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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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Task/Long-year/Scheme/long-year.ss Normal file
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(define (dec31wd year)
(remainder (apply + (map (lambda (d) (quotient year d)) '(1 4 -100 400))) 7))
(define (long? year) (or (= 4 (dec31wd year)) (= 3 (dec31wd (- year 1)))))
(display "Long years between 1800 and 2100:") (newline)
(display (filter long? (iota 300 1800)))