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34 lines
1,016 B
Scheme
34 lines
1,016 B
Scheme
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; File: cpstak.sch
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; Description: continuation-passing version of TAK
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; Author: Will Clinger
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; Created: 20-Aug-87
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; Language: Scheme
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; Status: Public Domain
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;; CPSTAK -- A continuation-passing version of the TAK benchmark.
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;;; A good test of first class procedures and tail recursion.
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(define (cpstak x y z)
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(define (tak x y z k)
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(if (not (< y x))
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(k z)
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(tak (- x 1)
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y
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z
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(lambda (v1)
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(tak (- y 1)
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z
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x
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(lambda (v2)
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(tak (- z 1)
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x
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y
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(lambda (v3)
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(tak v1 v2 v3 k)))))))))
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(tak x y z (lambda (a) a)))
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;;; call: (cpstak 18 12 6)
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(time (cpstak 18 12 2))
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