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Bug #8299

open

Minor error in float parsing

Added by bobjalex (Bob Alexander) over 8 years ago. Updated over 1 year ago.

Status:
Assigned
Priority:
Normal
Target version:
-
ruby -v:
trunk
Backport:
[ruby-core:54473]
Tags:

Description

I encountered a float that either parses [slightly] differently (or converts to string differently) in Ruby than it does in Python or Java. This looks like a Ruby bug since the result "looks" incorrect.

It is easily reproduced by entering the magic number (-1.1505945E-5) into irb. It behaves the same in 2.0 and 1.9. I'm using Windows.

Below is an irb session that demonstrates. Also included are JRuby and Python trials that show better behavior.

This issue is not causing me any problems, but just in case someone there is interested in looking into it...

Bob

ruby -v
ruby 2.0.0p0 (2013-02-24) [i386-mingw32]

irb
irb(main):001:0> RUBY_VERSION
=> "2.0.0"
irb(main):002:0> -1.1505945E-5
=> -1.1505945000000001e-05

ruby19 -v
ruby 1.9.3p392 (2013-02-22) [i386-mingw32]

irb19
irb(main):001:0> RUBY_VERSION
=> "1.9.3"
irb(main):002:0> -1.1505945E-5
=> -1.1505945000000001e-05
irb(main):002:0>

jirb
irb(main):001:0> -1.1505945E-5
=> -1.1505945e-05

python
Python 2.7.4rc1 (default, Mar 24 2013, 14:34:32) [MSC v.1500 32 bit (Intel)] on
win32
Type "help", "copyright", "credits" or "license" for more information.

-1.1505945E-5
-1.1505945e-05
repr(-1.1505945E-5)
'-1.1505945e-05'


Related issues

Related to Ruby master - Bug #8358: TestSprintf#test_float test failureClosedluislavena (Luis Lavena)05/02/2013Actions
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