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Ingy döt Net 2023-07-01 11:58:00 -04:00
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3
Task/Roman-numerals-Encode/Factor/roman-numerals-encode-1.factor Normal file
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USE: roman
( scratchpad ) 3333 >roman .
"mmmcccxxxiii"

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Task/Roman-numerals-Encode/Factor/roman-numerals-encode-2.factor Normal file
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CONSTANT: roman-digits
{ "m" "cm" "d" "cd" "c" "xc" "l" "xl" "x" "ix" "v" "iv" "i" }
CONSTANT: roman-values
{ 1000 900 500 400 100 90 50 40 10 9 5 4 1 }
ERROR: roman-range-error n ;
: roman-range-check ( n -- n )
dup 1 10000 between? [ roman-range-error ] unless ;
: >roman ( n -- str )
roman-range-check
roman-values roman-digits [
[ /mod swap ] dip <repetition> concat
] 2map "" concat-as nip ;