IP array search

ip_array_search.rb

ip = 12
arr = [1, 3, 5, 7, 9, 10, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 34, 35, 36]
index = arr.length
min = 0; max = arr.length

while (min + 1 != max) do
  index = (min + max) / 2
  if ip < arr[index]
    max = index
  else
    min = index
  end
  puts "Step:   index = #{"%3d" % index}; value = #{"%3d" % arr[index]}; min = #{"%3d" % min}; max = #{"%3d" % max}"
end

puts "\nResult: index = #{"%3d" % min}; value range = #{arr[min]}..#{arr[max]};"