integer 2956350890592680056 too big to convert to `int'
"#{RUBY_VERSION} #{RUBY_PLATFORM} #{RUBY_RELEASE_DATE}"
=> "1.9.0 x86_64-linux 2006-10-16"
2956350890592680056.to_s(2)
=> "10100100000111000100010111100010111001001011111011100001111000"
"#{RUBY_VERSION} #{RUBY_PLATFORM} #{RUBY_RELEASE_DATE}"
=> "1.8.4 x86_64-linux 2005-12-24"
2956350890592680056.to_s(2)
RangeError: integer 2956350890592680056 too big to convert to `int'
from (irb):2:in `to_s'
from (irb):2
Kalman
Paul Lutus wrote:
It's way too large to fit into an old-style integer of 32 bits, but it fits
with two bits to spare in a 64-bit integer. Also, in Ruby, normally an
integer too large for the Fixnum class is automatically converted to a
Bignum, so this error should not have happened.Try this test:
32.upto(128) do |p|
puts 2 ** p
endSee what happens on both platforms. BTW I am thinking this is an error in
the x86_64 Ruby code.
The same Exception is thrown on my machine.
From cpuinfo:
processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 47
model name : AMD Athlon(tm) 64 Processor 3000+
stepping : 2
Operating System is Ubuntu 6.06 LTS.
Ruby version (installed via OS package manager): ruby 1.8.4 (2005-12-24)
[x86_64-linux].
16.upto(128) do |p|
n = 2 ** p
puts("#{p}: #{n}: #{n.class}")
end
shows a conversion at
61: 2305843009213693952: Fixnum
62: 4611686018427387904: Bignum
where to_s(2) fails at p == 31
16.upto(128) do |p|
n = 2 ** p
puts("#{p}: #{n}: #{n.class}")
puts(n.to_s(2))
end
31: 2147483648: Fixnum
RangeError: integer 2147483648 too big to convert to `int'
Stefan
Kalman Noel wrote:
Suraj Kurapati:
$ ruby -v
ruby 1.8.4 (2005-12-24) [x86_64-linux]$ irb
2956350890592680056.to_s(2)
RangeError: integer 2956350890592680056 too big to convert to `int'
> "#{RUBY_VERSION} #{RUBY_PLATFORM} #{RUBY_RELEASE_DATE}"
=> "1.9.0 x86_64-linux 2006-10-16"
> 2956350890592680056.to_s(2)
=> "10100100000111000100010111100010111001001011111011100001111000"> "#{RUBY_VERSION} #{RUBY_PLATFORM} #{RUBY_RELEASE_DATE}"
=> "1.8.4 x86_64-linux 2005-12-24"
> 2956350890592680056.to_s(2)
RangeError: integer 2956350890592680056 too big to convert to `int'
from (irb):2:in `to_s'
from (irb):2Kalman
Seems on 1.8.5 is ok aswell, so the problem is < 1.8.4
irb(main):001:0> "#{RUBY_VERSION} #{RUBY_PLATFORM} #{RUBY_RELEASE_DATE}"
=> "1.8.5 x86_64-linux 2006-12-04"
irb(main):002:0> 2956350890592680056.to_s(2)
=> "10100100000111000100010111100010111001001011111011100001111000"
--
Andi
Kalman Noel wrote:
Suraj Kurapati:
$ ruby -v
ruby 1.8.4 (2005-12-24) [x86_64-linux]$ irb
2956350890592680056.to_s(2)
RangeError: integer 2956350890592680056 too big to convert to `int'
> "#{RUBY_VERSION} #{RUBY_PLATFORM} #{RUBY_RELEASE_DATE}"
=> "1.9.0 x86_64-linux 2006-10-16"
> 2956350890592680056.to_s(2)
=> "10100100000111000100010111100010111001001011111011100001111000"> "#{RUBY_VERSION} #{RUBY_PLATFORM} #{RUBY_RELEASE_DATE}"
=> "1.8.4 x86_64-linux 2005-12-24"
> 2956350890592680056.to_s(2)
RangeError: integer 2956350890592680056 too big to convert to `int'
from (irb):2:in `to_s'
from (irb):2Kalman
Seems on 1.8.5 is ok aswell, so the problem is < 1.8.4
irb(main):001:0> "#{RUBY_VERSION} #{RUBY_PLATFORM} #{RUBY_RELEASE_DATE}"
=> "1.8.5 x86_64-linux 2006-12-04"
irb(main):002:0> 2956350890592680056.to_s(2)
=> "10100100000111000100010111100010111001001011111011100001111000"
Yep. Here are the relevant changelog entries.
On Tue, 05 Dec 2006 23:24:57 +0900, Mihai Vlad wrote:
Fri Aug 25 17:15:17 2006 Yukihiro Matsumoto <matz@ruby-lang.org>
* stable version 1.8.5 released.
Sun Feb 5 21:05:34 2006 Hirokazu Yamamoto <ocean@m2.ccsnet.ne.jp>
* numeric.c (fix_to_s): removed workaround for radix 2. Historically,
rb_fix2str could only handle radix 8, 10, 16. (Rev1.37) But for now,
it can handle radix 2..36. [ruby-Bugs#3438] [ruby-core:7300]
Sat Feb 4 15:56:37 2006 Hirokazu Yamamoto <ocean@m2.ccsnet.ne.jp>
* numeric.c (fix_to_s): (2**32).to_s(2) fails with exception where
sizeof(int) == 4 < sizeof(long). [ruby-core:7300]
Sat Dec 24 18:58:14 2005 Yukihiro Matsumoto <matz@ruby-lang.org>
* stable version 1.8.4 released.
--
Ken Bloom. PhD candidate. Linguistic Cognition Laboratory.
Department of Computer Science. Illinois Institute of Technology.
http://www.iit.edu/~kbloom1/