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QA
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Quine
/kwi:n/ n. [from the name of the logician Willard van Orman Quine, via Douglas Hofstadter] A program that generates a copy of its own source text as its complete output. Devising the shortest possible quine in some given programming language is a common hackish amusement. Here is one classic quine ((lambda (x) (list x (list (quote quote) x))) (quote (lambda (x) (list x (list (quote quote) x))))) This one works in LISP or Scheme. It's relatively easy to write quines in other languages such as Postscript which readily handle programs as data; much harder (and thus more challenging!) in languages like C which do not. Here is a classic C quine for ASCII machines char*f="char*f=%c%s%c;main() printf(f,34,f,34,10);%c"; main()printf(f,34,f,34,10); For excruciatingly exact quinishness, remove the interior line breaks. Some infamous Obfuscated C Contest entries have been quines that reproduced in exotic ways.