Quine
You are encouraged to solve this task according to the task description, using any language you may know.
A quine is a self-referential program that can, without any external access, output its own source.
A quine (named after Willard Van Orman Quine) is also known as:
- self-reproducing automata (1972)
- self-replicating program or self-replicating computer program
- self-reproducing program or self-reproducing computer program
- self-copying program or self-copying computer program
It is named after the philosopher and logician who studied self-reference and quoting in natural language, as for example in the paradox "'Yields falsehood when preceded by its quotation' yields falsehood when preceded by its quotation."
"Source" has one of two meanings. It can refer to the text-based program source. For languages in which program source is represented as a data structure, "source" may refer to the data structure: quines in these languages fall into two categories: programs which print a textual representation of themselves, or expressions which evaluate to a data structure which is equivalent to that expression.
The usual way to code a quine works similarly to this paradox: The program consists of two identical parts, once as plain code and once quoted in some way (for example, as a character string, or a literal data structure). The plain code then accesses the quoted code and prints it out twice, once unquoted and once with the proper quotation marks added. Often, the plain code and the quoted code have to be nested.
- Task
Write a program that outputs its own source code in this way. If the language allows it, you may add a variant that accesses the code directly. You are not allowed to read any external files with the source code. The program should also contain some sort of self-reference, so constant expressions which return their own value which some top-level interpreter will print out. Empty programs producing no output are not allowed.
There are several difficulties that one runs into when writing a quine, mostly dealing with quoting:
- Part of the code usually needs to be stored as a string or structural literal in the language, which needs to be quoted somehow. However, including quotation marks in the string literal itself would be troublesome because it requires them to be escaped, which then necessitates the escaping character (e.g. a backslash) in the string, which itself usually needs to be escaped, and so on.
- Some languages have a function for getting the "source code representation" of a string (i.e. adds quotation marks, etc.); in these languages, this can be used to circumvent the quoting problem.
- Another solution is to construct the quote character from its character code, without having to write the quote character itself. Then the character is inserted into the string at the appropriate places. The ASCII code for double-quote is 34, and for single-quote is 39.
- Newlines in the program may have to be reproduced as newlines in the string, which usually requires some kind of escape sequence (e.g. "\n"). This causes the same problem as above, where the escaping character needs to itself be escaped, etc.
- If the language has a way of getting the "source code representation", it usually handles the escaping of characters, so this is not a problem.
- Some languages allow you to have a string literal that spans multiple lines, which embeds the newlines into the string without escaping.
- Write the entire program on one line, for free-form languages (as you can see for some of the solutions here, they run off the edge of the screen), thus removing the need for newlines. However, this may be unacceptable as some languages require a newline at the end of the file; and otherwise it is still generally good style to have a newline at the end of a file. (The task is not clear on whether a newline is required at the end of the file.) Some languages have a print statement that appends a newline; which solves the newline-at-the-end issue; but others do not.
Next to the Quines presented here, many other versions can be found on the Quine page.
- Related task
8080 Assembly
org 100h
lxi b,P
call A
lxi d,P
jmp B
A: ldax b
ana a
rz
call G
inx b
jmp A
B: lxi h,C
call H
mvi c,16
D: mvi a,48
call G
ldax d
call E
mvi a,104
call G
ldax d
ana a
rz
inx d
dcr c
jz B
mvi a,44
call G
jmp D
E: push psw
rlc
rlc
rlc
rlc
call F
pop psw
F: ani 15
adi 48
cpi 58
jc G
adi 7
G: push h
push d
push b
push psw
mov e,a
mvi c,2
call 5
pop psw
r: pop b
pop d
pop h
ret
H: push b
push d
push h
xchg
mvi c,9
call 5
jmp r
C: db 13,10,9,'db',9,'$'
P:
db 009h,06Fh,072h,067h,009h,031h,030h,030h,068h,00Dh,00Ah,009h,06Ch,078h,069h,009h
db 062h,02Ch,050h,00Dh,00Ah,009h,063h,061h,06Ch,06Ch,009h,041h,00Dh,00Ah,009h,06Ch
db 078h,069h,009h,064h,02Ch,050h,00Dh,00Ah,009h,06Ah,06Dh,070h,009h,042h,00Dh,00Ah
db 041h,03Ah,009h,06Ch,064h,061h,078h,009h,062h,00Dh,00Ah,009h,061h,06Eh,061h,009h
db 061h,00Dh,00Ah,009h,072h,07Ah,00Dh,00Ah,009h,063h,061h,06Ch,06Ch,009h,047h,00Dh
db 00Ah,009h,069h,06Eh,078h,009h,062h,00Dh,00Ah,009h,06Ah,06Dh,070h,009h,041h,00Dh
db 00Ah,042h,03Ah,009h,06Ch,078h,069h,009h,068h,02Ch,043h,00Dh,00Ah,009h,063h,061h
db 06Ch,06Ch,009h,048h,00Dh,00Ah,009h,06Dh,076h,069h,009h,063h,02Ch,031h,036h,00Dh
db 00Ah,044h,03Ah,009h,06Dh,076h,069h,009h,061h,02Ch,034h,038h,00Dh,00Ah,009h,063h
db 061h,06Ch,06Ch,009h,047h,00Dh,00Ah,009h,06Ch,064h,061h,078h,009h,064h,00Dh,00Ah
db 009h,063h,061h,06Ch,06Ch,009h,045h,00Dh,00Ah,009h,06Dh,076h,069h,009h,061h,02Ch
db 031h,030h,034h,00Dh,00Ah,009h,063h,061h,06Ch,06Ch,009h,047h,00Dh,00Ah,009h,06Ch
db 064h,061h,078h,009h,064h,00Dh,00Ah,009h,061h,06Eh,061h,009h,061h,00Dh,00Ah,009h
db 072h,07Ah,00Dh,00Ah,009h,069h,06Eh,078h,009h,064h,00Dh,00Ah,009h,064h,063h,072h
db 009h,063h,00Dh,00Ah,009h,06Ah,07Ah,020h,009h,042h,00Dh,00Ah,009h,06Dh,076h,069h
db 009h,061h,02Ch,034h,034h,00Dh,00Ah,009h,063h,061h,06Ch,06Ch,009h,047h,00Dh,00Ah
db 009h,06Ah,06Dh,070h,009h,044h,00Dh,00Ah,045h,03Ah,009h,070h,075h,073h,068h,009h
db 070h,073h,077h,00Dh,00Ah,009h,072h,06Ch,063h,00Dh,00Ah,009h,072h,06Ch,063h,00Dh
db 00Ah,009h,072h,06Ch,063h,00Dh,00Ah,009h,072h,06Ch,063h,00Dh,00Ah,009h,063h,061h
db 06Ch,06Ch,009h,046h,00Dh,00Ah,009h,070h,06Fh,070h,009h,070h,073h,077h,00Dh,00Ah
db 046h,03Ah,009h,061h,06Eh,069h,009h,031h,035h,00Dh,00Ah,009h,061h,064h,069h,009h
db 034h,038h,00Dh,00Ah,009h,063h,070h,069h,009h,035h,038h,00Dh,00Ah,009h,06Ah,063h
db 009h,047h,00Dh,00Ah,009h,061h,064h,069h,009h,037h,00Dh,00Ah,047h,03Ah,009h,070h
db 075h,073h,068h,009h,068h,00Dh,00Ah,009h,070h,075h,073h,068h,009h,064h,00Dh,00Ah
db 009h,070h,075h,073h,068h,009h,062h,00Dh,00Ah,009h,070h,075h,073h,068h,009h,070h
db 073h,077h,00Dh,00Ah,009h,06Dh,06Fh,076h,009h,065h,02Ch,061h,00Dh,00Ah,009h,06Dh
db 076h,069h,009h,063h,02Ch,032h,00Dh,00Ah,009h,063h,061h,06Ch,06Ch,009h,035h,00Dh
db 00Ah,009h,070h,06Fh,070h,009h,070h,073h,077h,00Dh,00Ah,072h,03Ah,009h,070h,06Fh
db 070h,009h,062h,00Dh,00Ah,009h,070h,06Fh,070h,009h,064h,00Dh,00Ah,009h,070h,06Fh
db 070h,009h,068h,00Dh,00Ah,009h,072h,065h,074h,00Dh,00Ah,048h,03Ah,009h,070h,075h
db 073h,068h,009h,062h,00Dh,00Ah,009h,070h,075h,073h,068h,009h,064h,00Dh,00Ah,009h
db 070h,075h,073h,068h,009h,068h,00Dh,00Ah,009h,078h,063h,068h,067h,00Dh,00Ah,009h
db 06Dh,076h,069h,009h,063h,02Ch,039h,00Dh,00Ah,009h,063h,061h,06Ch,06Ch,009h,035h
db 00Dh,00Ah,009h,06Ah,06Dh,070h,009h,072h,00Dh,00Ah,043h,03Ah,009h,064h,062h,009h
db 031h,033h,02Ch,031h,030h,02Ch,039h,02Ch,027h,064h,062h,027h,02Ch,039h,02Ch,027h
db 024h,027h,00Dh,00Ah,050h,03Ah,000h
ABAP
I copied one of my examples from http://www.yaabb.de/viewtopic.php?t=44
REPORT R NO STANDARD PAGE HEADING LINE-SIZE 67.
DATA:A(440),B,C,N(3) TYPE N,I TYPE I,S.
A+000 = 'REPORT R NO STANDARD PAGE HEADING LINE-SIZE 6\7.1DATA:A'.
A+055 = '(440),B,C,N(\3) TYPE N,I TYPE I,S.?1DO 440 TIMES.3C = A'.
A+110 = '+I.3IF B = S.5IF C CA `\\\?\1\3\5\7`.7B = C.5ELSEIF C ='.
A+165 = ' `\``.7WRITE ```` NO-GAP.5ELSE.7WRITE C NO-GAP.5ENDIF.3'.
A+220 = 'ELSEIF B = `\\`.5WRITE C NO-GAP.5B = S.3ELSEIF B = `\?`'.
A+275 = '.5DO 8 TIMES.7WRITE:/ `A+` NO-GAP,N,`= ``` NO-GAP,A+N(\'.
A+330 = '5\5) NO-GAP,```.`.7N = N + \5\5.5ENDDO.5B = C.3ELSE.5WR'.
A+385 = 'ITE AT /B C NO-GAP.5B = S.3ENDIF.3I = I + \1.1ENDDO. '.
DO 440 TIMES.
C = A+I.
IF B = S.
IF C CA '\?1357'.
B = C.
ELSEIF C = '`'.
WRITE '''' NO-GAP.
ELSE.
WRITE C NO-GAP.
ENDIF.
ELSEIF B = '\'.
WRITE C NO-GAP.
B = S.
ELSEIF B = '?'.
DO 8 TIMES.
WRITE:/ 'A+' NO-GAP,N,'= ''' NO-GAP,A+N(55) NO-GAP,'''.'.
N = N + 55.
ENDDO.
B = C.
ELSE.
WRITE AT /B C NO-GAP.
B = S.
ENDIF.
I = I + 1.
ENDDO.
Here is another one, requiring SY-SAPRL >= '620':
REPORT R NO STANDARD PAGE HEADING.DATA:A TYPE TABLE OF STRING,B(8).APPEND:
`REPORT.FORM F TABLES T.NEW-PAGE LINE-SIZE 78.WRITE:'REPORT R NO',` TO A,
`'STANDARD PAGE HEADING.DATA:A TYPE TABLE OF STRING,B(8).APPEND:'.LOOP` TO A,
`AT T.REPLACE ALL OCCURENCES OF'``' IN T WITH'````'.WRITE:/'``'` TO A,
`NO-GAP,T NO-GAP,'`` TO A,'.ENDLOOP.WRITE:AT 78'.','GENERATE',` TO A,
`'SUBROUTINE POOL A NAME B.PERFORM F IN PROGRAM (B) TABLES A.'.ENDFORM.` TO A.
GENERATE SUBROUTINE POOL A NAME B.PERFORM F IN PROGRAM (B) TABLES A.
Please note that the program still works if you fix the spelling error (s/OCCURENCES/OCCURRENCES/), thus increasing the size of the source code by 1 character.
One more program, created in a 7.0 unicode system, but it should work in any SAP system with SY-SAPRL >= '700', even if you'll have a hard time verifying the correctness just by studying the source code:
REPORT A NO STANDARD
PAGE HEADING
LINE-SIZE
72.DATA:C(33),A LIKE
TABLE OF C,X(3333)
TYPE X,Y TYPE
XSTRING.DEFINE A.X+C
='&1'.C = C + 33.
END-OF-DEFINITION.
DEFINE B.LOOP AT A
INTO C &1 &2.WRITE
/ C.ENDLOOP.
END-OF-DEFINITION.
A FF060201020280003431303300000000AC030000121F9D02BB522ADA69108AA1C7 .
A E8B32FFEC07DD21907936962B28407983089732C8811FC4413FD02A7BFE6690B03 .
A 262F72B38EF69EB6A7A71C9F82CF44CC11469E081F86785777F269DE372CE9EC4B .
A 5E0A24D8224781128E290E1B7A0ECFF423BEDFD316B43B456FE9AD98E1F0401B31 .
A 9E11B3A23F3C865EEB6D028FD532BC69DED831F41DE6F0B59F745E604996373C97 .
A 982A2FA9F6C81A86164CCC98D4CC91D22E89AB9A1CCBEB6A97A839A5602BA26AFE .
A 7791BF4C2A9DBE6866134E093BD82CA291CF2A57EC67E81017384740EB33E6102A .
A 174784531EFEA076A29A7ACAD9EB55CED8316374D3E00D3DEC1CF36E4D4C4EE64E .
A 75B28DB568C195BA3DE92F9CC48AAAAF3A4DD9CC6BE899E27C18A3B66ECBF65093 .
A FFF1168545878AD10C4F075F588821EF947739516EBF7D99F5851D52F629E8D5AC .
A 13EF77291306AA6CABF7B56EC9E273F47997DA3FE146FB2A2C30E3BE22FEA603B4 .
A EDB5FBEE64A7637B35B46DD79491EEC2D1A19B26C0ADAAB2FB39F9050000000000 .
Y = X.IMPORT A = A
FROM DATA BUFFER Y.B
TO 13.C = 0.DO 12
TIMES.WRITE:/'A',
X+C(33),'.'.C = C +
33.ENDDO.B FROM 14.
And a final one (cheating, even though not using READ REPORT), it should work in any SAP system with SY-SAPRL >= '46B':
.REPORT Q NO STANDARD PAGE HEADING LINE-SIZE 72
.DATA QQ(69) OCCURS 0
.DATA Q LIKE QQ WITH HEADER LINE
.APPEND 'SYNTAX-TRACE ON.INCLUDE' TO QQ
.APPEND SY-REPID TO QQ
.APPEND '.' TO QQ
.SYNTAX-CHECK FOR QQ MESSAGE Q LINE Q WORD Q TRACE-TABLE Q
.LOOP AT Q
.CHECK Q(1) = '#'
.Q = Q+5
.IF Q < Q OR SY-SAPRL > '5'
.SPLIT Q AT '' INTO Q Q
.ENDIF
.IF Q < Q OR SY-LINNO < 22
.CHECK Q CA 'Q.' OR Q+4 = 'F'
.ENDIF
.IF Q < Q OR SY-LINNO > 23
.CHECK Q CA '.'
