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我的不成熟的代码: ;重新定义make-sum过程,接受参数列表, 并整合成一个和式 (define (make-sum . items) (define (iter result x) (if (null? x) result (let ((first (car x))) (if (=number? first 0) (iter result (cdr x)) (iter (append result (list first)) (cdr x)))))) (let ((add (iter '() items))) (if (null? (cdr add)) (car add) (append '(+) add)))) ;重新定义过程make-product, 接受参数列表, 并整合成一个乘式 (define (make-product . items) (define (iter result x) (if (null? x) result (let ((first (car x))) (cond ((=number? first 0) (list 0)) ((=number? first 1) (iter result (cdr x))) (else (iter (append result (list first)) (cdr x))))))) (let ((mul (iter '() items))) (if (null? (cdr mul)) (car mul) (append '(*) mul))))
The text was updated successfully, but these errors were encountered:
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我的不成熟的代码:
;重新定义make-sum过程,接受参数列表, 并整合成一个和式
(define (make-sum . items)
(define (iter result x)
(if (null? x)
result
(let ((first (car x)))
(if (=number? first 0)
(iter result (cdr x))
(iter (append result (list first))
(cdr x))))))
(let ((add (iter '() items)))
(if (null? (cdr add))
(car add)
(append '(+) add))))
;重新定义过程make-product, 接受参数列表, 并整合成一个乘式
(define (make-product . items)
(define (iter result x)
(if (null? x)
result
(let ((first (car x)))
(cond ((=number? first 0) (list 0))
((=number? first 1)
(iter result (cdr x)))
(else (iter (append result (list first))
(cdr x)))))))
(let ((mul (iter '() items)))
(if (null? (cdr mul))
(car mul)
(append '(*) mul))))
The text was updated successfully, but these errors were encountered: