(write-line "single quote not used, so expression evaluated") (write (* 2 3)) 当单击Execute按钮,或按下Ctrl+ E,LISP立即执行它,返回的结果是: single quote used, it inhibits evaluation (* 2 3) single quote not used, so expression evaluated 6 LISP - 数据类型 - Lisp教程 在LISP中,变量没...
(equal (vla-get-name currentLayer) selLayer)) (progn (vla-putLayerOn currentLayer :vlax-false) ) ) setqIndex (1+ layerIndex)) ) ) princ);001.长度(defun :LM() (prompt"请选择要标注长度的线段:") (setq (getvar "cmdecho")) (setvar"cmdecho" 0) (while(setq...
First, it is important to remember that Lisp does not attach any external significance to the objects it manipulâtes. For example, we naturally think of (Robin Sandy) as a list of two first names, and (John Q Public) as a list of one person's first name, middle initial, and last ...
Python is more dynamic, does less error-checking. 在 Python中,对于未定义的函数或者域,或者传给了函数错误的参数个数,或者其他载入阶段的其他大多数问题,你都不会得到任何警告信息;你必须等到运行 时,才能得到错误信息。商业的Lisp实现将会把这些大多数问题标识为警告;简单的Lisp实现(如clisp)不会。一个演示Pyt...
Python is more dynamic, does less error-checking.在Python中,对于未定义的函数或者域,或者传给了函数错误的参数个数,或者其他载入阶段的其他大多数问题,你都不会得到任何警告信息;你必须等到运行时,才能得到错误信息。商业的Lisp实现将会把这些大多数问题标识为警告;简单的Lisp实现(如clisp)不会。一个演示Python危...
(formatt"~&The specified directory ~A does not exists try to create it~%"*bindir*) (let((mkdir-status(ensure-directories-exist (uiop:native-namestring*bindir*))) (when(notmkdir-status) (error"~&Directory ~A creation failed, cannot continue~%"*bindir*) (...
Assume that a function set assigns some value to a symbol (like = does in Java or C++). The following are all valid examples: set(test, 5) // symbol 'test' will equal an integer 5 set(=, 5) // symbol '=' will equal an integer 5 set(test, "hello") // symbol 'test' will...
;ornil,ifthe node doesnothave any (defunnext-sibling(tree) (cdr tree) ) 第5步:返回节点中信息的函数。 Lisp实现 ;afunctiontoreturnthe informationina node (defun data(tree) (car(car tree)) ) 现在让我们通过将上面编写的代码组合到一个文件中来构建一棵完整的树。
Although I may addPROGand perhapsSET[Q]one day, that's about where I'd draw the line. I plan to use this as a teaching tool, not a practical programming environment. It does do one important thing differently from the book, though: lexical scoping. There is no association list; instead...
Although the compiler doesn't include any iteration constructs, it does provide tail-call optimisation which can make recursive programs as efficient as iterative ones. Consider this recursive program to add two positive numbers: (defun add (a b) ...