.ENDIF
.CHECK Q(1) NA 'IT+' OR Q+1(1) = 'F'
.WRITE / '.' NO-GAP
.WRITE Q
.ENDLOOP
.WRITE / '.'
.
ACL2
(defun print-quine (quine)
(cw quine quine))
(print-quine
"(defun print-quine (quine)
(cw quine quine))
(print-quine ~x0)~%")
A shorter one:
(let((q"(let((q~x0))(cw q q))"))(cw q q))
Acornsoft Lisp
((lambda (s) (list s (list (quote quote) s)))
(quote (lambda (s) (list s (list (quote quote) s)))))
Ada
The program text must be in one line.
with Ada.Text_IO;procedure Self is Q:Character:='"';A:String:="with Ada.Text_IO;procedure Self is Q:Character:='';A:String:=;begin Ada.Text_IO.Put_Line(A(1..49)&Q&A(50..61)&Q&A&Q&A(62..A'Last));end Self;";begin Ada.Text_IO.Put_Line(A(1..49)&Q&A(50..61)&Q&A&Q&A(62..A'Last));end Self;
Aime
integer f;
text s, t;
f = 36;
s = "integer f;
text s, t;
f = 36;
s = \"\";
o_text(cut(s, 0, f));
o_text(cut(s, 0, f - 1));
o_etext(cut(s, f - 1, 2));
o_text(cut(s, f + 1, 8888 - f));
o_text(cut(s, f, 8888 - f));
";
o_text(cut(s, 0, f));
o_text(cut(s, 0, f - 1));
o_etext(cut(s, f - 1, 2));
o_text(cut(s, f + 1, 8888 - f));
o_text(cut(s, f, 8888 - f));
ALGOL 68
The following program assumes that the target machine is ASCII, hence the use of character 34 as a double quote.
STRINGa="STRINGa=,q=REPR34;print(a[:8]+q+a+q+a[9:])",q=REPR34;print(a[:8]+q+a+q+a[9:])
The following is a shorter and character set independent - hence portable - implementation.
[]CHARa="[]CHARa="";print(2*a[:9]+2*a[9:])";print(2*a[:9]+2*a[9:])
The original program - from which this is derived - was written by Richard Wendland, who is one of the team who implemented Algol 68 on Honeywell's Multics. The original can be found in Algol Bulletin 46 - 2.1 - Page 5.
APL
1⌽,⍨9⍴'''1⌽,⍨9⍴''' ⍝ Author: Nikolay Nikolov; Source: https://dfns.dyalog.com/n_quine.htm
Applesoft BASIC
10 LIST
Arturo
block: [print ["block:" as .code block "do block"]] do block
- Output:
block: [print ["block:" as .code block "do block"]] do block
AutoHotkey
All from http://www.autohotkey.com/forum/viewtopic.php?t=14336: The "cheating" way:
FileRead, quine, %A_ScriptFullPath%
MsgBox % quine
Another:
D(n, s)
{
global
Loop %n%
{
l := %s%%A_Index%
If l = #
l := "script =" . nl . "( %" . nl . script . nl . ")"
FileAppend %l%%nl%, %A_ScriptDir%\Q.txt
}
}
nl := Chr(13) . Chr(10)
script =
( %
D(n, s)
{
global
Loop %n%
{
l := %s%%A_Index%
If l = #
l := "script =" . nl . "( %" . nl . script . nl . ")"
FileAppend %l%%nl%, %A_ScriptDir%\Q.txt
}
}
nl := Chr(13) . Chr(10)
#
StringSplit q, script, %nl%
D(q0, "q")
)
StringSplit q, script, %nl%
D(q0, "q")
Another:
quote := Chr(34)
sep := Chr(36)
nl := Chr(13) . Chr(10)
script := "quote := Chr(34)$sep := Chr(36)$nl := Chr(13) . Chr(10)$script := #$s := script$StringReplace script, script, %sep%, %nl%, All$StringReplace script, script, #, %quote%%s%%quote%$FileAppend %script%, %A_ScriptDir%\Q.txt"
s := script
StringReplace script, script, %sep%, %nl%, All
StringReplace script, script, #, %quote%%s%%quote%
FileAppend %script%, %A_ScriptDir%\Q.txt
Another "cheating" method:
FileCopy, %A_ScriptFullPath%, %A_ScriptDir%\Copy-Of--%A_ScriptName%
AWK
version 1
BEGIN{c="BEGIN{c=%c%s%c;printf(c,34,c,34);}";printf(c,34,c,34);}
version 2
BEGIN{c="BEGIN{c=%c%s%c;printf c,34,c,34}";printf c,34,c,34}
Babel
Demonstrating from the commandline:
% bin/babel quine.sp
{ "{ '{ ' << dup [val 0x22 0xffffff00 ] dup <- << << -> << ' ' << << ' }' << } !" { '{ ' << dup [val 0x22 0xffffff00 ] dup <- << << -> << ' ' << << '}' << } ! }%
%
% cat quine.sp
{ "{ '{ ' << dup [val 0x22 0xffffff00 ] dup <- << << -> << ' ' << << ' }' << } !" { '{ ' << dup [val 0x22 0xffffff00 ] dup <- << << -> << ' ' << << '}' << } ! }%
%
Demonstrating in interactive mode:
% bin/babel
babel> { "{ '{ ' << dup [val 0x22 0xffffff00 ] dup <- << << -> << ' ' << << ' }' << } !" { '{ ' << dup [val 0x22 0xffffff00 ] dup <- << << -> << ' ' << << '}' << } ! }
babel> eval
{ "{ '{ ' << dup [val 0x22 0xffffff00 ] dup <- << << -> << ' ' << << ' }' << } !" { '{ ' << dup [val 0x22 0xffffff00 ] dup <- << << -> << ' ' << << '
}' << } !}babel>
babel>
bash
#!/bin/bash
mapfile < $0
printf "%s" "${MAPFILE[@]}"
$ history | tail -n 1 | cut -c 8-
$ echo "$BASH_COMMAND"
_ ()
{
function __ ()
{
true
};
${1} &> /dev/null;
echo "$(declare -f _);_ ${@}"
};_ __
BASIC
ZX Spectrum Basic
For dialects of BASIC that include the LIST
command, Quines are trivial.
10 LIST
For dialects that include the DATA
keyword, it is almost as easy.
READ d$
DO
READ x$
PRINT x$
LOOP UNTIL LEN(x$) < 1
RESTORE
DO
READ x$
PRINT d$; CHR$(34); x$; CHR$(34)
LOOP UNTIL LEN(x$) < 1
END
DATA "DATA "
DATA "READ d$"
DATA "DO"
DATA " READ x$"
DATA " PRINT x$"
DATA "LOOP UNTIL LEN(x$) < 1"
DATA "RESTORE"
DATA "DO"
DATA " READ x$"
DATA " PRINT d$; CHR$(34); x$; CHR$(34)"
DATA "LOOP UNTIL LEN(x$) < 1"
DATA "END"
DATA ""
BASIC256
s$ = "s$ = : print left(s$, 5) + chr(34) + s$ + chr(34) + mid(s$, 5, 66)" : print left(s$, 5) + chr(34) + s$ + chr(34) + mid(s$, 5, 66)
QuickBASIC
A$ = "a!'dbde[39] c34);[97] 'a + c34);[98] 'b';[99] 'c';[100][101] 'e';[91] : PRINT 'CASE c';[93] ']';[33] A$;dCASE ELSE: PRINT MID$(A$, I, 1);dEND SELECTdNEXT Id"
FOR I = 1 TO LEN(A$)
SELECT CASE MID$(A$, I, 1)
CASE CHR$(39): PRINT CHR$(34);
CASE CHR$(97): PRINT "A$ = " + CHR$(34);
CASE CHR$(98): PRINT "FOR I = 1 TO LEN(A$)";
CASE CHR$(99): PRINT "CHR$(";
CASE CHR$(100): PRINT
CASE CHR$(101): PRINT "SELECT CASE MID$(A$, I, 1)";
CASE CHR$(91): PRINT : PRINT "CASE CHR$(";
CASE CHR$(93): PRINT "): PRINT";
CASE CHR$(33): PRINT A$;
CASE ELSE: PRINT MID$(A$, I, 1);
END SELECT
NEXT I
BaCon
?SOURCE$;
or more in line with the task description
a$=SOURCE$:?a$;
- Output:
prompt$ echo -n 'a$=SOURCE$:?a$;' > quine.bac prompt$ bacon -q quine.bac Converting 'quine.bac'... done, 0 lines were processed in 0.005 seconds. Compiling 'quine.bac'... cc -c quine.bac.c cc -o quine quine.bac.o -lbacon -lm Done, program 'quine' ready. prompt$ ./quine a$=SOURCE$:?a$;prompt$
If the source file ends in a newline it will work just as well, the newline will be part of the quine.
And one that is a little less cheaty and a little more meaty:
s$="s$=%c%s%c:?34,s$,34 FORMAT s$":?34,s$,34 FORMAT s$
- Output:
prompt$ ./quine2 s$="s$=%c%s%c:?34,s$,34 FORMAT s$":?34,s$,34 FORMAT s$prompt$
Sinclair ZX81 BASIC
We can of course do it trivially with 10 LIST
; but, if that feels like cheating, we can also PEEK
the source code out of memory and print it.
Works with 1k of RAM.
10 LET L$="10"
20 LET I=VAL "16512"
30 PRINT TAB (VAL "4"-LEN L$);L$;
40 LET I=I+VAL "1"
50 LET C=PEEK I
60 IF C=VAL "118" THEN GOTO VAL "90"
70 PRINT CHR$ C;
80 GOTO VAL "40"
90 PRINT
100 LET L$=STR$ (VAL L$+VAL "10")
110 LET I=I+VAL "4"
120 IF VAL L$<=VAL "120" THEN GOTO VAL "30"
- Output:
Exactly the same.
A couple of notes on how it works:
(1) all the numbers in the source code are dressed up as strings, so that the interpreter does not parse them as numbers and include their floating-point representation in the tokenized source;
(2) when the system lists a program, it allocates four columns for the line number—we replicate this behaviour;
(3) character 118 is the new line character.
Batch File
@type %0
For Windows 2000 and later only:
@type "%~f0"
BBC BASIC
PRINT $(PAGE+22)$(PAGE+21):REM PRINT $(PAGE+22)$(PAGE+21):REM
PRINT $(PAGE+23)$(PAGE+22):REM PRINT $(PAGE+23)$(PAGE+22):REM
BCPL
get "libhdr"
let start() be
$( let x = table
13,10,32,32,32,32,108,101,116,32,110,32,61,32,48,
13,10,32,32,32,32,119,114,105,116,101,115,40,34,103,
101,116,32,42,34,108,105,98,104,100,114,42,34,42,78,
42,78,108,101,116,32,115,116,97,114,116,40,41,32,98,
101,42,78,36,40,32,32,108,101,116,32,120,32,61,32,
116,97,98,108,101,42,78,32,32,32,32,34,41,13,10,
13,10,32,32,32,32,119,104,105,108,101,32,120,33,110,
32,126,61,32,48,32,100,111,13,10,32,32,32,32,36,
40,32,32,119,114,105,116,101,102,40,34,37,78,44,34,
44,120,33,110,41,13,10,32,32,32,32,32,32,32,32,
110,32,58,61,32,110,32,43,32,49,13,10,32,32,32,
32,32,32,32,32,105,102,32,110,32,114,101,109,32,49,
53,32,61,32,48,32,116,104,101,110,32,119,114,105,116,
101,115,40,34,42,78,32,32,32,32,34,41,13,10,32,
32,32,32,36,41,13,10,32,32,32,32,13,10,32,32,
32,32,119,114,105,116,101,115,40,34,48,42,78,34,41,
13,10,32,32,32,32,13,10,32,32,32,32,110,32,58,
61,32,48,13,10,32,32,32,32,119,104,105,108,101,32,
120,33,110,32,126,61,32,48,32,100,111,13,10,32,32,
32,32,36,40,32,32,119,114,99,104,40,120,33,110,41,
13,10,32,32,32,32,32,32,32,32,110,32,58,61,32,
110,32,43,32,49,13,10,32,32,32,32,36,41,13,10,
36,41,13,10,0
let n = 0
writes("get *"libhdr*"*N*Nlet start() be*N$( let x = table*N ")
while x!n ~= 0 do
$( writef("%N,",x!n)
n := n + 1
if n rem 15 = 0 then writes("*N ")
$)
writes("0*N")
n := 0
while x!n ~= 0 do
$( wrch(x!n)
n := n + 1
$)
$)
beeswax
Instruction pointers in beeswax programs can drop values in their own source code (growing the program space, if necessary), or pick up values from everywhere in the source code.
_4~++~+.@1~0@D@1J
or
*4~++~+.@1~0@D@1J
The instruction pointer starts at the left, travels to the right, and at instruction D
the IP drops the current value at the top of its own stack—96, or ASCII value for `
—left of the source code, which changes the program to:
`_4~++~+.@1~0@D@1J
or
`*4~++~+.@1~0@D@1J
respectively.
Arriving at instruction J
(jump) the instruction pointer jumps to the newly dropped instruction, which switches the IP to print out mode, and it outputs every encountered symbol or value to STDOUT until it encounters the next `
or the program ends.
A version that does not modify itself:
`_4~++~+.}1fJ
Befunge
The code space is also the data space of a Befunge program. Programs can be read and modified on the fly. This quine works by reading and printing each character of the source. (This is a implicit loop, since the Befunge codespace wraps around.)
