Re: [Haskell-cafe] 9.3 - (2 * 4.5) => 0.3000000000000007

This may be of interest if you want full-precision decimals: http://www.haskell.org/haskellwiki/Libraries_and_tools/Mathematics#Decimal_n... On Wed, Jan 16, 2013 at 7:30 AM, Patrick Mylund Nielsen < haskell@patrickmylund.com> wrote:

Fun with floating point!

# ghci GHCi, version 7.4.2: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Prelude> 9223372036854775807.0 == 9223372036854775808 True

http://en.wikipedia.org/wiki/Floating_point#Accuracy_problems

On Wed, Jan 16, 2013 at 7:25 AM, ivan dragolov wrote:

...

9.3 - (2 * 4.5) => 0.3000000000000007

I expected 0.3

?

-- Иван Драголов dragolov.net

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