range_bit_count.rb

def rangeBitCount(a, b)
    x = a
    number = 0

    while (x <= b)
          string = x.to_s(2)
          y = 0

          while (y < string.length)
                if string[y] == '1' then
                   number = number + 1
                end

                y = y + 1
          end

          x = x + 1
    end

    return number
end