:0g,:66+`#@_1+
Binary Lambda Calculus
As explained at https://tromp.github.io/cl/Binary_lambda_calculus.html#a_quine
000101100100011010000000000001011011110010111100111111011111011010000101100100011010000000000001011011110010111100111111011111011010
A byte oriented version is given by the 18 byte program
16 46 80 05 bc bc fd f6 80 16 46 80 05 bc bc fd f6 80
Bob
c=","; n="\n"; q="\""; s="\\";
v=\[
"c=\",\"; n=\"\\n\"; q=\"\\\"\"; s=\"\\\\\";",
"v=\\[",
"define prtQuote(str) {",
" local j,t,v;",
" stdout.Display(q);",
" for (j=0; j<str.size; j++) {",
" t = str.Substring(j,1);",
" if (t==q) { stdout.Display(s); }",
" if (t==s) { stdout.Display(s); }",
" stdout.Display(t);",
" }",
" stdout.Display(q);",
"}",
"for(i=0; i<2; i++){ stdout.Display(v[i]); stdout.Display(n); }",
"for(i=0; i<v.size-1; i++){ prtQuote(v[i]); stdout.Display(c); stdout.Display(n); }",
"prtQuote(v[v.size-1]); stdout.Display(n);",
"stdout.Display(v[v.size-1]); stdout.Display(n);",
"for(i=2; i<v.size-1; i++){ stdout.Display(v[i]); stdout.Display(n); }",
"];"
];
define prtQuote(str) {
local j,t,v;
stdout.Display(q);
for (j=0; j<str.size; j++) {
t = str.Substring(j,1);
if (t==q) { stdout.Display(s); }
if (t==s) { stdout.Display(s); }
stdout.Display(t);
}
stdout.Display(q);
}
for(i=0; i<2; i++){ stdout.Display(v[i]); stdout.Display(n); }
for(i=0; i<v.size-1; i++){ prtQuote(v[i]); stdout.Display(c); stdout.Display(n); }
prtQuote(v[v.size-1]); stdout.Display(n);
stdout.Display(v[v.size-1]); stdout.Display(n);
for(i=2; i<v.size-1; i++){ stdout.Display(v[i]); stdout.Display(n); }
Bob is a dynamic object-oriented language with syntax similar to C/C++, Java, and JavaScript. Bob was created by David Betz, a former technical editor for DDJ, and the author of XLisp and XScheme, among other languages.
bootBASIC
10 list
BQN
Works in: CBQN
Writes directly to STDOUT.
A BQN spin on the classic APL quine. •Repr
helps with quoting the data string here.
•Out 1⌽∾˜18⥊•Repr"•Out 1⌽∾˜18⥊•Repr"
Bracmat
quine$
Brainf***
->+>+++>>+>++>+>+++>>+>++>>>+>+>+>++>+>>>>+++>+>>++>+>+++>>++>++>>+>>+>++>++>+>>>>+++>+>>>>++>++>>>>+>>++>+>+++>>>++>>++++++>>+>>++>
+>>>>+++>>+++++>>+>+++>>>++>>++>>+>>++>+>+++>>>++>>+++++++++++++>>+>>++>+>+++>+>+++>>>++>>++++>>+>>++>+>>>>+++>>+++++>>>>++>>>>+>+>+
+>>+++>+>>>>+++>+>>>>+++>+>>>>+++>>++>++>+>+++>+>++>++>>>>>>++>+>+++>>>>>+++>>>++>+>+++>+>+>++>>>>>>++>>>+>>>++>+>>>>+++>+>>>+>>++>+
>++++++++++++++++++>>>>+>+>>>+>>++>+>+++>>>++>>++++++++>>+>>++>+>>>>+++>>++++++>>>+>++>>+++>+>+>++>+>+++>>>>>+++>>>+>+>>++>+>+++>>>+
+>>++++++++>>+>>++>+>>>>+++>>++++>>+>+++>>>>>>++>+>+++>>+>++>>>>+>+>++>+>>>>+++>>+++>>>+[[->>+<<]<+]+++++[->+++++++++<]>.[+]>>
[<<+++++++[->+++++++++<]>-.------------------->-[-<.<+>>]<[+]<+>>>]<<<[-[-[-[>>+<++++++[->+++++<]]>++++++++++++++<]>+++<]++++++
[->+++++++<]>+<<<-[->>>++<<<]>[->>.<<]<<]
Burlesque
Using the official interpreter:
blsq ) "I'm a quine."
"I'm a quine."
Every string, every number, every block is a quine.
C
#include <stdio.h>
static char sym[] = "\n\t\\\"";
int main(void) {
const char *code = "#include <stdio.h>%c%cstatic char sym[] = %c%cn%ct%c%c%c%c%c;%c%cint main(void) {%c%cconst char *code = %c%s%c;%c%cprintf(code, sym[0], sym[0], sym[3], sym[2], sym[2], sym[2], sym[2], sym[2], sym[3], sym[3], sym[0], sym[0], sym[0], sym[1], sym[3], code, sym[3], sym[0], sym[1], sym[0], sym[0], sym[1], sym[0], sym[0]);%c%c%creturn 0;%c}%c";
printf(code, sym[0], sym[0], sym[3], sym[2], sym[2], sym[2], sym[2], sym[2], sym[3], sym[3], sym[0], sym[0], sym[0], sym[1], sym[3], code, sym[3], sym[0], sym[1], sym[0], sym[0], sym[1], sym[0], sym[0]);
return 0;
}
Shorter version
#include <stdio.h>
int main(){char*c="#include <stdio.h>%cint main(){char*c=%c%s%c;printf(c,10,34,c,34,10);return 0;}%c";printf(c,10,34,c,34,10);return 0;}
Cheating using __FILE__
On operating systems where a large range of characters can be used, it is possible to create a Quine by putting the following C code in a file with the same name.
#include <stdio.h>
main(void){printf(__FILE__);}
If white space is not permitted in file names, the first line and trailing newline can be omitted.
In practice, it may be necessary to tell the compiler that the language is C, as the filename does not end in .c. Similar Quines are possible in languages such as Python.
C#
class Program { static void Main() { var s = "class Program {{ static void Main() {{ var s = {0}{1}{0}; System.Console.WriteLine(s, (char)34, s); }} }}"; System.Console.WriteLine(s, (char)34, s); } }
C++
#include<cstdio>
int main(){char n[]=R"(#include<cstdio>
int main(){char n[]=R"(%s%c";printf(n,n,41);})";printf(n,n,41);}
C1R
The C1R compiler usually copies C solutions from tasks at Rosetta Code. The Quine task is an exception; it gets special treatment in the C1R compiler.
Quine
C3
import std::io; fn void main() => io::printfn("%sString q = \x60%s\x60;", q, q);String q = `import std::io; fn void main() => io::printfn("%sString q = \x60%s\x60;", q, q);`;
Ceylon
shared void run() {print(let (x = """shared void run() {print(let (x = $) x.replaceFirst("$", "\"\"\"" + x + "\"\"\""));}""") x.replaceFirst("$", "\"\"\"" + x + "\"\"\""));}
Clojure
((fn [x] (list x (list (quote quote) x))) (quote (fn [x] (list x (list (quote quote) x)))))
A shorter but less interesting version:
(#(print (str "(#" % " '" % ")")) '(print (str "(#" % " '" % ")")))
CLU
q="start_up=proc()\n"||
" po:stream:=stream$primary_output()\n"||
" stream$puts(po,\"q=\\\"\")\n"||
" for c:char in string$chars(q) do\n"||
" if c='\\n' then stream$puts(po,\"\\\\n\\\"||\\n\\\"\")\n"||
" elseif c='\\\\' then stream$puts(po,\"\\\\\\\\\")\n"||
" elseif c='\\\"' then stream$puts(po,\"\\\\\\\"\")\n"||
" else stream$putc(po,c)\n"||
" end\n"||
" end\n"||
" stream$puts(po,\"\\\"\\n\"||q)\n"||
"end start_up\n"||
""
start_up=proc()
po:stream:=stream$primary_output()
stream$puts(po,"q=\"")
for c:char in string$chars(q) do
if c='\n' then stream$puts(po,"\\n\"||\n\"")
elseif c='\\' then stream$puts(po,"\\\\")
elseif c='\"' then stream$puts(po,"\\\"")
else stream$putc(po,c)
end
end
stream$puts(po,"\"\n"||q)
end start_up
COBOL
Here is one that works with GnuCOBOL, December 2015, by Simon Sobisch, tweaked by Bill Woodger.
One line, 150 characters. Some warnings regarding relaxed syntax assumptions when compiled with
cobc -x -free -frelax quine.cob
linkage section. 78 c value "display 'linkage section. 78 c value ' x'22' c x'222e20' c.". display 'linkage section. 78 c value ' x'22' c x'222e20' c.
The following two quines were in a gray past (around 2004?) posted to the (currently inaccessible) language forum of the mvsHelp Boards
IDENTIFICATION DIVISION.
PROGRAM-ID. GRICE.
ENVIRONMENT DIVISION.
CONFIGURATION SECTION.
SPECIAL-NAMES.
SYMBOLIC CHARACTERS FULL-STOP IS 76.
INPUT-OUTPUT SECTION.
FILE-CONTROL.
SELECT OUTPUT-FILE ASSIGN TO OUTPUT1.
DATA DIVISION.
FILE SECTION.
FD OUTPUT-FILE
RECORDING MODE F
LABEL RECORDS OMITTED.
01 OUTPUT-RECORD PIC X(80).
WORKING-STORAGE SECTION.
01 SUB-X PIC S9(4) COMP.
01 SOURCE-FACSIMILE-AREA.
02 SOURCE-FACSIMILE-DATA.
03 FILLER PIC X(40) VALUE
" IDENTIFICATION DIVISION. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" PROGRAM-ID. GRICE. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" ENVIRONMENT DIVISION. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" CONFIGURATION SECTION. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" SPECIAL-NAMES. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" SYMBOLIC CHARACTERS FULL-STOP".
03 FILLER PIC X(40) VALUE
" IS 76. ".
03 FILLER PIC X(40) VALUE
" INPUT-OUTPUT SECTION. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" FILE-CONTROL. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" SELECT OUTPUT-FILE ASSIGN TO ".
03 FILLER PIC X(40) VALUE
"OUTPUT1. ".
03 FILLER PIC X(40) VALUE
" DATA DIVISION. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" FILE SECTION. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" FD OUTPUT-FILE ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" RECORDING MODE F ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" LABEL RECORDS OMITTED. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" 01 OUTPUT-RECORD ".
03 FILLER PIC X(40) VALUE
" PIC X(80). ".
03 FILLER PIC X(40) VALUE
" WORKING-STORAGE SECTION. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" 01 SUB-X ".
03 FILLER PIC X(40) VALUE
" PIC S9(4) COMP. ".
03 FILLER PIC X(40) VALUE
" 01 SOURCE-FACSIMILE-AREA. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" 02 SOURCE-FACSIMILE-DATA. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" 03 FILLER ".
03 FILLER PIC X(40) VALUE
" PIC X(40) VALUE ".
03 FILLER PIC X(40) VALUE
" 02 SOURCE-FACSIMILE-TABLE RE".
03 FILLER PIC X(40) VALUE
"DEFINES ".
03 FILLER PIC X(40) VALUE
" SOURCE-FACSIMILE-DATA".
03 FILLER PIC X(40) VALUE
". ".
03 FILLER PIC X(40) VALUE
" 03 SOURCE-FACSIMILE OCCU".
03 FILLER PIC X(40) VALUE
"RS 68. ".
03 FILLER PIC X(40) VALUE
" 04 SOURCE-FACSIMILE-".
03 FILLER PIC X(40) VALUE
"ONE PIC X(40). ".
03 FILLER PIC X(40) VALUE
" 04 SOURCE-FACSIMILE-".
03 FILLER PIC X(40) VALUE
"TWO PIC X(40). ".
03 FILLER PIC X(40) VALUE
" 01 FILLER-IMAGE. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" 02 FILLER ".
03 FILLER PIC X(40) VALUE
" PIC X(15) VALUE SPACES. ".
03 FILLER PIC X(40) VALUE
" 02 FILLER ".
03 FILLER PIC X(40) VALUE
" PIC X VALUE QUOTE. ".
03 FILLER PIC X(40) VALUE
" 02 FILLER-DATA ".
03 FILLER PIC X(40) VALUE
" PIC X(40). ".
03 FILLER PIC X(40) VALUE
" 02 FILLER ".
03 FILLER PIC X(40) VALUE
" PIC X VALUE QUOTE. ".
03 FILLER PIC X(40) VALUE
" 02 FILLER ".
03 FILLER PIC X(40) VALUE
" PIC X VALUE FULL-STOP. ".
03 FILLER PIC X(40) VALUE
" 02 FILLER ".
03 FILLER PIC X(40) VALUE
" PIC X(22) VALUE SPACES. ".
03 FILLER PIC X(40) VALUE
" PROCEDURE DIVISION. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" MAIN-LINE SECTION. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" ML-1. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" OPEN OUTPUT OUTPUT-FILE. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" MOVE 1 TO SUB-X. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" ML-2. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" MOVE SOURCE-FACSIMILE (SUB-X)".
03 FILLER PIC X(40) VALUE
" TO OUTPUT-RECORD. ".
03 FILLER PIC X(40) VALUE
" WRITE OUTPUT-RECORD. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" IF SUB-X < 19 ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" ADD 1 TO SUB-X ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" GO TO ML-2. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" MOVE 1 TO SUB-X. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" ML-3. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" MOVE SOURCE-FACSIMILE (20) TO".
03 FILLER PIC X(40) VALUE
" OUTPUT-RECORD. ".
03 FILLER PIC X(40) VALUE
" WRITE OUTPUT-RECORD. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" MOVE SOURCE-FACSIMILE-ONE (SU".
03 FILLER PIC X(40) VALUE
"B-X) TO FILLER-DATA. ".
03 FILLER PIC X(40) VALUE
" MOVE FILLER-IMAGE TO OUTPUT-R".
03 FILLER PIC X(40) VALUE
"ECORD. ".
03 FILLER PIC X(40) VALUE
" WRITE OUTPUT-RECORD. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" MOVE SOURCE-FACSIMILE (20) TO".
03 FILLER PIC X(40) VALUE
" OUTPUT-RECORD. ".
03 FILLER PIC X(40) VALUE
" WRITE OUTPUT-RECORD. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" MOVE SOURCE-FACSIMILE-TWO (SU".
03 FILLER PIC X(40) VALUE
"B-X) TO FILLER-DATA. ".
03 FILLER PIC X(40) VALUE
" MOVE FILLER-IMAGE TO OUTPUT-R".
03 FILLER PIC X(40) VALUE
"ECORD. ".
03 FILLER PIC X(40) VALUE
" WRITE OUTPUT-RECORD. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" IF SUB-X < 68 ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" ADD 1 TO SUB-X ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" GO TO ML-3. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" MOVE 21 TO SUB-X. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" ML-4. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" MOVE SOURCE-FACSIMILE (SUB-X)".
03 FILLER PIC X(40) VALUE
" TO OUTPUT-RECORD. ".
03 FILLER PIC X(40) VALUE
" WRITE OUTPUT-RECORD. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" IF SUB-X < 68 ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" ADD 1 TO SUB-X ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" GO TO ML-4. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" ML-99. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" CLOSE OUTPUT-FILE. ".
03 FILLER PIC X(40) VALUE
" ".
03 FILLER PIC X(40) VALUE
" STOP RUN. ".
03 FILLER PIC X(40) VALUE
" ".
02 SOURCE-FACSIMILE-TABLE REDEFINES
SOURCE-FACSIMILE-DATA.
03 SOURCE-FACSIMILE OCCURS 68.
04 SOURCE-FACSIMILE-ONE PIC X(40).
04 SOURCE-FACSIMILE-TWO PIC X(40).
01 FILLER-IMAGE.
02 FILLER PIC X(15) VALUE SPACES.
02 FILLER PIC X VALUE QUOTE.
02 FILLER-DATA PIC X(40).
02 FILLER PIC X VALUE QUOTE.
02 FILLER PIC X VALUE FULL-STOP.
02 FILLER PIC X(22) VALUE SPACES.
PROCEDURE DIVISION.
