module BCD
Methods to translate to and from binary coded decimal
- Author
-
Dafydd Crosby <dafydd@dafyddcrosby.com>
- Copyright
-
Copyright 2013, Dafydd Crosby
- License
-
BSD 2-clause
Public Class Methods
decode(bcd)
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Translates binary coded decimal into an integer
# File lib/bcd.rb, line 9 def self.decode(bcd) raise ArgumentError, 'Argument is not numeric' unless bcd.is_a? Numeric raise ArgumentError, 'Cannot be a negative integer' if bcd < 0 binstring = '' while true do q, r = bcd.divmod(10) nibble = r.to_s(2) while nibble.length < 4 do nibble.prepend('0') end binstring.prepend(nibble) q == 0 ? break : bcd = q end binstring.to_i(2) end
encode(int)
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Translate an integer into binary coded decimal
# File lib/bcd.rb, line 28 def self.encode(int) raise ArgumentError, 'Argument is not numeric' unless int.is_a? Numeric raise ArgumentError, 'Cannot be a negative integer' if int < 0 bcdstring = '' while int > 0 do nibble = int % 16 bcdstring.prepend(nibble.to_s) int >>= 4 end bcdstring.to_i end