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4.4 #24

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INotWant opened this issue Feb 25, 2020 · 0 comments

INotWant commented Feb 25, 2020

(define (eval-or exp env)
  (if (null? exp)
    true
    (or (eval (car exp) env)
        (eval-or (cdr exp) env))))

应该为

(define (eval-or exp env)
  (if (null? exp)
    false
    (or (eval (car exp) env)
        (eval-or (cdr exp) env))))

后面实现为派生表达式，我认为应该为

(define (eval-and exp env)
    (make-if (null? exp)
        true
        (make-if (car exp)
            (eval-add (cdr exp) env)
            false)))

但是，我感觉用派生表示式的话，就没有短路效果了！

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