MAIN-LINE SECTION.
ML-1.
OPEN OUTPUT OUTPUT-FILE.
MOVE 1 TO SUB-X.
ML-2.
MOVE SOURCE-FACSIMILE (SUB-X) TO OUTPUT-RECORD.
WRITE OUTPUT-RECORD.
IF SUB-X < 19
ADD 1 TO SUB-X
GO TO ML-2.
MOVE 1 TO SUB-X.
ML-3.
MOVE SOURCE-FACSIMILE (20) TO OUTPUT-RECORD.
WRITE OUTPUT-RECORD.
MOVE SOURCE-FACSIMILE-ONE (SUB-X) TO FILLER-DATA.
MOVE FILLER-IMAGE TO OUTPUT-RECORD.
WRITE OUTPUT-RECORD.
MOVE SOURCE-FACSIMILE (20) TO OUTPUT-RECORD.
WRITE OUTPUT-RECORD.
MOVE SOURCE-FACSIMILE-TWO (SUB-X) TO FILLER-DATA.
MOVE FILLER-IMAGE TO OUTPUT-RECORD.
WRITE OUTPUT-RECORD.
IF SUB-X < 68
ADD 1 TO SUB-X
GO TO ML-3.
MOVE 21 TO SUB-X.
ML-4.
MOVE SOURCE-FACSIMILE (SUB-X) TO OUTPUT-RECORD.
WRITE OUTPUT-RECORD.
IF SUB-X < 68
ADD 1 TO SUB-X
GO TO ML-4.
ML-99.
CLOSE OUTPUT-FILE.
STOP RUN.
ID DIVISION.
PROGRAM-ID. QUINE.
DATA DIVISION.
WORKING-STORAGE SECTION.
1 X PIC S9(4) COMP.
1 A. 2 B.
3 PIC X(40) VALUE " ID DIVISION. ".
3 PIC X(40) VALUE " ".
3 PIC X(40) VALUE " PROGRAM-ID. QUINE. ".
3 PIC X(40) VALUE " ".
3 PIC X(40) VALUE " DATA DIVISION. ".
3 PIC X(40) VALUE " ".
3 PIC X(40) VALUE " WORKING-STORAGE SECTION. ".
3 PIC X(40) VALUE " ".
3 PIC X(40) VALUE " 1 X PIC S9(4) COMP. ".
3 PIC X(40) VALUE " ".
3 PIC X(40) VALUE " 1 A. 2 B. ".
3 PIC X(40) VALUE " ".
3 PIC X(40) VALUE " 2 T REDEFINES B. 3 TE OCCURS 16. ".
3 PIC X(40) VALUE "4 T1 PIC X(40). 4 T2 PIC X(40). ".
3 PIC X(40) VALUE " 1 F. 2 PIC X(25) VALUE ".
3 PIC X(40) VALUE "' 3 PIC X(40) VALUE '. ".
3 PIC X(40) VALUE " 2 PIC X VALUE QUOTE. 2 FF PIC X(4".
3 PIC X(40) VALUE "0). 2 PIC X VALUE QUOTE. ".
3 PIC X(40) VALUE " 2 PIC X VALUE '.'. ".
3 PIC X(40) VALUE " ".
3 PIC X(40) VALUE " PROCEDURE DIVISION. ".
3 PIC X(40) VALUE " ".
3 PIC X(40) VALUE " PERFORM VARYING X FROM 1 BY 1".
3 PIC X(40) VALUE " UNTIL X > 6 DISPLAY TE (X) ".
3 PIC X(40) VALUE " END-PERFORM PERFORM VARYING X".
3 PIC X(40) VALUE " FROM 1 BY 1 UNTIL X > 16 ".
3 PIC X(40) VALUE " MOVE T1 (X) TO FF DISPLAY F M".
3 PIC X(40) VALUE "OVE T2 (X) TO FF DISPLAY F ".
3 PIC X(40) VALUE " END-PERFORM PERFORM VARYING X".
3 PIC X(40) VALUE " FROM 7 BY 1 UNTIL X > 16 ".
3 PIC X(40) VALUE " DISPLAY TE (X) END-PERFORM ST".
3 PIC X(40) VALUE "OP RUN. ".
2 T REDEFINES B. 3 TE OCCURS 16. 4 T1 PIC X(40). 4 T2 PIC X(40).
1 F. 2 PIC X(25) VALUE ' 3 PIC X(40) VALUE '.
2 PIC X VALUE QUOTE. 2 FF PIC X(40). 2 PIC X VALUE QUOTE.
2 PIC X VALUE '.'.
PROCEDURE DIVISION.
PERFORM VARYING X FROM 1 BY 1 UNTIL X > 6 DISPLAY TE (X)
END-PERFORM PERFORM VARYING X FROM 1 BY 1 UNTIL X > 16
MOVE T1 (X) TO FF DISPLAY F MOVE T2 (X) TO FF DISPLAY F
END-PERFORM PERFORM VARYING X FROM 7 BY 1 UNTIL X > 16
DISPLAY TE (X) END-PERFORM STOP RUN.
An even smaller one could be found of the site of Tom Dawes-Gamble, but is reproduced below, as the original seems to have vanished:
Author. Tom Dawes-Gamble. (c) 2000
01 src-lines pic x(768) value
" Author. Tom Dawes-Gamble. (c) 2000
-"01 src-lines pic x(768) value
-"01 sl redefines src-lines pic x(64) occurs 12 indexed by i.
-" Perform varying i from 1 by 1 until i > 2
-" Display ' ' sl(i).
-" Display ' ' quote sl(1).
-" Perform varying i from 2 by 1 until i > 11
-" Display ' ' '-' quote sl(i).
-" Display ' ' '-' quote ' Stop run.' quote '.'.
-" Perform varying i from 3 by 1 until i > 12
-" Display ' ' sl(i).
-" Stop run.".
01 sl redefines src-lines pic x(64) occurs 12 indexed by i.
Perform varying i from 1 by 1 until i > 2
Display ' ' sl(i).
Display ' ' quote sl(1).
Perform varying i from 2 by 1 until i > 11
Display ' ' '-' quote sl(i).
Display ' ' '-' quote ' Stop run.' quote '.'.
Perform varying i from 3 by 1 until i > 12
Display ' ' sl(i).
Stop run.
CoffeeScript
s="s=#&# ;alert s.replace(/&/,s).replace /#(?=[^&;'(]|';;$)/g, '#';;" ;alert s.replace(/&/,s).replace /#(?=[^&;'(]|';;$)/g, '"';;
Commodore BASIC
A rather long and unwieldy (although nicely formatted) BASIC quine that doesn't use the 10 LIST cheat. Works on the PET, VIC-20, C-64, C-128, C-16 and Plus/4, CBM-II, and CBM-5x0 series, and probably several non-Commodore BASICs as well, especially those based on Microsoft BASIC.
10 DATA 49,54,48,32,78,61,51,51,48,13,49,55,48,32,68,73,77,32,65,40,78,41,13
20 DATA 49,56,48,32,70,79,82,32,73,61,48,32,84,79,32,78,13,49,57,48,32,58,32
30 DATA 82,69,65,68,32,65,40,73,41,13,50,48,48,32,78,69,88,84,32,73,13,50,49
40 DATA 48,32,70,79,82,32,73,61,48,32,84,79,32,49,52,32,13,50,50,48,32,58,32
50 DATA 80,82,73,78,84,32,77,73,68,36,40,83,84,82,36,40,40,73,43,49,41,42,49
60 DATA 48,41,44,50,41,59,34,32,68,65,84,65,32,34,59,77,73,68,36,40,83,84,82
70 DATA 36,40,65,40,73,42,50,51,41,41,44,50,41,59,13,50,51,48,32,58,32,70,79
80 DATA 82,32,74,61,49,32,84,79,32,50,50,13,50,52,48,32,58,32,32,32,75,61,73
90 DATA 42,50,51,43,74,13,50,53,48,32,58,32,32,32,73,70,32,75,32,60,61,32,78
100 DATA 32,84,72,69,78,32,80,82,73,78,84,32,34,44,34,59,77,73,68,36,40,83,84
110 DATA 82,36,40,65,40,75,41,41,44,50,41,59,13,50,54,48,32,58,32,78,69,88,84
120 DATA 32,74,13,50,55,48,32,58,32,80,82,73,78,84,13,50,56,48,32,78,69,88,84
130 DATA 32,73,13,50,57,48,32,70,79,82,32,73,61,48,32,84,79,32,78,13,51,48,48
140 DATA 32,58,32,80,82,73,78,84,32,67,72,82,36,40,65,40,73,41,41,59,13,51,49
150 DATA 48,32,78,69,88,84,32,73,13
160 N=330
170 DIM A(N)
180 FOR I=0 TO N
190 : READ A(I)
200 NEXT I
210 FOR I=0 TO 14
220 : PRINT MID$(STR$((I+1)*10),2);" DATA ";MID$(STR$(A(I*23)),2);
230 : FOR J=1 TO 22
240 : K=I*23+J
250 : IF K <= N THEN PRINT ",";MID$(STR$(A(K)),2);
260 : NEXT J
270 : PRINT
280 NEXT I
290 FOR I=0 TO N
300 : PRINT CHR$(A(I));
310 NEXT I
Common Lisp
There are many simple ways to write a quine in Common Lisp, since source can be quoted and manipulated; this one defines an anonymous function, which is applied to its own source, which writes out that application of itself to its source. Note that Common Lisp by default does not distinguish cases.
((lambda (s) (print (list s (list 'quote s))))
'(lambda (s) (print (list s (list 'quote s)))))
This one does the same thing using quasiquote (template) syntax; in some implementations it may not print nicely (but will still work):
((lambda (s) (print `(,s ',s))) '(lambda (s) (print `(,s ',s))))
or another version:
((lambda (x) `(,x ',x)) '(lambda (x) `(,x ',x)))
This program's source contains an explicit reference to itself, which it prints in a manner preserving that reference:
#1=(write '#1# :circle t)
or another version (the former version cause looping in SBCL 1.0.56):
#1=(progn (setq *print-circle* t) (write '#1#))
This is an example using format and explicit referencing:
(format t #1='"(format t #1='~s #1#)" #1#)
An example using REPL variables:
(write -)
Cowgol
include "cowgol.coh";
var i: uint8 := 0;
var c: uint8[] := {
118,97,114,32,100,32,58,61,32,38,99,32,97,115,32,91,117,105,110,116,
56,93,59,10,112,114,105,110,116,40,34,105,110,99,108,117,100,101,32,92,
34,99,111,119,103,111,108,46,99,111,104,92,34,59,92,110,34,41,59,10,
112,114,105,110,116,40,34,118,97,114,32,105,58,32,117,105,110,116,56,32,
58,61,32,48,59,92,110,34,41,59,10,112,114,105,110,116,40,34,118,97,
114,32,99,58,32,117,105,110,116,56,91,93,32,58,61,32,123,92,110,34,
41,59,10,108,111,111,112,32,10,32,32,32,32,112,114,105,110,116,95,105,
56,40,91,100,93,41,59,10,32,32,32,32,105,102,32,91,100,93,61,61,
48,32,116,104,101,110,32,98,114,101,97,107,59,32,101,110,100,32,105,102,
59,10,32,32,32,32,100,32,58,61,32,64,110,101,120,116,32,100,59,10,
32,32,32,32,112,114,105,110,116,95,99,104,97,114,40,39,44,39,41,59,
10,32,32,32,32,105,32,58,61,32,105,32,43,32,49,59,10,32,32,32,
32,105,102,32,105,61,61,50,48,32,116,104,101,110,32,10,32,32,32,32,
32,32,32,32,112,114,105,110,116,95,110,108,40,41,59,32,10,32,32,32,
32,32,32,32,32,105,32,58,61,32,48,59,10,32,32,32,32,101,110,100,
32,105,102,59,10,101,110,100,32,108,111,111,112,59,10,112,114,105,110,116,
40,34,92,110,125,59,92,110,34,41,59,10,112,114,105,110,116,40,38,99,
32,97,115,32,91,117,105,110,116,56,93,41,59,0
};
var d := &c as [uint8];
print("include \"cowgol.coh\";\n");
print("var i: uint8 := 0;\n");
print("var c: uint8[] := {\n");
loop
print_i8([d]);
if [d]==0 then break; end if;
d := @next d;
print_char(',');
i := i + 1;
if i==20 then
print_nl();
i := 0;
end if;
end loop;
print("\n};\n");
print(&c as [uint8]);
Crystal
".tap{|s|print s.inspect,s}".tap{|s|print s.inspect,s}
tap is an Object method which passes its invocant to the provided block.
D
This Quine outputs its own source both during compiling and running.
const auto s=`const auto q="const auto s=\x60"~s~"\x60;
mixin(s);";import std.stdio;void main(){writefln(q);pragma(msg,q);}`;
mixin(s);
NB: last line should be CRLF to match pragma's newline output behaviour.
Dao
Dao's BNF-like meta-programming macro supports quoting expressions as strings, which allow writing a quine as the following:
syntax{Q $EXP}as{io.writef('syntax{Q $EXP}as{%s}Q %s',\'$EXP\',\'$EXP\')}Q io.writef('syntax{Q $EXP}as{%s}Q %s',\'$EXP\',\'$EXP\')
Dart
main()=>(s){print('$s(r\x22$s\x22);');}(r"main()=>(s){print('$s(r\x22$s\x22);');}");
dc
[91PP93P[dx]P]dx
Déjà Vu
"!print !. dup"
!print !. dup
Draco
*char q=
"proc main() void:\r\n"
" [128]char l;\r\n"
" char ch;\r\n"
" channel input text qc, lc;\r\n"
" open(qc, q);\r\n"
" writeln(\"*char q=\");\r\n"
" while readln(qc; &l[0]) do\r\n"
" write('\"');\r\n"
" open(lc, &l[0]);\r\n"
" while read(lc; ch) do\r\n"
" if ch='\"' or ch='\\\\' then write('\\\\') fi;\r\n"
" write(ch)\r\n"
" od;\r\n"
" close(lc);\r\n"
" writeln(\"\\\\r\\\\n\\\"\")\r\n"
" od;\r\n"
" close(qc);\r\n"
" writeln(';');\r\n"
" writeln(q)\r\n"
"corp\r\n"
;
proc main() void:
[128]char l;
char ch;
channel input text qc, lc;
open(qc, q);
writeln("*char q=");
while readln(qc; &l[0]) do
write('"');
open(lc, &l[0]);
while read(lc; ch) do
if ch='"' or ch='\\' then write('\\') fi;
write(ch)
od;
close(lc);
writeln("\\r\\n\"")
od;
close(qc);
writeln(';');
writeln(q)
corp
E
" =~ x; println(E.toQuote(x),x)" =~ x; println(E.toQuote(x),x)
EasyLang
S$ = "print strchar 83 & strchar 36 & strchar 32 & strchar 61 & strchar 32 & strchar 34 & S$ & strchar 34 & strchar 10 & S$"
print strchar 83 & strchar 36 & strchar 32 & strchar 61 & strchar 32 & strchar 34 & S$ & strchar 34 & strchar 10 & S$
Ecstasy
module test {
@Inject Console console;
void run() {
console.print($./test.x);
}
}
- Output:
module test { @Inject Console console; void run() { console.print($./test.x); } }
Ed
This is certainly a cheating, but save this file as quine.ed and run the script, effectively printing the file contents.
r quine.ed
,p
Q
Elixir
a = <<"a = ~p~n:io.fwrite(a,[a])~n">>
:io.fwrite(a,[a])
Erlang
-module(quine).
