Encyclopedia > Quine

  Article Content


A quine is a computer program that produces its complete source code as its only output. It is often used for hackish amusement to try and develop the shortest possible quine in any given programming language.

Quines are named after W. V. Quine, who made an extensive study of indirect self-reference: he coined, among others, the paradox-producing expression, "yields falsehood when appended to its own quotation."

Table of contents

Sample quine in C

 char x[]="char x[]=%c%s%c;%cint main() {printf(x,34,x,34,10,10);return 0;}%c";
 int main() {printf(x,34,x,34,10,10);return 0;}

Sample quine in LISP

 ((lambda (x)
   (list x (list (quote quote) x)))
     (lambda (x)
       (list x (list (quote quote) x)))))

Sample quine in Python

 a='a=%s;print a%%`a`';print a%`a`

Sample quine in Perl


Sample quine in BASIC

10 C=": PRINT CHR(49)+CHR(48)+CHR(32)+CHR(67)+CHR(61)+CHR(34)+C+CHR(34)+C": PRINT CHR(49)+CHR(48)+CHR(32)+CHR(67)+CHR(61)+CHR(34)+C+CHR(34)+C

More examples (http://www.nyx.net/~gthompso/quine.htm)
perhaps add some more Quines here

All Wikipedia text is available under the terms of the GNU Free Documentation License

  Search Encyclopedia

Search over one million articles, find something about almost anything!
  Featured Article

...     Contents Jordanes Jordanes or Jordanis was a 6th century historian. He was an Ostrogoth and was a notary of Gothic kings in Italy. At the time of ...

This page was created in 24.2 ms