lispor posted @ Feb 22, 2011 02:41:35 PM in Scheme with tags SICP , 1417 阅读

练习 1.34

练习 1.34:
Suppose we define the procedure
(define (f g)
  (g 2))
Then we have
(f square)
(f (lambda (z) (* z (+ z 1))))
What happens if we (perversely) ask the interpreter to evaluate the combination (f f)? Explain.
运行 (f f) 将会提示类型错误,如下:
scheme@(guile-user)> (f f)
Error: Wrong type to apply: 2

(f f)
(f 2)
(2 2) ; 此处第一个 2 不是函数,报错
Error: Wrong type to apply: 2


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