-export([do/0]).
do() -> Txt=txt(), io:format("~s~ntxt() ->~n~w.~n",[Txt,Txt]), halt().
txt() ->
[45,109,111,100,117,108,101,40,113,117,105,110,101,41,46,10,45,101,120,112,111,114,116,40,91,100,111,47,48,93,41,46,10,10,100,111,40,41,32,45,62,32,84,120,116,61,116,120,116,40,41,44,32,105,111,58,102,111,114,109,97,116,40,34,126,115,126,110,116,120,116,40,41,32,45,62,126,110,126,119,46,126,110,34,44,91,84,120,116,44,84,120,116,93,41,44,32,104,97,108,116,40,41,46].
ERRE
PROGRAM QUINE
BEGIN
READ(D$,Y$)
LOOP
READ(X$)
EXIT IF LEN(X$)<1
PRINT(X$)
END LOOP
RESTORE
LOOP
READ(X$)
EXIT IF LEN(X$)<1
PRINT(D$;CHR$(34);X$;CHR$(34);CHR$(41))
END LOOP
PRINT(D$;CHR$(34);CHR$(34);CHR$(41))
PRINT(Y$)
DATA("DATA(")
DATA("END PROGRAM")
DATA("PROGRAM QUINE")
DATA("BEGIN")
DATA("READ(D$,Y$)")
DATA("LOOP")
DATA(" READ(X$)")
DATA(" EXIT IF LEN(X$)<1")
DATA(" PRINT(X$)")
DATA("END LOOP")
DATA("RESTORE")
DATA("LOOP")
DATA(" READ(X$)")
DATA(" EXIT IF LEN(X$)<1")
DATA(" PRINT(D$;CHR$(34);X$;CHR$(34);CHR$(41))")
DATA("END LOOP")
DATA("PRINT(D$;CHR$(34);CHR$(34);CHR$(41))")
DATA("PRINT(Y$)")
DATA("")
END PROGRAM
Euphoria
constant p="constant p=%s%s%s printf(1,p,{34,p,34})" printf(1,p,{34,p,34})
F#
Using .NET string formatting
let s = "let s = {0}{1}{0} in System.Console.WriteLine(s, char 34, s);;" in System.Console.WriteLine(s, char 34, s);;
Using Printf library
(fun s c -> printf s c s.Value c) "(fun s c -> printf s c s.Value c) %c%s%c <| char 34;;" <| char 34;;
Factor
With printf:
"%s [ 34 1string dup surround ] keep printf" [ 34 1string dup surround ] keep printf
With prettyprinter:
"[ pprint ] [ write ] bi"[ pprint ] [ write ] bi
FALSE
El código es de Mathew Hendry (m.hendry@dial.pipex.com)
["'[,34,$!34,'],!"]'[,34,$!34,'],!
Fish
All the zeros and +'s on the first line are just for aesthetic purposes. Only two zeros are needed, although the v at the end must line up.
00000000000000000000++++++++++++++++++ v
2[$:{:@]$g:0=?v >o:4a*=?!v~1+:3=?;0ao>
>~" "^ >1+ ^
Forth
A large number of quine methods are listed here, the simplest of which is:
SOURCE TYPE
Fortran
F90+
Fortran allows the start of a text literal to be marked by either an apostrophe or a double quote and the end by the corresponding character. Doubling is used to signify that the delimiter appears within a literal.
character*46::s='("character*46::s=",3a,";print s,39,s,39;end")';print s,39,s,39;end
- Output:
character*46::s='("character*46::s=",3a,";print s,39,s,39;end")';print s,39,s,39;end
In ASCII, character 39 is an apostrophe. When run, the last "print" is preceded by three spaces after the semicolon that do not appear in the source. This wouldn't worry a Fortran compiler, because spaces are ignored outside text literals. More troublesome is that the first letter of the output appears in column one, and, being the letter "c", that marks a comment. This is why the text lighlighting has rendered the source text in italic. Later Fortran compilers may disregard this comment formalism in favour of the now standard in-line comment starter of an exclamation mark, and for them, the source would not be a comment.
Older Fortran
This reverts to fixed-format source form, relying on the format code / to signify a new line so that ASCII control characters need not be represented. Code Tn means "tab" to column n - no ASCII tab characters are involved. And difficulty with quoted strings is avoided by using the Hollerith form, nH, signifying that n characters follow the H as a text literal.
WRITE(6,100)
STOP
100 FORMAT(6X,12HWRITE(6,100)/6X,4HSTOP/
.42H 100 FORMAT(6X,12HWRITE(6,100)/6X,4HSTOP/ ,2(/5X,67H.
.42H 100 FORMAT(6X,12HWRITE(6,100)/6X,4HSTOP/ ,2(/5X,67H.
.)/T48,2H)/T1,5X2(21H.)/T48,2H)/T1,5X2(21H)/
.T62,10H)/6X3HEND)T1,5X2(28H.T62,10H)/6X3HEND)T1,5X2(28H)/6X3HEND)
END
And indeed, exactly that opaque gibberish is written, with leading spaces to column seven and full stops in column six to mark a continuation. This was checked by UltraCompare, not just by eye!
Nostalgia note
I remember when this challenge came up, way back in 1966 --- FORTRAN was the game in town, and there existed a feature (well, really, a bug) that allowed an IBM FORTRAN program under IBM's OS/PCP/MFT/MVT [no HASP] to REWIND the default input stream (which were punched cards, and REWIND of course, was only intended for reel-to-reel tapes), which essentially then allowed the program to read it's own source, and then it was a simple matter to PRINT it.
The current CONTROL DATA FORTRAN had a feature that allowed the FORTRAN programmer to WRITE and then re-read I/O (the feature could've been called the REREAD statement, the WRITE may have been to device 0). If one didn't WRITE, just REREAD, the file stream then pointed to the source just read, thus allowing access to the FORTRAN program's source.
This challenge was extended to other languages, the concept was to print the actual source of the program, not use a recursive (or some derivative) method. There were some very clever (and obtuse and/or obscure) methods presented. A lot of operating systems, being in their infancy, had loopholes that allowed programmers to access files in their own job stream.
Another challenge at that time was to write a multi-language program (with NO changes) that would compile (or assemble) in various languages (without errors, of course) and produce the identical output. There were some very creative uses of "comments". --- Gerard Schildberger.
Free Pascal
const s=';begin writeln(#99#111#110#115#116#32#115#61#39,s,#39,s);readln;end.';begin writeln(#99#111#110#115#116#32#115#61#39,s,#39,s);readln;end.
FreeBASIC
Código 1:
#Define P(X) Print X: Print "P(" & #X & ")"
P("#Define P(X) Print X: Print ""P("" & #X & "")""")
Código 2:
Dim As String s = "Dim As String s = : Print Left(s, 18) + Chr(34) + s + Chr(34) + Mid(s, 18)" : Print Left(s, 18) + Chr(34) + s + Chr(34) + Mid(s, 18)
Frink
This is not a particularly clever nor concise quine, but it is indeed a quine.
d="633d636861725b33345d3b653d643b7072696e745b22643d2463246424635c6e222b28653d7e25732f285b612d7a302d395d7b327d292f636861725b7061727365496e745b24312c31365d5d2f6567295d"
c=char[34];e=d;print["d=$c$d$c\n"+(e=~%s/([a-z0-9]{2})/char[parseInt[$1,16]]/eg)]
A more concise quine is:
1
The most concise quine in Frink, though, is the empty string.
Fōrmulæ
Fōrmulæ programs are not textual, visualization/edition of programs is done showing/manipulating structures but not text. Moreover, there can be multiple visual representations of the same program. Even though it is possible to have textual representation —i.e. XML, JSON— they are intended for storage and transfer purposes more than visualization and edition.
Programs in Fōrmulæ are created/edited online in its website.
In this page you can see and run the program(s) related to this task and their results. You can also change either the programs or the parameters they are called with, for experimentation, but remember that these programs were created with the main purpose of showing a clear solution of the task, and they generally lack any kind of validation.
Solution
Preamble. Symbolic computation
Symbolic computation works different than traditional one. In symbolic computation, the program becomes gradually in its output, by the application of rewriting rules.
Example 1. The simplest program
The simplest program is a Null expression. Please notice that it is not an empty program (which is disallowed). It is just a one expression program: the Null expression, which has no rewriting rules.
Example 2. A program with non-reducible expressions
According to symbolic computation, if a program contains only non-reducible expressions (expression with no rewriting rules), then it will no be transformed to anything else, and it will be its own output.
Furor
A very short solution, using some special features of Furor:
"#s sto selfstring QUOTE @selfstring dup print QUOTE NL printnl end { „selfstring” }"
#s sto selfstring QUOTE @selfstring dup print QUOTE NL printnl end { „selfstring” }
And behold, here is a more complex but "traditional" solution of this famous task, solved by 3 loops:
#g §vége §eleje - tokensize / sto maxlines
#s
7 {| {} §eleje[] printnl |}
@maxlines {| {} §eleje[] QUOTE print QUOTE NL |}
7 @maxlines {|| {} §eleje[] printnl |}
end
eleje:
"#g §vége §eleje - tokensize / sto maxlines"
"#s"
"7 {| {} §eleje[] printnl |}"
" @maxlines {| {} §eleje[] QUOTE print QUOTE NL |}"
"7 @maxlines {|| {} §eleje[] printnl |}"
"end"
"eleje:"
"vége:"
"{ „selfstring” }"
"{ „maxlines” }"
vége:
{ „selfstring” }
{ „maxlines” }
Peri
###sysinclude standard.uh
#g §vége §eleje - sto maxlines
#s
8 {{ {{}} §eleje[] printnl }}
@maxlines {{ {{}} §eleje[] QUOTE print QUOTE NL }}
8 @maxlines {{ , {{}} §eleje[] printnl }}
end
eleje:
"###sysinclude standard.uh"
"#g §vége §eleje - sto maxlines"
"#s"
"8 {{ {{}} §eleje[] printnl }}"
" @maxlines {{ {{}} §eleje[] QUOTE print QUOTE NL }}"
"8 @maxlines {{ , {{}} §eleje[] printnl }}"
"end"
"eleje:"
"vége:"
"{ „selfstring” }"
"{ „maxlines” }"
vége:
{ „selfstring” }
{ „maxlines” }
FutureBasic
This quine depends on BASIC syntax which, although still compilable with FB, is long obsolete.
window 1,,(0,0,350,430)
Str255 d, x
read d
do
read x
print x
until len$(x) == 0
restore
do
read x
print d; chr$(34); x; chr$(34)
until len$(x) == 0
HandleEvents
data "data "
data "window 1,,(0,0,350,430)"
data "Str255 d, x"
data "read d"
data "do"
data " read x"
data " print x"
data "until len$(x) == 0"
data "restore"
data "do"
data " read x"
data " print d; chr$(34); x; chr$(34)"
data "until len$(x) == 0"
data "HandleEvents"
data ""
- Output:
Ditto, of course.
Gabuzomeu
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:_ HEADBU,a HEADZO,b JUMPc :a LIFTBUJUMP_ :b LIFTZOJUMP_ :c CALCMEU,#BUGAGAMEUDUMPMEUCALCMEU,#BUGAGABUDUMPMEUCALCMEU,#BUGAMEUGADUMPMEUCALCMEU,#BUGAGAMEUDUMPMEUCALCMEU,#BUGABUMEUDUMPMEUCALCMEU,#BUGAGABUDUMPMEUCALCMEU,#ZOMEUGADUMPMEUBASE#BUGADUMPGABASE#BUGAGAGAGATAILBU,d TAILZO,e JUMPf :d CALCMEU,#BUGAGAZODUMPMEUCALCMEU,#BUGAZOBUDUMPMEUCALCMEU,#BUBUGAZODUMPMEUCALCMEU,#BUGABUGADUMPMEUCALCMEU,#BUGAGAZODUMPMEUCALCMEU,#BUBUBUBUDUMPMEUCALCMEU,#BUGAMEUGADUMPMEUCALCMEU,#BUGAZOBUDUMPMEUCALCMEU,#BUGABUZODUMPMEUCALCMEU,#BUBUBUGADUMPMEUCALCMEU,#BUGAGAZODUMPMEUCALCMEU,#BUBUBUBUDUMPMEULIFTBUJUMPc :e CALCMEU,#BUGAGAZODUMPMEUCALCMEU,#BUGAZOBUDUMPMEUCALCMEU,#BUBUGAZODUMPMEUCALCMEU,#BUGABUGADUMPMEUCALCMEU,#BUBUZOZODUMPMEUCALCMEU,#BUGAMEUMEUDUMPMEUCALCMEU,#BUGAMEUGADUMPMEUCALCMEU,#BUGAZOBUDUMPMEUCALCMEU,#BUGABUZODUMPMEUCALCMEU,#BUBUBUGADUMPMEUCALCMEU,#BUBUZOZODUMPMEUCALCMEU,#BUGAMEUMEUDUMPMEULIFTZOJUMPc :f HEADBU,g HEADZO,h JUMPi :g LIFTBUJUMPf :h LIFTZOJUMPf :i DUMPGATAILBU,j TAILZO,k JUMPl :j LIFTBUJUMPi :k LIFTZOJUMPi :l
Gambas
You can run this from shell with "gbs3" of the Gambas3 project (BASIC dialect).
dim s as string="dim s as string=&1&2&3&4print subst(s,chr(34),s,chr(34),chr(10))"
print subst(s,chr(34),s,chr(34),chr(10))
- Output:
> gbs3 quine_1.gambas dim s as string="dim s as string=&1&2&3&4print subst(s,chr(34),s,chr(34),chr(10))" print subst(s,chr(34),s,chr(34),chr(10))
GAP
f:=function ( )
Print( "f:=", f, ";;\nf();\n" );
return;
end;;
f();
Gema
*=$1@quote{$1}\}\n@abort;@{\*\=\$1\@quote\{\$1\}\\\}\\n\@abort\;\@\{}
Go
package main
import "fmt"
func main() {
a := "package main\n\nimport \"fmt\"\n\nfunc main() {\n\ta := %q\n\tfmt.Printf(a, a)\n}\n"
fmt.Printf(a, a)
}
Groovy
There are several ways to do this. Here are five:
s="s=%s;printf s,s.inspect()";printf s,s.inspect()
evaluate s='char q=39;print"evaluate s=$q$s$q"'
s="s=%c%s%c;printf s,34,s,34";printf s,34,s,34
s='s=%c%s%1$c;printf s,39,s';printf s,39,s
printf _='printf _=%c%s%1$c,39,_',39,_
Also Groovy has a trivial solution of an empty (0 length) file even though that isn't an allowable solution here.
