Quine
In the Scots language, a quean or quine is a girl or young woman.
In computing, A quine is a program that produces its complete source code as its only output.
For amusement, hackers sometimes attempt to 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."
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)))
(quote
(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
$_=q{$_=q{Q};s/Q/$_/;print};s/Q/$_/;print
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
Sample quine in Pascal
const a='const a=';b='begin write(a,#39,a,#39#59#98#61#39,b,#39#59#10,b) end.';
begin write(a,#39,a,#39#59#98#61#39,b,#39#59#10,b) end.
(note: This should be one continuous line of code, but line
breaks have been added for the ease reading on screens that
are not extremely wide)
->+>+++>>+>++>+>+++>>+>++>>>+>+>+>++>+>>>>+++>+>>++>+>+++>>++>++>>+>>+>++>++>
+>>>>+++>+>>>>++>++>>>>+>>++>+>+++>>>++>>++++++>>+>>++>+>>>>+++>>+++++>>+>+++
>>>++>>++>>+>>++>+>+++>>>++>>+++++++++++++>>+>>++>+>+++>+>+++>>>++>>++++>>+>>
++>+>>>>+++>>+++++>>>>++>>>>+>+>++>>+++>+>>>>+++>+>>>>+++>+>>>>+++>>++>++>+>+
++>+>++>++>>>>>>++>+>+++>>>>>+++>>>++>+>+++>+>+>++>>>>>>++>>>+>>>++>+>>>>+++>
+>>>+>>++>+>++++++++++++++++++>>>>+>+>>>+>>++>+>+++>>>++>>++++++++>>+>>++>+>>
>>+++>>++++++>>>+>++>>+++>+>+>++>+>+++>>>>>+++>>>+>+>>++>+>+++>>>++>>++++++++
>>+>>++>+>>>>+++>>++++>>+>+++>>>>>>++>+>+++>>+>++>>>>+>+>++>+>>>>+++>>+++>>>+
->>+<<<+]+++++[->+++++++++<]>.[+]>>[<<+++++++[->+++++++++<]>-]
.------------------->-[-<.<+>>]<[+]<+>>>]<<<[-[-[-[>>+<++++++[->+++++<]]>++++]]]
++++++++++<]>+++<]++++++[->+++++++<]>+<<<-[->>>++<<<]>[->>.<<]<<]
More examples
perhaps add some more quines here
A quine is a special form of metaprogramme
See also self-interpreter
Referenced By
Conceptual metaphor | Curry's paradox | Define | DefinitioN | Donald Davidson (philosopher) | Indirect self-reference | Lexical definition of definition | Meta programming | Metaprogramming | Term Logic | W.V.O. Quine | W.V. Quine | W. V. O. Quine | W. V. Quine | W Quine
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