我怎样才能避免最后打印的 nil ? [英] How can I avoid the nil printed in the end?

问题描述

我已经编写了这个打印出板子状态的函数，但最后，由于没有返回这个函数打印一个零！

I have coded this function that prints-out the state of the board, but in the end, due to the fact that there isnt no return the function prints an nil!

功能:

(defun show-board (board)
        (dotimes (number 8)
            (dotimes (number2 8)
                (let ((pos (aref board number number2))) 
                    (cond
                        ((equal pos 0) (format t "~a " "B"))   
                        ((equal pos 1) (format t "~a " "P"))
                        (t (format t "~a " "L")))))
                    (format t "~%")))

板是一个 8x8 阵列！

A board is an 8x8 array!

命令行上的函数调用输出:

function call output on command lines:

B P B P B P B P
P B P B P B P B
B P B P B P B P
P B P B P B P B
B P B P B P B P
P B P B P B P B
B P B P B P B P
P B P B P B P B
NIL

我怎样才能摆脱 NIL??

How can i get rid of the NIL??

推荐答案

添加 (values) 作为 dotimes 的返回表单即可:

adding (values) as return form for dotimes will do it:

(dotimes (number 8 (values))
   .....)

毕竟，show-board 确实不返回任何值，对吧?

after all, show-board indeed doesn't return any values, right?

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