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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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Task/Casting-out-nines/Racket/casting-out-nines.rkt Normal file
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#lang racket
(require math)
(define (digits n)
(map (compose1 string->number string)
(string->list (number->string n))))
(define (cast-out-nines n)
(with-modulus 9
(for/fold ([sum 0]) ([d (digits n)])
(mod+ sum d))))