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Decimal to Base 36 / Base 36 to Decimal

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  1. DIGITS = ('0'..'9').to_a + ('A'..'Z').to_a
  2.  
  3. def to_base36_from_l(num)
  4. 	result = ""
  5. 	while num != 0
  6. 		tmp = num / DIGITS.length
  7. 		remainder = num - tmp * DIGITS.length
  8. 		char = DIGITS[remainder]
  9. 		num = tmp
  10. 		result = char + result
  11. 	end
  12. 	result
  13. end
  14.  
  15. def to_l_from_base36(str)
  16. 	answer = 0
  17. 	str.reverse.split("").each_with_index { |c, i|
  18. 		answer += (DIGITS.index(c) * (DIGITS.length ** i))
  19. 	}
  20. 	answer
  21. end
  22.  
  23. # sample usage
  24.  
  25. num = 1451252361345125
  26.  
  27. base36 = to_base36_from_l(num)
  28. puts "#{base36} from #{to_l_from_base36(base36)}"
  29.  
  30. # output: EAFC4PPW85 from 1451252361345125

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