this post was submitted on 25 Nov 2025
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Floats for currency in a payments platform.
The system will happily take a transaction for $121.765, and every so often there's a dispute because one report ran it through round() and another through floor().
Presumably every so often there's a dispute because 0 + (0.3 + 0.3 + 0.3) - 0.3 - 0.3 - 0.3 is not equal to 0 (in floating point arithmetic).
And not the easy way of using (long) integers to count the cents.
Lmao.
Using floats for nearly anything in a finance platform should be grounds for immediate dismissal.
Did either of those do banker's rounding?