From: Marc-Andre Lafortune <ruby-core@...>
Date: 2011-09-13T07:38:02+09:00
Subject: [ruby-core:39490] [Ruby 1.9 - Bug #5309] 0.6.to_r != "0.6".to_r


Issue #5309 has been updated by Marc-Andre Lafortune.


Use `Float#rationalize` instead of `to_r`, and you will get the same result as `String#to_r`. I've argued before that `Float#to_r` should be `Float#rationalize`, though.
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Bug #5309: 0.6.to_r != "0.6".to_r
http://redmine.ruby-lang.org/issues/5309

Author: Brian Ford
Status: Rejected
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: ruby 1.9.2p290 (2011-07-09 revision 32553) [x86_64-darwin10.8.0]


0.6.to_r != "0.6".to_r

Is this a bug?

$ ruby -v
ruby 1.9.2p290 (2011-07-09 revision 32553) [x86_64-darwin10.8.0]

$ irb
ruby-1.9.2-p290 :001 > 0.6.to_r
 => (5404319552844595/9007199254740992) 
ruby-1.9.2-p290 :002 > "0.6".to_r
 => (3/5) 
ruby-1.9.2-p290 :003 > a = "%.55f" % 0.6
 => "0.5999999999999999777955395074968691915273666381835937500" 
ruby-1.9.2-p290 :004 > b = "%.55f" % "0.6".to_f
 => "0.5999999999999999777955395074968691915273666381835937500" 
ruby-1.9.2-p290 :005 > a == b
 => true 

Thanks,
Brian


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