nbit

gistfile1.rb

def nbit(n1, n2)
  bits1, bits2 = n1.to_s(2), n2.to_s(2)
  bits1, bits2 = bits1.length > bits2.length ? 
    [bits1, bits2.rjust(bits1.length, "0")] : 
    [bits2, bits1.rjust(bits2.length, "0")]
  result = bits1.split("").inject([0, bits2.split("")]) do |acc, bit|
    tmp = acc[1].shift
    acc[0] += tmp == bit ? 0 : 1
    [acc[0], acc[1]]
  end
  result[0]
end