I want any items that are rounded such as this:
我想要任何整数的项目，例如:
(5.101 * 100).round / 100.0
To be output like this:
输出如下:
5.10
Instead of this:
而不是:
5.1
How do I do this in Ruby?
我怎么用Ruby来做这个?
2 个解决方案
#1
16
There are a couple ways, but I favor using String's % (format) operator:
有几种方法，但是我喜欢使用字符串的%(格式)运算符:
'%.2f' % [(5.101 * 100).round / 100.0] # => "5.10"
Kernel's sprintf method has the documentation for the various flags and modifiers. There's also Kernel's printf but, like I said, I'd go with %.
内核的sprintf方法有各种标志和修饰符的文档。还有内核的printf，但是，就像我说的，我选择%。
#2
9
I hope it will help you.
我希望它能对你有所帮助。
2.0.0p195 :002 > (52.452158744).round(2)
=> 52.45
2.0.0p195 :003 > (20.452158744).round(2)
=> 20.45
2.0.0p195 :004 > (20.002555).round(2)
=> 20.0
2.0.0p195 :005 > (20.012555).round(2)
=> 20.01
#1
16
There are a couple ways, but I favor using String's % (format) operator:
有几种方法，但是我喜欢使用字符串的%(格式)运算符:
'%.2f' % [(5.101 * 100).round / 100.0] # => "5.10"
Kernel's sprintf method has the documentation for the various flags and modifiers. There's also Kernel's printf but, like I said, I'd go with %.
内核的sprintf方法有各种标志和修饰符的文档。还有内核的printf，但是，就像我说的，我选择%。
#2
9
I hope it will help you.
我希望它能对你有所帮助。
2.0.0p195 :002 > (52.452158744).round(2)
=> 52.45
2.0.0p195 :003 > (20.452158744).round(2)
=> 20.45
2.0.0p195 :004 > (20.002555).round(2)
=> 20.0
2.0.0p195 :005 > (20.012555).round(2)
=> 20.01