Created
June 7, 2013 15:58
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exericse 1.32
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(defun accumulate (combiner null-value term a next b) | |
(if (> a b) | |
null-value | |
(funcall combiner | |
(funcall term a) | |
(accumulate combiner null-value term (funcall next a) next b))) | |
) | |
(defun accumulate-iter (combiner null-value term a next b) | |
(defun iter (a result) | |
(if (> a b) | |
(print result) | |
(iter (funcall next a) | |
(funcall combiner | |
a | |
result)))) | |
(iter a null-value)) | |
(defun acc-sum (term a next b) | |
(accumulate #'+ 0 term a next b)) | |
(defun acc-sum-iter (term a next b) | |
(accumulate-iter #'+ 0 term a next b)) | |
(defun acc-product (term a next b) | |
(accumulate #'* 1 term a next b)) | |
(defun acc-product-iter (term a next b) | |
(accumulate-iter #'* 1 term a next b)) | |
(defun next (x) (+ x 1)) | |
(acc-sum #'(lambda (x) x) 1 #'next 10) | |
(acc-sum-iter #'(lambda (x) x) 1 #'next 10) | |
(acc-product #'(lambda (x) x) 1 #'next 4) | |
(acc-product-iter #'(lambda (x) x) 1 #'next 4) |
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