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Big Decimals: Stop Using Floats or Cents for Money (medium.com)
submitted 2 weeks ago by Trev13@programming.dev to c/programming@programming.dev
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[-] FizzyOrange@programming.dev 2 points 2 weeks ago

That is default IEEE behaviour: https://en.wikipedia.org/wiki/Rounding#Rounding_half_to_even

This is the default rounding mode used in IEEE 754 operations for results in binary floating-point formats.

Though it's definitely a bad default because it's so surprising. Javascript and Rust do not do this.

Not really anything to do with determinism though.

this post was submitted on 24 Sep 2025
101 points (97.2% liked)

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