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/usr/share/axiom-20120501/input/romnum.as is in axiom-test 20120501-8.

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-- Copyright (c) 1991-2002, The Numerical ALgorithms Group Ltd.
-- All rights reserved.
--
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-- modification, are permitted provided that the following conditions are
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#pile
#include "axiom.as"

RomanNumber : IntegerNumberSystem  == Integer add
        import from NumberFormats
        coerce(r:%):OutputForm ==
            import from Integer
            n := convert(r)@Integer
            -- okay, we stretch it
            zero? n => n::OutputForm
            negative? n => - ((-r)::OutputForm)
            import from PositiveInteger
            message FormatRoman(n::PositiveInteger)