this post was submitted on 30 Jul 2026
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IEEE 754 (lemmy.ml)
submitted 1 month ago by cypherpunks@lemmy.ml to c/memes@lemmy.ml
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https://en.wikipedia.org/wiki/IEEE_754

cross-posted from: https://lemmy.ml/post/24332731

~~Stolen~~ Cross-posted from here: https://fosstodon.org/@foo/113731569632505985

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[–] the_beber@feddit.org 10 points 1 month ago (1 children)

And sometimes it seems irrational.

[–] AnnaFrankfurter@lemmy.ml 9 points 1 month ago* (last edited 1 month ago) (1 children)

And other times 0.1 + 0.2 = 0.3000004

[–] cypherpunks@lemmy.ml 5 points 1 month ago* (last edited 1 month ago)

And other times 0.1 + 0.2 = 0.3000004

0.1 + 0.2 != 0.3000004

You're off by 0.000000399999999955991114575226674787700176239013671875

(0.1 + 0.2 is actually 0.3000000000000000444089209850062616169452667236328125)

(And 0.1 is actually 0.1000000000000000055511151231257827021181583404541015625, and so on. People unfamiliar with IEEE 754 may be surprised by the output of python -c 'print("%.60f" % 0.1)')