[erlang-bugs] Math library defect?

John Haugeland <>
Thu May 15 16:18:50 CEST 2008


I believe I have found a defect in the math library.

24> io:format("~f",[math:pow(2,56)]).
72057594037927936.000000ok

25> io:format("~f",[math:pow(2,57)]).
144115188075855870.000000ok

26> 72057594037927936 * 2.
144115188075855872

You'll notice that the value given by step 25 is incorrect by two.
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