From: Karl Brodowsky <redmine@...>
Date: 2009-04-22T19:36:08+09:00
Subject: [ruby-core:23284] [Bug #1397] to_f of rational

Bug #1397: to_f of rational
http://redmine.ruby-lang.org/issues/show/1397

Author: Karl Brodowsky
Status: Open, Priority: Normal
Category: core, Target version: Ruby 1.8.8
ruby -v: ruby 1.8.7 (2008-08-11 patchlevel 72) [i686-linux]

irb
irb(main):001:0> require "rational"
=> true
irb(main):002:0> a=10**309
=> 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
irb(main):003:0> b=a+1
=> 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
irb(main):004:0> c=Rational(a,b)
=> Rational(1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000, 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001)
irb(main):005:0> c.to_f
/usr/local/lib/ruby/1.8/rational.rb:390: warning: Bignum out of Float range
/usr/local/lib/ruby/1.8/rational.rb:390: warning: Bignum out of Float range
=> NaN


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