Ruby-乘法问题 [英] Ruby - Multiplication issue

问题描述

我的输出是这样的-

ruby-1.9.2-p290 :011 > 2.32 * 3
=> 6.959999999999999

我记得有一段时间我回到了另一台机器上，就像.. 2.32 * 3 = 6

And I remember sometime back on another machine I had got it like.. 2.32 * 3 = 6

我的错误是什么? 非常感谢您阅读本文. :)

What is my mistake? Thanks a ton for reading this. :)

推荐答案

如果您真的想舍入为整数，则只需

If you really want to round down to an integer then just

(3 * 2.32).to_i

但是我认为这不太可能.通常，您只想将稍微不精确的浮点数格式化为这样的格式

but I think that's unlikely. Usually you just want to format the slightly imprecise floating point number to something like this

"%0.2f" % (3 * 2.32) 
=> "6.96"

如果您真的想使用确切的表示形式，则可以使用 BigDecimal .

If you really want to work with the exact representation then you can use BigDecimal.

require 'BigDecimal'
(3 * BigDecimal.new("2.32")).to_s("F")
=> "6.96"

PS.建议阅读 http://floating-point-gui.de/ DS.

PS. Recommended read http://floating-point-gui.de/ DS.

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