Emacs 对elisp中格式函数的困惑

我希望得到像0 1这样的输出，但下面的代码只打印nil。我使用类型来测试（第一个十六进制），它是整数d应该有用，对吗？如果我使用message，它在Emacs中工作

(defun draw-board (board)
  (loop for x below 2
        for hex = (aref board x)
        do (format "%d " (first hex))))

(draw-board [(0 2) (1 2) (0 3) (0 2)])

---

1-emacs lisp格式不是通用lisp格式。注意丢失的 争论

(format "%d" 42) == (cl:format NIL "~D" 42)

2-因此，循环所做的唯一事情是：

 - to check that board is a vector with at least two slots. (aref
   signals an error if the index is out of bound).

 - to check that each of those two slots are lists (first signals an
   error when passed a non list).

 - to check that the first element of each each of those two slots
   are numbers. (format signals an error when you pass a non number
   for %d).

就这些

你从没说过你想打印任何东西

要打印某些内容，必须将其放入缓冲区，然后使用 ps打印缓冲区：

(defun draw-board (board)
  (with-temp-buffer
    (loop for x below 2
          for hex = (aref board x)
          do (insert (format "%d " (first hex))))
    (ps-print-buffer)))

---

1-emacs lisp格式不是通用lisp格式。注意丢失的 争论

(format "%d" 42) == (cl:format NIL "~D" 42)

2-因此，循环所做的唯一事情是：

 - to check that board is a vector with at least two slots. (aref
   signals an error if the index is out of bound).

 - to check that each of those two slots are lists (first signals an
   error when passed a non list).

 - to check that the first element of each each of those two slots
   are numbers. (format signals an error when you pass a non number
   for %d).

就这些

你从没说过你想打印任何东西

要打印某些内容，必须将其放入缓冲区，然后使用 ps打印缓冲区：

(defun draw-board (board)
  (with-temp-buffer
    (loop for x below 2
          for hex = (aref board x)
          do (insert (format "%d " (first hex))))
    (ps-print-buffer)))

---

谢谢，我误解了CommonLisp的格式函数。0_0@wvxvw

循环

是一个宏，因此您只需要使用

（编译时求值’（require'cl））

，并且如果您编译，则没有运行时惩罚。谢谢，我误解了common lisp的格式函数。0_0@wvxvw

循环

是一个宏，因此您只需要使用

（编译时求值’（require'cl））

，并且编译时不会受到运行时惩罚。