LISP (1958) =

• LISt Processing
• Lost In Single Parentheses

50th anniversary of LISP

• recursive definitions
• lists as data structure for symbolic processing
• widely used in AI
• introduced automated memory management
  • garbage collection - 40 years before it entered mainstream

(defun factorial (n)
  (if (<= n 1)
      1
      (* n (factorial (- n 1)))))

primes.el

PostScript (1982)

An example from The Blue Book

%!PS-Adobe-2.0
%%Title: Blue Book Program 1, on page 133
%%Creator: Adobe Systems Incorporated 
%%CreationDate: Thu Dec 28 13:14:59 PST 1989
%%EndComments
 
/inch {72 mul} def
 
/wedge
	{ newpath
	  0 0 moveto
	  1 0 translate
	  15 rotate
	  0 15 sin translate
	  0 0 15 sin -90 90 arc
	  closepath
	} def
 
gsave
  3.75 inch 7.25 inch translate
  1 inch 1 inch scale
  wedge 0.02 setlinewidth stroke
grestore
 
gsave
  4.25 inch 4.25 inch translate
  1.75 inch 1.75 inch scale
  0.02 setlinewidth
  1 1 12
	{ 12 div setgray
	  gsave
	    wedge
	    gsave fill grestore
	    0 setgray stroke
	  grestore
	  30 rotate
	} for
grestore
 
showpage

Save the above program as .ps file and run e.g. 'gv' on it

• result of converting to pdf

Other examples: Program 11 Program 14