From: Michael Hollins <mick@...>
Date: 2007-08-04T23:20:03+09:00
Subject: Re: percentage in Ruby

Tom Werner wrote:
> Li Chen wrote:
>> Hi all,
>>
>> How to write percentage in Ruby, for instance 1.2%? Do I have to change
>> it to 0.012 before I apply other operation on it? It looks like "%" is
>> used for other purpose in Ruby.
>>
>> Thanks,
>>
>> Li
>>   
> Yes, % is the modulo operator, so 1.2 percent would indeed be best 
> represented as 0.012 in your code.
> 

You could also consider adding a percent method to Numeric:

   class Numeric
     def percent
       self / 100.0
     end
   end

Then the following will work:

   assert_equal(1.percent, 0.01)
   assert_equal(1.5.percent, 0.015)

cheers,
mick