如何提取Ruby中的整数符号？ [英] How to extract the sign of an integer in Ruby?

问题描述

我需要一个返回/打印整数符号的函数。到目前为止，我想出了这个：

  def extract_sign（整数）
整数> = 0？ '+'：' - '
 end 
  

是否有内置的Ruby方法这是一个简单的方法来做到这一点：

解决方案

pre> x = -3
++ - [x< => 0]＃=> -

x = 0
++ - [x< => 0]＃=> +

x = 3
++ - [x< => 0]＃=> +


或

  x = -3 
±+  - [x< => 0]＃=>  - 
 
 x = 0 
±+  - [x< => 0]＃=> ±
 
 x = 3 
±+  - [x = 0]＃=> +
  

I need a function which returns/prints the sign on an integer. So far I came up with this:

def extract_sign(integer)
  integer >= 0 ? '+' : '-'
end

Is there a built-in Ruby method which does that?

解决方案

Here is a simple way to do it:

x = -3
"++-"[x <=> 0] # => "-"

x = 0
"++-"[x <=> 0] # => "+"

x = 3
"++-"[x <=> 0] # => "+"

or

x = -3
"±+-"[x <=> 0] # => "-"

x = 0
"±+-"[x <=> 0] # => "±"

x = 3
"±+-"[x <=> 0] # => "+"

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