GW-BASIC
10 LIST
Hare
use fmt;
const src: str = "use fmt;
const src: str = {0}{1}{0};
export fn main() void = {{fmt::printfln(src, '{0}', src)!;}};";
export fn main() void = {fmt::printfln(src, '"', src)!;};
Haskell
(Haskell does not provide access to a source-code equivalent representation of the code at runtime.)
In Haskell, function arguments are not surrounded by parentheses, which permits a simple quine where there is only the unquoted code followed by the quoted code.
let q s = putStrLn (s ++ show s) in q "let q s = putStrLn (s ++ show s) in q "
It is also possible to eliminate one or both of the variables (point-free style): the let
can be replaced with a lambda. (.
is function composition.)
(\s -> putStrLn (s ++ show s)) "(\\s -> putStrLn (s ++ show s)) "
(putStrLn . \s -> s ++ show s) "(putStrLn . \\s -> s ++ show s) "
and s
can be replaced by ap
, which when applied to functions has the effect of the S combinator:
import Control.Monad.Reader
(putStrLn . ap (++) show) "(putStrLn . ap (++) show) "
Since Haskell is a purely functional language, it is better at evaluating to things than printing them out. The following expression evaluates to a string of itself:
ap(++)show"ap(++)show"
Finally, here is a standalone program (the preceding examples only work in the REPL):
main = putStrLn $ (++) <*> show $ "main = putStrLn $ (++) <*> show $ "
Hoon
Unfortunately, this is quite a long quine due to the pretty-printing that is employeed. A majority of the code is fixing up the printed result of the array so it can be ran directly.
!: :- %say |= [^ [~ ~]] =+ ^= s ((list ,@tas) ~['!: :- %say |= [^ [~ ~]] =+ ^= s ((list ,@tas) ~[' 'x' ']) :- %noun (,tape (turn s |=(a=@tas ?:(=(a %x) (crip `(list ,@tas)`(turn s |=(b=@tas =+([s=?:(=(b %x) " " "") m=(trip [[User:Wodan58|Wodan58]] ([[User talk:Wodan58|talk]])27.)] (crip :(welp s m (trip b) m s)))))) a))))']) :- %noun (,tape (turn s |=(a=@tas ?:(=(a %x) (crip `(list ,@tas)`(turn s |=(b=@tas =+([s=?:(=(b %x) " " "") m=(trip [[User:Wodan58|Wodan58]] ([[User talk:Wodan58|talk]])27.)] (crip :(welp s m (trip b) m s)))))) a))))
Two much shorter quines were created and tweeted from the @urbit_ twitter account, which might be more interesting:
=-(`@t`(rap 3 - (scot %uw -) ")") 0wwai8F.8y0Fb.i1Tti.kwt6Z.zsOww.bi0P8.71xsy.xwt41.wa2QZ)
=<(`_""`~[. `@`39 . `@`10.535] '=<(`_""`~[. `@`39 . `@`10.535] ')
HQ9+
Any program with a single “Q” is a quine. The simplest possible such program is just this:
Q
HTML
Using CSS
This solution uses CSS to print out the source itself, e.g. the "direct accessing" method. Doesn't work in Internet Explorer; try it in one of Opera, Firefox, Safari, Chromium etc.
<!DOCTYPE html>
<html>
<head>
<title>HTML/CSS Quine</title>
<style type="text/css">
* { font: 10pt monospace; }
head, style { display: block; }
style { white-space: pre; }
style:before {
content:
"\3C""!DOCTYPE html\3E"
"\A\3Chtml\3E\A"
"\3Chead\3E\A"
"\9\3Ctitle\3E""HTML/CSS Quine""\3C/title\3E\A"
"\9\3Cstyle type=\22text/css\22\3E";
}
style:after {
content:
"\3C/style\3E\A"
"\3C/head\3E\A"
"\3C""body\3E\3C/body\3E\A"
"\3C/html\3E";
}
</style>
</head>
<body></body>
</html>
Huginn
#! /bin/sh
exec huginn --no-argv -E "${0}"
#! huginn
main() {
c = "#! /bin/sh{1}~"
"exec huginn --no-argv -E {3}${{0}}{3}{1}#! huginn{1}{1}~"
"main() {{{1}{2}c = {3}{0}{3};{1}{2}print({1}~"
"{2}{2}copy( c ).replace( {3}{5}{3}, {3}{3} )~"
".format({1}{2}{2}{2}c.replace( {3}{5}{3}, ~"
"{3}{5}{4}{3}{4}n{4}t{4}t{4}{3}{3} ), ~"
"{3}{4}n{3}, {3}{4}t{3}, {3}{4}{3}{3}, {3}{4}{4}{3}, ~"
"{3}{5}{3}{1}{2}{2}){1}{2});{1}}}{1}{1}";
print(
copy( c ).replace( "~", "" ).format(
c.replace( "~", "~\"\n\t\t\"" ), "\n", "\t", "\"", "\\", "~"
)
);
}
Icon and Unicon
Inform 7
R is a room. To quit: (- quit; -). When play begins: say entry 1 in Q; say Q in brace notation; quit. Q is a list of text variable. Q is {"R is a room. To quit: (- quit; -). When play begins: say entry 1 in Q; say Q in brace notation; quit. Q is a list of text variable. Q is "}
Insitux
(#(join(char-code 34)[% %(char-code 41)])"(#(join(char-code 34)[% %(char-code 41)])")
INTERCAL
Several versions of an Intercal quine can be found at Brian Raiter's quine.i dissected, together with a detailed explanation of the way the final 3,629 byte version works.
Io
thisMessage print
J
Technically, the empty program in J is a quine, as it has an empty result. For example:
Also, many many numbers in J are quines. For example (result not shown, here, for clarity):
0
Note: this implementation assumes that J is being used interactively. If J is being used in a command line script, having the script read and output itself would be a better approach. And it's not clear whether quines are a relevant concept in a none textual context (such as a windowing environment).
And other solutions are also possible.
Java
Copied from The Quine Page
Author: Bertram Felgenhauer
class S{public static void main(String[]a){String s="class S{public static void main(String[]a){String s=;char c=34;System.out.println(s.substring(0,52)+c+s+c+s.substring(52));}}";char c=34;System.out.println(s.substring(0,52)+c+s+c+s.substring(52));}}
class S{public static void main(String[]a){String p="class S{public static void main(String[]a){String p=%c%s%1$c;System.out.printf(p,34,p);}}";System.out.printf(p,34,p);}}
JavaScript
1.7.0
(function(){print("("+arguments.callee.toString().replace(/\s/g,'')+")()");})()
Using eval
1.7.0
This version doesn't use arguments.callee.toString() to return the string representation of itself. Instead, it relies on eval().
var code='var q=String.fromCharCode(39);print("var code="+q+code+q+";eval(code)")';eval(code)
Replacing String
(function(){str=["(function(){str=[F].join(String.fromCharCode(34));str=str.replace(/F/,String.fromCharCode(34)+str+String.fromCharCode(34));console.log(str)})()"].join(String.fromCharCode(34));str=str.replace(/F/,String.fromCharCode(34)+str+String.fromCharCode(34));console.log(str)})()
encodeURI as string escapes
Functions like encodeURI/decodeURI
benefit js with highly controllable string escapes, like the quotes, newlines, etc. Thus, the following js-flavored quine requires no explicit or implicit stringify
, eval
or template literals functionalities:
let x="let x=%22quinner%22; alert(decodeURI(x).replace(%22quinner%22, x));"; alert(decodeURI(x).replace("quinner", x));
Code As Data
ES6 expression that evaluates to the expression (eval(expression) === expression
)
(($)=>$+JSON.stringify($)+")")("(($)=>$+JSON.stringify($)+\")\")(")
ES5 version of above
(function($){return $+JSON.stringify($)+")"})("(function($){return $+JSON.stringify($)+\")\"})(")
prints itself via console.log
(note console.log
is not in the ECMAScript Standard)
q=`%3Bconsole.log(%60q%3D%5C%60%24%7Bq%7D%5C%60%60%2BdecodeURIComponent(q))`;console.log(`q=\`${q}\``+decodeURIComponent(q))
Another Method
var a=function () {var b="var a="+a.toString()+"\;a()";alert(b)};a()
A simple module which simply evaluates to itself
(function f() {
return '(' + f.toString() + ')();';
})();
- Output:
(function f() {
return '(' + f.toString() + ')();';
})();
Or logs itself to the console
(function f() {
console.log('(' + f.toString() + ')();');
})();
- Output:
(function f() { console.log('(' + f.toString() + ')();'); })();
ES6 syntax
(f=_=>`(f=${f})()`)()
with 2 statements:
f=_=>`f=${f};f()`;f()
ASCII Art
q=u=>(`in equinequ inequinequinequinequinequi nequinequinequinequinequinequi
nequinequineq uinequin equinequinequinequinequineq uinequinequinequinequinequineq
uinequinequinequi nequineq uinequinequinequinequinequin equinequinequinequinequinequin
equinequinequinequinequineq uinequinequinequinequine`,e=' q='+q+';q()',`uinequinequinequ
inequine quinequi nequine quinequ inequi nequinequine quinequi nequine quineq
uinequi nequine quinequ inequin equine quinequinequi nequineq uinequi
nequine quinequ inequin equineq uinequ inequinequineq uinequin equinequinequineq
uinequi nequine quinequ inequin equine quinequi nequin equinequ inequinequinequin
equineq uinequi nequine quinequ inequi nequineq uinequinequine quinequinequinequ
inequin equineq uinequi nequine quineq uinequin equinequinequ inequinequinequin
equineq uinequineq uinequi nequine quineq uinequin equinequineq uinequi
nequineq uinequineq uinequin equinequ inequi nequineq uinequinequ inequin equine
quinequinequinequin equinequinequinequi nequinequinequineq uinequinequinequinequinequinequi
nequinequinequine quinequinequinequ inequinequinequine quinequinequinequinequinequineq
uinequinequine quinequinequi nequinequinequineq uinequinequinequinequinequineq
uinequinequine quinequin equinequinequinequ inequinequinequinequinequineq
uineq`,
e);q()
Joy
"dup put putchars 10 putch." dup put putchars 10 putch.
Jsish
Based on Javascript eval solution.
var code='var q=String.fromCharCode(39);puts("var code="+q+code+q+";eval(code)")';eval(code)
- Output:
Double test, run quine.jsi output through the jsish argument evaluator:
prompt$ jsish -e "$(jsish quine.jsi)" var code='var q=String.fromCharCode(39);puts("var code="+q+code+q+";eval(code)")';eval(code)
Julia
x="println(\"x=\$(repr(x))\\n\$x\")"
println("x=$(repr(x))\n$x")
In Julia, $x in a string literal interpolates the value of the variable into the string. $(expression) evaluates the expression and interpolates the result into the string. Normally, the string value "hi\tworld" would be inserted without quotation marks and with a literal tab. The repr function returns a string value that contains quotation marks and in which the literal tab is replaced by the characters \t. When the result of the repr function is interpolated, the result is what you would type into your code to create that string literal.
Kotlin
The following is based on the classic C quine but makes use of Kotlin's 'raw' (i.e. triple quoted) string literals.
