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PS C:\Users\Tara> clisp
  i i i i i i i       ooooo    o        ooooooo   ooooo   ooooo
  I I I I I I I      8     8   8           8     8     o  8    8
  I  \ `+' /  I      8         8           8     8        8    8
   \  `-+-'  /       8         8           8      ooooo   8oooo
    `-__|__-'        8         8           8           8  8
        |            8     o   8           8     o     8  8
  ------+------       ooooo    8oooooo  ooo8ooo   ooooo   8

Welcome to GNU CLISP 2.49 (2010-07-07) <http://clisp.cons.org/>

Copyright (c) Bruno Haible, Michael Stoll 1992, 1993
Copyright (c) Bruno Haible, Marcus Daniels 1994-1997
Copyright (c) Bruno Haible, Pierpaolo Bernardi, Sam Steingold 1998
Copyright (c) Bruno Haible, Sam Steingold 1999-2000
Copyright (c) Sam Steingold, Bruno Haible 2001-2010

Type :h and hit Enter for context help.

[1]> ;distance between points
(setf x1 2)
2
[2]> (setf y1 1)
1
[3]> (setf x2 3)
3
[4]> (setf y2 6)
6
[5]> (setf distance (sqrt (+ (expt (- x2 x1) 2) (expt (- y2 y1) 2) )))
5.0990195
[6]> ;referencing x
(car (cddr '(a b x c d )))
X
[7]> (car (car (cddr '(a b (x) c d))))
X
[8]> (cadr (cadr (car '((a(b x c d))))))
X
[9]> ;investigating colors
(setf colors '(purple mauve fuschia coral copper goldenrod yellow))
(PURPLE MAUVE FUSCHIA CORAL COPPER GOLDENROD YELLOW)
[10]> (quote colors)
COLORS
[11]> 'colors
COLORS
[12]> colors
(PURPLE MAUVE FUSCHIA CORAL COPPER GOLDENROD YELLOW)
[13]> ( describe 'colors)

COLORS is the symbol COLORS, lies in #<PACKAGE COMMON-LISP-USER>, is accessible in 1 package COMMON-LISP-USER, a
variable, value: (PURPLE MAUVE FUSCHIA CORAL COPPER GOLDENROD YELLOW).

 #<PACKAGE COMMON-LISP-USER> is the package named COMMON-LISP-USER. It has 2 nicknames CL-USER, USER.
 It imports the external symbols of 2 packages COMMON-LISP, EXT and exports no symbols, but no package uses these
 exports.

 (PURPLE MAUVE FUSCHIA CORAL COPPER GOLDENROD YELLOW) is a list of length 7.

[14]> (describe colors)

(PURPLE MAUVE FUSCHIA CORAL COPPER GOLDENROD YELLOW) is a list of length 7.

[15]> (type-of 'colors)
SYMBOL
[16]> (type-of colors)
CONS
[17]> ( typep colors 'cons)
T
[18]> ( typep colors 'list )
T
[19]> ( typep colors 'symbol )
NIL
[20]> ( typep 'colors 'cons )
NIL
[21]>