/usr/lib/open-axiom/input/romnum.as is in open-axiom-test 1.4.1+svn~2626-2ubuntu2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | -- Copyright (c) 1991-2002, The Numerical ALgorithms Group Ltd.
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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)
|