A nearly verbatim translation to Ruby: 
$rtoa = { :M=>1000, :D=>500, :C=>100, :L=>50, :X=>10, :V=>5, :I=>1 }

def roman_to_dec(roman)
  roman.split(//).map { |c| $rtoa[c.upcase.to_sym] }.reduce { |t, n | 
+t+n-t%n*2  }
end

%w[ XLII LXIX mi ].each { |r| puts roman_to_dec r }

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In reply to Re: Rosetta PGA-TRAM by Arunbear
in thread Rosetta PGA-TRAM by eyepopslikeamosquito

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