aparler/RosettaCodeData
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Initial data commit

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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Digital-root/Factor/digital-root.factor Normal file
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USING: arrays formatting kernel math math.text.utils sequences ;
IN: rosetta-code.digital-root
: digital-root ( n -- persistence root )
0 swap [ 1 digit-groups dup length 1 > ] [ sum [ 1 + ] dip ]
while first ;
: print-root ( n -- )
dup digital-root
"%-12d has additive persistence %d and digital root %d.\n"
printf ;
{ 627615 39390 588225 393900588225 } [ print-root ] each