// version 1.1.2
const val F = """// version 1.1.2
const val F = %c%c%c%s%c%c%c
fun main(args: Array<String>) {
System.out.printf(F, 34, 34, 34, F, 34, 34, 34)
}
"""
fun main(args: Array<String>) {
System.out.printf(F, 34, 34, 34, F, 34, 34, 34)
}
Lambdatalk
{{lambda {:x} :x} '{lambda {:x} :x}}
-> {lambda {:x} :x}
Lang
# Execute in command line without any arguments except this Lang file
lang.name = Quine
lang.version = v1.0.0
$h = {{{# Execute in command line without any arguments except this Lang file
lang.name = Quine
lang.version = v1.0.0}}}
$s = {{{func.printf($h\n\n\$h \= %s{{%s}}%s\n\$s \= %s{{%s}}%s\n%s, {, $h, }, {, $s, }, $s)}}}
func.printf($h\n\n\$h \= %s{{%s}}%s\n\$s \= %s{{%s}}%s\n%s, {, $h, }, {, $s, }, $s)
Lasso
In template mode, any text that doesn't include Lasso tags is a trivial quine, because it is passed through unmodified by the interpreter. But here is a more traditional quine:
var(a=(:10,39,118,97,114,40,97,61,40,58,39,10,36,97,45,62,106,111,105,110,40,39,44,39,41,10,39,41,41,39,10,118,97,114,40,98,61,98,121,116,101,115,41,10,36,97,45,62,102,111,114,101,97,99,104,32,61,62,32,123,32,36,98,45,62,105,109,112,111,114,116,56,98,105,116,115,40,35,49,41,32,125,10,36,98,45,62,97,115,83,116,114,105,110,103))
'var(a=(:'
$a->join(',')
'))'
var(b=bytes)
$a->foreach => { $b->import8bits(#1) }
$b->asString
LDPL
DATA:
A IS NUMBER VECTOR
C IS TEXT
N IS NUMBER
I IS NUMBER
J IS NUMBER
PROCEDURE:
SUB-PROCEDURE SHOWU
STORE 0 IN I
WHILE I IS LESS THAN N DO
DISPLAY " STORE "
DISPLAY A:I
DISPLAY " IN "
DISPLAY " A:"
DISPLAY I CRLF
ADD I AND 1 IN I
REPEAT
DISPLAY " STORE "
DISPLAY N
DISPLAY " IN N" CRLF
END SUB-PROCEDURE
SUB-PROCEDURE SHOW
STORE 0 IN J
WHILE J IS LESS THAN N DO
IF A:J IS EQUAL TO 42 THEN
CALL SUB-PROCEDURE SHOWU
ELSE
STORE CHARACTER A:J IN C
DISPLAY C
END-IF
ADD J AND 1 IN J
REPEAT
END SUB-PROCEDURE
STORE 10 IN A:0
STORE 68 IN A:1
STORE 65 IN A:2
STORE 84 IN A:3
STORE 65 IN A:4
STORE 58 IN A:5
STORE 10 IN A:6
STORE 32 IN A:7
STORE 32 IN A:8
STORE 65 IN A:9
STORE 32 IN A:10
STORE 73 IN A:11
STORE 83 IN A:12
STORE 32 IN A:13
STORE 78 IN A:14
STORE 85 IN A:15
STORE 77 IN A:16
STORE 66 IN A:17
STORE 69 IN A:18
STORE 82 IN A:19
STORE 32 IN A:20
STORE 86 IN A:21
STORE 69 IN A:22
STORE 67 IN A:23
STORE 84 IN A:24
STORE 79 IN A:25
STORE 82 IN A:26
STORE 10 IN A:27
STORE 32 IN A:28
STORE 32 IN A:29
STORE 67 IN A:30
STORE 32 IN A:31
STORE 73 IN A:32
STORE 83 IN A:33
STORE 32 IN A:34
STORE 84 IN A:35
STORE 69 IN A:36
STORE 88 IN A:37
STORE 84 IN A:38
STORE 10 IN A:39
STORE 32 IN A:40
STORE 32 IN A:41
STORE 78 IN A:42
STORE 32 IN A:43
STORE 73 IN A:44
STORE 83 IN A:45
STORE 32 IN A:46
STORE 78 IN A:47
STORE 85 IN A:48
STORE 77 IN A:49
STORE 66 IN A:50
STORE 69 IN A:51
STORE 82 IN A:52
STORE 10 IN A:53
STORE 32 IN A:54
STORE 32 IN A:55
STORE 73 IN A:56
STORE 32 IN A:57
STORE 73 IN A:58
STORE 83 IN A:59
STORE 32 IN A:60
STORE 78 IN A:61
STORE 85 IN A:62
STORE 77 IN A:63
STORE 66 IN A:64
STORE 69 IN A:65
STORE 82 IN A:66
STORE 10 IN A:67
STORE 32 IN A:68
STORE 32 IN A:69
STORE 74 IN A:70
STORE 32 IN A:71
STORE 73 IN A:72
STORE 83 IN A:73
STORE 32 IN A:74
STORE 78 IN A:75
STORE 85 IN A:76
STORE 77 IN A:77
STORE 66 IN A:78
STORE 69 IN A:79
STORE 82 IN A:80
STORE 10 IN A:81
STORE 80 IN A:82
STORE 82 IN A:83
STORE 79 IN A:84
STORE 67 IN A:85
STORE 69 IN A:86
STORE 68 IN A:87
STORE 85 IN A:88
STORE 82 IN A:89
STORE 69 IN A:90
STORE 58 IN A:91
STORE 10 IN A:92
STORE 10 IN A:93
STORE 32 IN A:94
STORE 32 IN A:95
STORE 83 IN A:96
STORE 85 IN A:97
STORE 66 IN A:98
STORE 45 IN A:99
STORE 80 IN A:100
STORE 82 IN A:101
STORE 79 IN A:102
STORE 67 IN A:103
STORE 69 IN A:104
STORE 68 IN A:105
STORE 85 IN A:106
STORE 82 IN A:107
STORE 69 IN A:108
STORE 32 IN A:109
STORE 83 IN A:110
STORE 72 IN A:111
STORE 79 IN A:112
STORE 87 IN A:113
STORE 85 IN A:114
STORE 10 IN A:115
STORE 32 IN A:116
STORE 32 IN A:117
STORE 32 IN A:118
STORE 32 IN A:119
STORE 83 IN A:120
STORE 84 IN A:121
STORE 79 IN A:122
STORE 82 IN A:123
STORE 69 IN A:124
STORE 32 IN A:125
STORE 48 IN A:126
STORE 32 IN A:127
STORE 73 IN A:128
STORE 78 IN A:129
STORE 32 IN A:130
STORE 73 IN A:131
STORE 10 IN A:132
STORE 32 IN A:133
STORE 32 IN A:134
STORE 32 IN A:135
STORE 32 IN A:136
STORE 87 IN A:137
STORE 72 IN A:138
STORE 73 IN A:139
STORE 76 IN A:140
STORE 69 IN A:141
STORE 32 IN A:142
STORE 73 IN A:143
STORE 32 IN A:144
STORE 73 IN A:145
STORE 83 IN A:146
STORE 32 IN A:147
STORE 76 IN A:148
STORE 69 IN A:149
STORE 83 IN A:150
STORE 83 IN A:151
STORE 32 IN A:152
STORE 84 IN A:153
STORE 72 IN A:154
STORE 65 IN A:155
STORE 78 IN A:156
STORE 32 IN A:157
STORE 78 IN A:158
STORE 32 IN A:159
STORE 68 IN A:160
STORE 79 IN A:161
STORE 10 IN A:162
STORE 32 IN A:163
STORE 32 IN A:164
STORE 32 IN A:165
STORE 32 IN A:166
STORE 32 IN A:167
STORE 32 IN A:168
STORE 32 IN A:169
STORE 32 IN A:170
STORE 68 IN A:171
STORE 73 IN A:172
STORE 83 IN A:173
STORE 80 IN A:174
STORE 76 IN A:175
STORE 65 IN A:176
STORE 89 IN A:177
STORE 32 IN A:178
STORE 34 IN A:179
STORE 32 IN A:180
STORE 32 IN A:181
STORE 83 IN A:182
STORE 84 IN A:183
STORE 79 IN A:184
STORE 82 IN A:185
STORE 69 IN A:186
STORE 32 IN A:187
STORE 34 IN A:188
STORE 10 IN A:189
STORE 32 IN A:190
STORE 32 IN A:191
STORE 32 IN A:192
STORE 32 IN A:193
STORE 32 IN A:194
STORE 32 IN A:195
STORE 32 IN A:196
STORE 32 IN A:197
STORE 68 IN A:198
STORE 73 IN A:199
STORE 83 IN A:200
STORE 80 IN A:201
STORE 76 IN A:202
STORE 65 IN A:203
STORE 89 IN A:204
STORE 32 IN A:205
STORE 65 IN A:206
STORE 58 IN A:207
STORE 73 IN A:208
STORE 10 IN A:209
STORE 32 IN A:210
STORE 32 IN A:211
STORE 32 IN A:212
STORE 32 IN A:213
STORE 32 IN A:214
STORE 32 IN A:215
STORE 32 IN A:216
STORE 32 IN A:217
STORE 68 IN A:218
STORE 73 IN A:219
STORE 83 IN A:220
STORE 80 IN A:221
STORE 76 IN A:222
STORE 65 IN A:223
STORE 89 IN A:224
STORE 32 IN A:225
STORE 34 IN A:226
STORE 32 IN A:227
STORE 73 IN A:228
STORE 78 IN A:229
STORE 32 IN A:230
STORE 34 IN A:231
STORE 10 IN A:232
STORE 32 IN A:233
STORE 32 IN A:234
STORE 32 IN A:235
STORE 32 IN A:236
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STORE 32 IN A:239
STORE 32 IN A:240
STORE 68 IN A:241
STORE 73 IN A:242
STORE 83 IN A:243
STORE 80 IN A:244
STORE 76 IN A:245
STORE 65 IN A:246
STORE 89 IN A:247
STORE 32 IN A:248
STORE 34 IN A:249
STORE 32 IN A:250
STORE 65 IN A:251
STORE 58 IN A:252
STORE 34 IN A:253
STORE 10 IN A:254
STORE 32 IN A:255
STORE 32 IN A:256
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STORE 32 IN A:261
STORE 32 IN A:262
STORE 68 IN A:263
STORE 73 IN A:264
STORE 83 IN A:265
STORE 80 IN A:266
STORE 76 IN A:267
STORE 65 IN A:268
STORE 89 IN A:269
STORE 32 IN A:270
STORE 73 IN A:271
STORE 32 IN A:272
STORE 67 IN A:273
STORE 82 IN A:274
STORE 76 IN A:275
STORE 70 IN A:276
STORE 10 IN A:277
STORE 32 IN A:278
STORE 32 IN A:279
STORE 32 IN A:280
STORE 32 IN A:281
STORE 32 IN A:282
STORE 32 IN A:283
STORE 32 IN A:284
STORE 32 IN A:285
STORE 65 IN A:286
STORE 68 IN A:287
STORE 68 IN A:288
STORE 32 IN A:289
STORE 73 IN A:290
STORE 32 IN A:291
STORE 65 IN A:292
STORE 78 IN A:293
STORE 68 IN A:294
STORE 32 IN A:295
STORE 49 IN A:296
STORE 32 IN A:297
STORE 73 IN A:298
STORE 78 IN A:299
STORE 32 IN A:300
STORE 73 IN A:301
STORE 10 IN A:302
STORE 32 IN A:303
STORE 32 IN A:304
STORE 32 IN A:305
STORE 32 IN A:306
STORE 82 IN A:307
STORE 69 IN A:308
STORE 80 IN A:309
STORE 69 IN A:310
STORE 65 IN A:311
STORE 84 IN A:312
STORE 10 IN A:313
STORE 32 IN A:314
STORE 32 IN A:315
STORE 32 IN A:316
STORE 32 IN A:317
STORE 68 IN A:318
STORE 73 IN A:319
STORE 83 IN A:320
STORE 80 IN A:321
STORE 76 IN A:322
STORE 65 IN A:323
STORE 89 IN A:324
STORE 32 IN A:325
STORE 34 IN A:326
STORE 32 IN A:327
STORE 32 IN A:328
STORE 83 IN A:329
STORE 84 IN A:330
STORE 79 IN A:331
STORE 82 IN A:332
STORE 69 IN A:333
STORE 32 IN A:334
STORE 34 IN A:335
STORE 10 IN A:336
STORE 32 IN A:337
STORE 32 IN A:338
STORE 32 IN A:339
STORE 32 IN A:340
STORE 68 IN A:341
STORE 73 IN A:342
STORE 83 IN A:343
STORE 80 IN A:344
STORE 76 IN A:345
STORE 65 IN A:346
STORE 89 IN A:347
STORE 32 IN A:348
STORE 78 IN A:349
STORE 10 IN A:350
STORE 32 IN A:351
STORE 32 IN A:352
STORE 32 IN A:353
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STORE 68 IN A:355
STORE 73 IN A:356
STORE 83 IN A:357
STORE 80 IN A:358
STORE 76 IN A:359
STORE 65 IN A:360
STORE 89 IN A:361
STORE 32 IN A:362
STORE 34 IN A:363
STORE 32 IN A:364
STORE 73 IN A:365
STORE 78 IN A:366
STORE 32 IN A:367
STORE 78 IN A:368
STORE 34 IN A:369
STORE 32 IN A:370
STORE 67 IN A:371
STORE 82 IN A:372
STORE 76 IN A:373
STORE 70 IN A:374
STORE 10 IN A:375
STORE 32 IN A:376
STORE 32 IN A:377
STORE 69 IN A:378
STORE 78 IN A:379
STORE 68 IN A:380
STORE 32 IN A:381
STORE 83 IN A:382
STORE 85 IN A:383
STORE 66 IN A:384
STORE 45 IN A:385
STORE 80 IN A:386
STORE 82 IN A:387
STORE 79 IN A:388
STORE 67 IN A:389
STORE 69 IN A:390
STORE 68 IN A:391
STORE 85 IN A:392
STORE 82 IN A:393
STORE 69 IN A:394
STORE 10 IN A:395
STORE 10 IN A:396
STORE 32 IN A:397
STORE 32 IN A:398
STORE 83 IN A:399
STORE 85 IN A:400
STORE 66 IN A:401
STORE 45 IN A:402
STORE 80 IN A:403
STORE 82 IN A:404
STORE 79 IN A:405
STORE 67 IN A:406
STORE 69 IN A:407
STORE 68 IN A:408
STORE 85 IN A:409
STORE 82 IN A:410
STORE 69 IN A:411
STORE 32 IN A:412
STORE 83 IN A:413
STORE 72 IN A:414
STORE 79 IN A:415
STORE 87 IN A:416
STORE 10 IN A:417
STORE 32 IN A:418
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STORE 32 IN A:421
STORE 83 IN A:422
STORE 84 IN A:423
STORE 79 IN A:424
STORE 82 IN A:425
STORE 69 IN A:426
STORE 32 IN A:427
STORE 48 IN A:428
STORE 32 IN A:429
STORE 73 IN A:430
STORE 78 IN A:431
STORE 32 IN A:432
STORE 74 IN A:433
STORE 10 IN A:434
STORE 32 IN A:435
STORE 32 IN A:436
STORE 32 IN A:437
STORE 32 IN A:438
STORE 87 IN A:439
STORE 72 IN A:440
STORE 73 IN A:441
STORE 76 IN A:442
STORE 69 IN A:443
STORE 32 IN A:444
STORE 74 IN A:445
STORE 32 IN A:446
STORE 73 IN A:447
STORE 83 IN A:448
STORE 32 IN A:449
STORE 76 IN A:450
STORE 69 IN A:451
STORE 83 IN A:452
STORE 83 IN A:453
STORE 32 IN A:454
STORE 84 IN A:455
STORE 72 IN A:456
STORE 65 IN A:457
STORE 78 IN A:458
STORE 32 IN A:459
STORE 78 IN A:460
STORE 32 IN A:461
STORE 68 IN A:462
STORE 79 IN A:463
STORE 10 IN A:464
STORE 32 IN A:465
STORE 32 IN A:466
STORE 32 IN A:467
STORE 32 IN A:468
STORE 32 IN A:469
STORE 32 IN A:470
STORE 32 IN A:471
STORE 32 IN A:472
STORE 73 IN A:473
STORE 70 IN A:474
STORE 32 IN A:475
STORE 65 IN A:476
STORE 58 IN A:477
STORE 74 IN A:478
STORE 32 IN A:479
STORE 73 IN A:480
STORE 83 IN A:481
STORE 32 IN A:482
STORE 69 IN A:483
STORE 81 IN A:484
STORE 85 IN A:485
STORE 65 IN A:486
STORE 76 IN A:487
STORE 32 IN A:488
STORE 84 IN A:489
STORE 79 IN A:490
STORE 32 IN A:491
STORE 52 IN A:492
STORE 50 IN A:493
STORE 32 IN A:494
STORE 84 IN A:495
STORE 72 IN A:496
STORE 69 IN A:497
STORE 78 IN A:498
STORE 10 IN A:499
STORE 32 IN A:500
STORE 32 IN A:501
STORE 32 IN A:502
STORE 32 IN A:503
STORE 32 IN A:504
STORE 32 IN A:505
STORE 32 IN A:506
STORE 32 IN A:507
STORE 32 IN A:508
STORE 32 IN A:509
STORE 67 IN A:510
STORE 65 IN A:511
STORE 76 IN A:512
STORE 76 IN A:513
STORE 32 IN A:514
STORE 83 IN A:515
STORE 85 IN A:516
STORE 66 IN A:517
STORE 45 IN A:518
STORE 80 IN A:519
STORE 82 IN A:520
STORE 79 IN A:521
STORE 67 IN A:522
STORE 69 IN A:523
STORE 68 IN A:524
STORE 85 IN A:525
STORE 82 IN A:526
STORE 69 IN A:527
