Return the number of odd numbers preceding a given number

num_of_odd_numbers.rb

# Return the number of odd numbers preceding a given number
# usage:
# puts Numberofoddnumbers::get(num)
# puts Numberofoddnumbers::get(num, 7) # will get all the odd numbers until 7
#
# blog post http://blog.moski.me/2012/05/drawing-hearts-in-ruby.html
#
module Numberofoddnumbers
  def self.get(number, start_from=1)
    sum = 0
    for i in start_from..number do
      sum = sum + 1 if i % 2 == 1
    end
    sum
  end
end