lisp - 尝试一一打印数组元素时在 CLISP 中出现错误 "variable AREF has no value "

Question

我试图在 CLISP 中打印数组的值，我在下面写了函数:

(setq x (make-array '5 :initial-contents '(a b c d e)))
(loop for i from 0 to 4 do (write aref x i))

但是我得到了错误

*** - PROGN: variable AREF has no value 
      The following restarts are available:
 USE-VALUE      :R1      Input a value to be used instead of AREF.
 STORE-VALUE    :R2      Input a new value for AREF.

我是 CLISP 的新手，不明白为什么会出现上述错误。

Answer 1

AREF是一个函数，而不是一个变量。您缺少一组括号:(aref x i):

(loop for i from 0 to 4 do (write (aref x i)))

或者只是

(loop for e across x do (write e))

附言。注意 write是一个相对低级的功能。您可能想使用 print 或 princ 的变体。