From: Chandramouli Parasuraman <contactmouli@...>
Date: 2010-05-04T19:59:32+09:00
Subject: Calculation in a block

Hi,

I'm new to ruby, and I am trying to add all the natural numbers below
one thousand that are multiples of 3 or 5. (exercise from ProjectEuler)

Here's my code:

class Array
  def sumNumbers
    sum = 0
    self.each_with_index { |n, i|
    if ((self[i] % 3) == 0 || (self[i] % 5) == 0)
      sum += self[i]
    end
  }
  sum
  end
end

numbers = [1..1000]
print "Sum of natural numbers till 1000 that are multiples of 3 or 5 is
" + numbers.sumNumbers

When I try to execute this, I get this error:

SumOfMults.rb:5:in `block in sumNumbers': undefined method `%' for
1..1000:Range
 (NoMethodError)
        from SumOfMults.rb:4:in `each'
        from SumOfMults.rb:4:in `each_with_index'
        from SumOfMults.rb:4:in `sumNumbers'
        from SumOfMults.rb:14:in `<main>'

Not sure how self[i] is actually treated as a Range.  Can you please let
me know what's wrong in my code?

Thanks,
Mouli
-- 
Posted via http://www.ruby-forum.com/.