安装环境

 

$ brew install sbcl

安装完毕后使用 sbcl 启动交互环境。 sbcl 这是一个REPL(read–eval–print loop )。

 

开始Common Lisp编程：

 

$ sbcl
This is SBCL 1.5.6, an implementation of ANSI Common Lisp.
More information about SBCL is available at <http://www.sbcl.org/>.

SBCL is free software, provided as is, with absolutely no warranty.
It is mostly in the public domain; some portions are provided under
BSD-style licenses.  See the CREDITS and COPYING files in the
distribution for more information.
* 1
1
* 1+2

debugger invoked on a UNBOUND-VARIABLE in thread
#<THREAD "main thread" RUNNING {10004F04C3}>:
  The variable |1+2| is unbound.

Type HELP for debugger help, or (SB-EXT:EXIT) to exit from SBCL.

restarts (invokable by number or by possibly-abbreviated name):
  0: [CONTINUE   ] Retry using |1+2|.
  1: [USE-VALUE  ] Use specified value.
  2: [STORE-VALUE] Set specified value and use it.
  3: [ABORT      ] Exit debugger, returning to top level.

简单数字计算

0] (+ 1 2)             

3

0] (* 99 99)

9801

定义函数

(defun avg (x1 x2 x3)
      (/ (+ x1 x2 x3) 3))


(avg 100 80 70)
250/3

在 Lisp 的另外一个方言 Clojure 上：

user=> (defn avg [x1 x2 x3]
          (/ (+ x1 x2 x3) 3))

user=> (avg 12 13 14)
13

 

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