Bug #7024: 90 * 1.1 => 99.00000000000001

• Status: Rejected
• Assignee: -
• Target version: 1.9.3
• ruby -v: ruby 1.9.3p194 (2012-04-20 revision 35410) [i686-linux]

[Bahanix (Julien -)]

$ ruby -v
ruby 1.9.3p194 (2012-04-20 revision 35410) [i686-linux]
$ irb
1.9.3p194 :001 > 901.1
=> 99.00000000000001
1.9.3p194 :002 > 90.01.1
=> 99.00000000000001

Expected value: 99.0

Thanks for your job every one!

[marcandre (Marc-Andre Lafortune)]

• 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/

[alexeymuranov (Alexey Muranov)]

Julien, try

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

or

(90 * '1.1'.to_r).to_f

or

(90 * 1.1.rationalize).to_f