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Bug #10592

closed

Adding floats resluts in an incorrect result

Added by doma (Domokos Molnar) over 9 years ago. Updated over 9 years ago.

Status:
Rejected
Assignee:
-
Target version:
-
ruby -v:
ruby 2.1.5p273 (2014-11-13 revision 48405) [x86_64-linux]
Backport:
2.0.0: UNKNOWN, 2.1: UNKNOWN
[ruby-core:66799]

Description

1.1+1.1+1.1 = 3.3

However in the current 2.1.5 this is what happens:

dmolnar@domalaptop:~> irb
2.1.5 :001 > 1.1+1.1+1.1
 => 3.3000000000000003 
2.1.5 :002 >

Files

test_float.rb (17 Bytes) test_float.rb doma (Domokos Molnar), 12/12/2014 08:50 AM
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 #1 [ruby-core:66800]

Updated by doma (Domokos Molnar) over 9 years ago 

dmolnar@domalaptop:~> irb
2.1.5 :001 > 1.1+1.1+1.1-3.3
 => 4.440892098500626e-16
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 #3 [ruby-core:66802]

Updated by recursive-madman (Recursive Madman) over 9 years ago

Use Rational if you want exact results:

1.1 * 3 #=> 3.3000000000000003

(Rational('1.1') * 3).to_f #=> 3.3
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 #4 [ruby-core:66804]

Updated by nobu (Nobuyoshi Nakada) over 9 years ago

  • Description updated (diff)
  • Status changed from Open to Rejected
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 #5 [ruby-core:66809]

Updated by doma (Domokos Molnar) over 9 years ago

So true. Sorry about reporting it.

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