Unexpected behaviour of math.floor, round and int functions (rounding)
Peter J. Holzer
hjp-python at hjp.at
Sun Nov 21 13:59:20 EST 2021
On 2021-11-21 10:57:55 +1100, Chris Angelico wrote:
> And if decimal floating point were common, other "surprise" behaviour
> would be cited, like how x < y and (x+y)/2 < x.
Yup. Took me a bit to find an example, but this can happen. My HP-48
calculator uses a mantissa of 12 decimal digits.
666666666666 + 666666666667 = 1333333333330
1333333333330 / 2 = 666666666665
666666666665 < 666666666666. QED.
hp
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_ | Peter J. Holzer | Story must make more sense than reality.
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| | | hjp at hjp.at | -- Charles Stross, "Creative writing
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