18 lines
No EOL
414 B
Scheme
18 lines
No EOL
414 B
Scheme
#lang sicp
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(define (square x) (* x x))
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(define (smallest-divisor n)
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(find-divisor n 2))
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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 (divides? a b)
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(= (remainder b a) 0))
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;> (smallest-divisor 199)
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;199
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;> (smallest-divisor 1999)
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;1999
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;> (smallest-divisor 19999)
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;7 |