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四舍五入函数存在精度问题 #21

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GlowingRuby opened this issue Jun 7, 2022 · 1 comment

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wontfix

GlowingRuby commented Jun 7, 2022

https://github.com/thinkeridea/go-extend/blob/main/exmath/round.go
四舍五入函数存在精度问题，如0.565保留两位小数输出的是0.56而不是0.57

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thinkeridea commented Aug 3, 2022

你可能需要了解一些关于浮点数的基础知识，以下是我找到的一些资料：

https://en.wikipedia.org/wiki/IEEE_754
https://grouper.ieee.org/groups/msc/ANSI_IEEE-Std-754-2019/background/
http://c.biancheng.net/view/314.html

当前函数受浮点数算法影响，无法做到绝对的精准（浮点数本身精度并不高），只是比现有社区其它版本有所改善（精度、性能、api使用简便性），浮点数无法对精度做出保证，在较重要的数值上（例如货币）请使用更小的单位例如分进行存储和计算，展示时转换为浮点数就行展示

thinkeridea added the wontfix label

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