30 lines
511 B
Scheme
30 lines
511 B
Scheme
(define (square n) (* n n))
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(define (divides? a b)
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(= (remainder b a) 0))
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(define (find-divisor n test-divisor)
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(cond ((> (square test-divisor) n) n)
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((divides? test-divisor n) test-divisor)
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(else (find-divisor n (+ test-divisor 1)))))
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(define (smallest-divisor n)
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(find-divisor n 2))
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(define (prime? n)
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(= n (smallest-divisor n)))
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(define (t n)
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(display n)
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(if (prime? n)
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(display '-prime)
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(display '-compound))
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(newline))
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(t 2)
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(t 20)
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(t 23)
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(t 65)
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(t 67)
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(t 2011)
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