Slightly tongue in cheek, I think the real problem is that your courses come in the wrong order. No one should use floating point numbers without first having a course in numerical analysis. :) -- Lennart On Aug 30, 2006, at 14:38 , Jamie Brandon wrote:
I recently defied my supervisor and used Haskell to write my coursework instead of C. All went well until I needed floating point and started having odd results. As far as I can tell it isn't substantially affecting my results but it is rather embarrassing after slagging off C so much. Here are some examples:
*Main> 0.2 + 0.1 0.30000000000000004 *Main> 0.200000000000000 + 0.100000000000000000 0.30000000000000004 *Main> 0.3 + 0.1 0.4 *Main> 0.2 + 0.1 0.30000000000000004 *Main> it + 0.1 0.4
I assume this is a result of the discrepancy between binary and decimal representations of the numbers. Is there any way around? For a start, it would be nice to have a simple way to get 0.1 + 0.2 == 0.3 = True
This is with GHC 6.4.1 and GCC 4.0.3
Thanks, Jamie
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