Ruby:在 Ruby 中舍入浮点数 [英] Ruby: Rounding float in Ruby

问题描述

我在四舍五入时遇到问题.我有一个浮点数，我想四舍五入到小数点的百分之一.但是，我只能使用 .round 基本上把它变成一个 int，意思是 2.34.round # =>2. 有没有一种简单的效果方式可以做2.3465#=>之类的事情?2.35

I'm having problems rounding. I have a float, which I want to round to the hundredth of a decimal. However, I can only use .round which basically turns it into an int, meaning 2.34.round # => 2. Is there a simple effect way to do something like 2.3465 # => 2.35

推荐答案

显示时可以使用(例如)

When displaying, you can use (for example)

>> '%.2f' % 2.3465
=> "2.35"

如果你想把它四舍五入存储，你可以使用

If you want to store it rounded, you can use

>> (2.3465*100).round / 100.0
=> 2.35

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