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[Ruby]単純な計算結果がおかしい

Ruby

Last updated at 2016-01-14Posted at 2016-01-14

どうでもいい話ですが、Ubuntu で ruby 1.9.3p484 使ってて単純な計算結果が変であることに気づく。何で？丸め誤差？

xxxxx@titan:~$ uname -a
Linux titan 3.13.0-74-generic #118-Ubuntu SMP Thu Dec 17 22:52:02 UTC 2015 i686 i686 i686 GNU/Linux
xxxxx@titan:~$ ruby -v
ruby 1.9.3p484 (2013-11-22 revision 43786) [i686-linux]
xxxxx@titan:~$ ruby -e 'puts 1.1*2.2'
2.4200000000000004
xxxxx@titan:~$ ruby -e 'puts 1.1*2.2*3.3'
7.986000000000001
xxxxx@titan:~$

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