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german/ruby187_192_bug

Created December 8, 2010 10:53
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bug in ruby 1.8.7 / ruby 1.9.2 preview 1 (wrong rounding)
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ruby187_192_bug
$ ruby -v
ruby 1.8.7 (2010-06-23 patchlevel 299) [i686-linux]
$irb
ruby-1.8.7-p299 > a = (125.33 - (125.33/100.0*50.0))
=> 62.665
ruby-1.8.7-p299 > b = 62.665
=> 62.665
ruby-1.8.7-p299 > (a*100).round
=> 6266
ruby-1.8.7-p299 > (b*100).round
=> 6267
$ ruby -v
ruby 1.9.2dev (2009-07-18 trunk 24186) [i686-linux]
$ irb
ruby-1.9.2-preview1 > a = (125.33 - (125.33/100.0*50.0))
=> 62.66499999999999 # which is obviously wrong as well
ruby-1.9.2-preview1 > b = 62.665
=> 62.665
ruby-1.9.2-preview1 > (a*100).round
=> 6266
ruby-1.9.2-preview1 > (b*100).round
=> 6267
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