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Bug #7024

90 * 1.1 => 99.00000000000001

Added by Julien Grillot about 4 years ago. Updated about 4 years ago.

Status:
Rejected
Priority:
Normal
Assignee:
-
ruby -v:
ruby 1.9.3p194 (2012-04-20 revision 35410) [i686-linux]
[ruby-core:47535]

Description

$ ruby -v
ruby 1.9.3p194 (2012-04-20 revision 35410) [i686-linux]
$ irb
1.9.3p194 :001 > 90*1.1
=> 99.00000000000001
1.9.3p194 :002 > 90.0*1.1
=> 99.00000000000001

Expected value: 99.0

Thanks for your job every one!

History

#1 [ruby-core:47536] Updated by Marc-Andre Lafortune about 4 years ago

  • Status changed from Open to Rejected

This is expected from floating point calculations; you'll get this result in other languages too.

Checkout http://0.30000000000000004.com/

#2 [ruby-core:47542] Updated by Alexey Muranov about 4 years ago

Julien, try

(90 * Rational(11, 10)).to_f

or

(90 * '1.1'.to_r).to_f

or

(90 * 1.1.rationalize).to_f

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