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itspriddle/gist:4698767

Created February 2, 2013 18:48
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This is why you shouldn't use floating points for money in your app
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gistfile1.txt
~ > node -e "console.log((0.1 + 0.2) + 0.3 == 0.1 + (0.2 + 0.3))"
false
~ > php -r "var_dump((0.1 + 0.2) + 0.3 == 0.1 + (0.2 + 0.3));"
bool(false)
~ > ruby -e "p (0.1 + 0.2) + 0.3 == 0.1 + (0.2 + 0.3)"
false
~ > python -c "print (0.1 + 0.2) + 0.3 == 0.1 + (0.2 + 0.3)"
False
~ > perl -e "print ((0.1 + 0.2) + 0.3 == 0.1 + (0.2 + 0.3) ? 'true' : 'false')"
false
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Found this via:

  1. http://asserttrue.blogspot.com/2013/02/are-you-javascript-guru-try-this-test.html
  2. http://www.macaulay.ac.uk/fearlus/floating-point/

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