on floating-point numbers

[Dennis Lee Bieber]

On Thu, 02 Sep 2021 10:51:03 -0300, Hope Rouselle <hrouselle at jevedi.com>
declaimed the following:


>>>> ls = [7.23, 8.41, 6.15, 2.31, 7.73, 7.77]
>>>> sum(ls)
>39.599999999999994
>
>>>> ls = [8.41, 6.15, 2.31, 7.73, 7.77, 7.23]
>>>> sum(ls)
>39.60000000000001
>
>All I did was to take the first number, 7.23, and move it to the last
>position in the list.  (So we have a violation of the commutativity of
>addition.)
>

https://www.amazon.com/Real-Computing-Made-Engineering-Calculations-dp-B01K0Q03AA/dp/B01K0Q03AA/ref=mt_other?_encoding=UTF8&me=&qid=


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	Wulfraed                 Dennis Lee Bieber         AF6VN
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