STORE 32 IN A:528
STORE 83 IN A:529
STORE 72 IN A:530
STORE 79 IN A:531
STORE 87 IN A:532
STORE 85 IN A:533
STORE 10 IN A:534
STORE 32 IN A:535
STORE 32 IN A:536
STORE 32 IN A:537
STORE 32 IN A:538
STORE 32 IN A:539
STORE 32 IN A:540
STORE 32 IN A:541
STORE 32 IN A:542
STORE 69 IN A:543
STORE 76 IN A:544
STORE 83 IN A:545
STORE 69 IN A:546
STORE 10 IN A:547
STORE 32 IN A:548
STORE 32 IN A:549
STORE 32 IN A:550
STORE 32 IN A:551
STORE 32 IN A:552
STORE 32 IN A:553
STORE 32 IN A:554
STORE 32 IN A:555
STORE 32 IN A:556
STORE 32 IN A:557
STORE 83 IN A:558
STORE 84 IN A:559
STORE 79 IN A:560
STORE 82 IN A:561
STORE 69 IN A:562
STORE 32 IN A:563
STORE 67 IN A:564
STORE 72 IN A:565
STORE 65 IN A:566
STORE 82 IN A:567
STORE 65 IN A:568
STORE 67 IN A:569
STORE 84 IN A:570
STORE 69 IN A:571
STORE 82 IN A:572
STORE 32 IN A:573
STORE 65 IN A:574
STORE 58 IN A:575
STORE 74 IN A:576
STORE 32 IN A:577
STORE 73 IN A:578
STORE 78 IN A:579
STORE 32 IN A:580
STORE 67 IN A:581
STORE 10 IN A:582
STORE 32 IN A:583
STORE 32 IN A:584
STORE 32 IN A:585
STORE 32 IN A:586
STORE 32 IN A:587
STORE 32 IN A:588
STORE 32 IN A:589
STORE 32 IN A:590
STORE 32 IN A:591
STORE 32 IN A:592
STORE 68 IN A:593
STORE 73 IN A:594
STORE 83 IN A:595
STORE 80 IN A:596
STORE 76 IN A:597
STORE 65 IN A:598
STORE 89 IN A:599
STORE 32 IN A:600
STORE 67 IN A:601
STORE 10 IN A:602
STORE 32 IN A:603
STORE 32 IN A:604
STORE 32 IN A:605
STORE 32 IN A:606
STORE 32 IN A:607
STORE 32 IN A:608
STORE 32 IN A:609
STORE 32 IN A:610
STORE 69 IN A:611
STORE 78 IN A:612
STORE 68 IN A:613
STORE 45 IN A:614
STORE 73 IN A:615
STORE 70 IN A:616
STORE 10 IN A:617
STORE 32 IN A:618
STORE 32 IN A:619
STORE 32 IN A:620
STORE 32 IN A:621
STORE 32 IN A:622
STORE 32 IN A:623
STORE 32 IN A:624
STORE 32 IN A:625
STORE 65 IN A:626
STORE 68 IN A:627
STORE 68 IN A:628
STORE 32 IN A:629
STORE 74 IN A:630
STORE 32 IN A:631
STORE 65 IN A:632
STORE 78 IN A:633
STORE 68 IN A:634
STORE 32 IN A:635
STORE 49 IN A:636
STORE 32 IN A:637
STORE 73 IN A:638
STORE 78 IN A:639
STORE 32 IN A:640
STORE 74 IN A:641
STORE 10 IN A:642
STORE 32 IN A:643
STORE 32 IN A:644
STORE 32 IN A:645
STORE 32 IN A:646
STORE 82 IN A:647
STORE 69 IN A:648
STORE 80 IN A:649
STORE 69 IN A:650
STORE 65 IN A:651
STORE 84 IN A:652
STORE 10 IN A:653
STORE 32 IN A:654
STORE 32 IN A:655
STORE 69 IN A:656
STORE 78 IN A:657
STORE 68 IN A:658
STORE 32 IN A:659
STORE 83 IN A:660
STORE 85 IN A:661
STORE 66 IN A:662
STORE 45 IN A:663
STORE 80 IN A:664
STORE 82 IN A:665
STORE 79 IN A:666
STORE 67 IN A:667
STORE 69 IN A:668
STORE 68 IN A:669
STORE 85 IN A:670
STORE 82 IN A:671
STORE 69 IN A:672
STORE 10 IN A:673
STORE 10 IN A:674
STORE 42 IN A:675
STORE 10 IN A:676
STORE 32 IN A:677
STORE 32 IN A:678
STORE 67 IN A:679
STORE 65 IN A:680
STORE 76 IN A:681
STORE 76 IN A:682
STORE 32 IN A:683
STORE 83 IN A:684
STORE 85 IN A:685
STORE 66 IN A:686
STORE 45 IN A:687
STORE 80 IN A:688
STORE 82 IN A:689
STORE 79 IN A:690
STORE 67 IN A:691
STORE 69 IN A:692
STORE 68 IN A:693
STORE 85 IN A:694
STORE 82 IN A:695
STORE 69 IN A:696
STORE 32 IN A:697
STORE 83 IN A:698
STORE 72 IN A:699
STORE 79 IN A:700
STORE 87 IN A:701
STORE 10 IN A:702
STORE 10 IN A:703
STORE 704 IN N
CALL SUB-PROCEDURE SHOW
Liberty BASIC
s$ = "s$ = : Print Left$(s$, 5) + chr$(34) + s$ + chr$(34) + Mid$(s$, 5)" : Print Left$(s$, 5) + chr$(34) + s$ + chr$(34) + Mid$(s$, 5)
LIL
LIL is a library with lil, an interactive shell. In the interactive shell
# reflect this reflect this
Source from a file read from lil when the shell is invoked gets a little trickier. The interactive shell wraps code read from files which changes this. So, as a testament to ease of embedding, here's a new non-interactive LIL one liner shell so we can write [reflect this].
/*
One line of LIL, given as argv[1]
Tectonics: gcc -o lilone lilone.c lil.c -lm
./lilone 'print [reflect this]'
*/
#include <stdio.h>
#include "lil.h"
int main(int argc, char** argv) {
lil_t lil = lil_new();
lil_value_t result = lil_parse(lil, argv[1], 0, 1);
const char *show = lil_to_string(result);
if (show && show[0]) printf("%s\n", show);
lil_free_value(result);
lil_free(lil);
return 0;
}
- Output:
prompt$ gcc -o lilone lilone.c lil.c -lm prompt$ ./lilone 'print [reflect this]' print [reflect this] prompt$
More attractive in the capture, the above is not quite right when it comes to newlines. So, the better answer would be:
prompt$ ./lilone 'write [reflect this]' write [reflect this]prompt$
As an extra evaluation trial, command substitution from lilone, back into lilone:
prompt$ ./lilone "$(./lilone 'write [reflect this]')" write [reflect this]prompt$
To avoid illusions of cheating in lilone.
prompt$ ./lilone 'expr 6 * 7' 42
Use print [reflect this] if the input source ends in a newline or just write [reflect this].
Turns out the kernel of this quine can also be used with carefully selected surrounding code:
./lilone 'set something; write [reflect this]; write $something' set something; write [reflect this]; write $something
as one example
Lisp
Lisp has a mechanism to quote code without the need to use strings:
((lambda (x) (list x (list 'quote x)))
'(lambda (x) (list x (list 'quote x))))
Logo
Somewhat brute-force..
make "a [ 116 121 112 101 32 34 124 109 97 107 101 32 34 97 32 91 124 10 102 111 114 101 97 99 104 32 58 97 32 91 32 116 121 112 101 32 119 111 114 100 32 34 124 32 124 32 63 32 93 10 112 114 105 110 116 32 34 124 32 93 124 10 102 111 114 101 97 99 104 32 58 97 32 91 32 116 121 112 101 32 99 104 97 114 32 63 32 93 10 98 121 101 10 ]
type "|make "a [|
foreach :a [ type word "| | ? ]
print "| ]|
foreach :a [ type char ? ]
bye
Lua
s=[[io.write('s=[','[',s,']','];',s)]];io.write('s=[','[',s,']','];',s)
M2000 Interpreter
Module Alfa {
Rem {This Program Show itself in Help Form}
inline "help "+quote$(module.name$)
}
Alfa
M4
define(`quine',``$1(`$1')'')dnl
quine(`define(`quine',``$1(`$1')'')dnl
quine')
make
quine=$(info quine=$(value quine))$(info $$(quine))$(eval quine:;@:)
$(quine)
Mathematica /Wolfram Language
a="Print[\"a=\",InputForm[a],\";\",a]";Print["a=",InputForm[a],";",a]
or
a := Print[InputForm[Definition[a]], ";a"];a
or
(#1[#0[#1]] &)[Defer]
or
ToString[#0][] & []
or
Unevaluated[1989 - 1989]
or
x
:)
MATLAB / Octave
This script runs either from an m-file or directly from workspace (author: J. C. Lucero):
x='{>\(y>(((-y-(((<(^<ejtq)\{-y.2^*<';z=['x=''',x,''';'];disp([z,x-1]);
The example works for functions and scripts stored as m-files. It does not work for functions defined only in the workspace.
function quine()
fid = fopen([mfilename,'.m']);
while ~feof(fid)
printf('%s\n',fgetl(fid));
end;
fclose(fid);
end;
or
function quine()
type(mfilename);
end;
Without accessing the file:
function quine; y = 'function quine; y = %c%s%c; fprintf(1, y, 39, y, 39)\n'; fprintf(1, y, 39, y, 39)
Maxima
/* Using ?format from the underlying Lisp system */
lambda([],block([q:ascii(34),s:"lambda([],block([q:ascii(34),s:~A~A~A],print(?format(false,s,q,s,q))))()$"],print(?format(false,s,q,s,q))))()$
MiniScript
A simple one-liner:
s="s=;print s[:2]+char(34)+s+char(34)+s[2:]";print s[:2]+char(34)+s+char(34)+s[2:]
A multi-line version; and in this version, the hash character (ASCII code 35) is used to indicate where the string constant goes in the source. Also, semicolons (ASCII code 59) are used in this case as arbitrary line break indicators.
Q=char(34)
s="Q=char(34);s=#;for line in s.split(char(59)); print line.replace(char(35),Q+s+Q);end for"
for line in s.split(char(59))
print line.replace(char(35),Q+s+Q)
end for
Modula-2
MODULE Quine;
FROM FormatString IMPORT FormatString;
FROM Terminal IMPORT WriteString,ReadChar;
CONST src = "MODULE Quine;\nFROM FormatString IMPORT FormatString;\nFROM Terminal IMPORT WriteString,ReadChar;\n\nCONST src = \x022%s\x022;\nVAR buf : ARRAY[0..2048] OF CHAR;\nBEGIN\n FormatString(src, buf, src);\n WriteString(buf);\n ReadChar\nEND Quine.\n";
VAR buf : ARRAY[0..2048] OF CHAR;
BEGIN
FormatString(src, buf, src);
WriteString(buf);
ReadChar
END Quine.
MUMPS
QUINE
NEW I,L SET I=0
FOR SET I=I+1,L=$TEXT(+I) Q:L="" WRITE $TEXT(+I),!
KILL I,L
QUIT
SMALL
S %=0 F W $T(+$I(%)),! Q:$T(+%)=""
Both of the routines will work, but the second has the minor advantage of only using one variable instead of two.
NASM
Compiles to the source code when -f raw
%define a "%define "
%define b "db "
%define c "%deftok "
%define d "a, 97, 32, 34, a, 34, 10, a, 98, 32, 34, b, 34, 10, a, 99, 32, 34, c, 34, 10, a, 100, 32, 34, d, 34, 10, c, 101, 32, 100, 10, b, 101, 10"
%deftok e d
db e
NetRexx
/* NetRexx */
options replace format comments java crossref savelog symbols nobinary
Q = "'"
S = "\\"
N = "\n"
A = "&"
code = [ -
'/* NetRexx */', -
'options replace format comments java crossref savelog symbols nobinary', -
'', -
'Q = "&QS"', -
'S = "&ESC"', -
'N = "&NL"', -
'A = "&"', -
'code = [ -', -
'&REP', -
' ]', -
'', -
'pgm = ""', -
'txt = ""', -
'loop t_ = 0 for code.length', -
' txt = txt || " " || Q || code[t_] || Q || ", -" || N', -
' end t_', -
'txt = txt.strip("T", N)', -
'txt = txt.delstr(txt.lastpos(","), 1)', -
'', -
'K = ""', -
'K[0] = 5', -
'K[1] = A"NL"', -
'K[2] = A"AMP"', -
'K[3] = A"ESC"', -
'K[4] = A"QS"', -
'K[5] = A"REP"', -
'loop c_ = 0 for code.length', -
' loop v_ = 1 to K[0]', -
' T = K[v_]', -
' if code[c_].pos(T) <> 0 then do', -
' parse code[c_] pre(T)post', -
' select case T', -
' when K[1] then do', -
' code[c_] = pre || S || "n" || post', -
' end', -
' when K[2] then do', -
' code[c_] = pre || A || post', -
' end', -
' when K[3] then do', -
' code[c_] = pre || S || S || post', -
' end', -
' when K[4] then do', -
' code[c_] = pre || Q || post', -
' end', -
' when K[5] then do', -
' code[c_] = txt', -
' end', -
' otherwise nop', -
' end', -
' end', -
' end v_', -
' pgm = pgm || code[c_].strip("T") || N', -
' end c_', -
'pgm = pgm.strip("T", N) || N', -
'say pgm', -
'', -
'return', -
'' -
]
pgm = ""
txt = ""
loop t_ = 0 for code.length
txt = txt || " " || Q || code[t_] || Q || ", -" || N
end t_
txt = txt.strip("T", N)
txt = txt.delstr(txt.lastpos(","), 1)
K = ""
K[0] = 5
K[1] = A"NL"
K[2] = A"AMP"
K[3] = A"ESC"
K[4] = A"QS"
K[5] = A"REP"
loop c_ = 0 for code.length
loop v_ = 1 to K[0]
T = K[v_]
if code[c_].pos(T) <> 0 then do
parse code[c_] pre(T)post
select case T
when K[1] then do
code[c_] = pre || S || "n" || post
end
when K[2] then do
code[c_] = pre || A || post
end
when K[3] then do
code[c_] = pre || S || S || post
end
when K[4] then do
code[c_] = pre || Q || post
end
when K[5] then do
code[c_] = txt
end
otherwise nop
end
end
end v_
pgm = pgm || code[c_].strip("T") || N
end c_
pgm = pgm.strip("T", N) || N
say pgm
return
NewLISP
(lambda (s) (print (list s (list 'quote s))))
Nim
Another quine:
var x = "var x = echo x[0..7],chr(34),x,chr(34),chr(10),x[8 .. ^1]"
echo x[0..7],chr(34),x,chr(34),chr(10),x[8 .. ^1]
Another one:
import strutils; let a = "import strutils; let a = $#; echo a % (chr(34) & a & chr(34))"; echo a % (chr(34) & a & chr(34))
This quine prints its own sourcecode at compiletime as well as at runtime:
const x = "const x = |const y = x[0..9]&34.chr&x&34.chr&10.chr&x[11..100]&10.chr&x[102..115]&10.chr&x[117 .. ^1]|static: echo y|echo y"
const y = x[0..9]&34.chr&x&34.chr&10.chr&x[11..100]&10.chr&x[102..115]&10.chr&x[117 .. ^1]
static: echo y
echo y
Compile with: nim --verbosity:0 c quine
NS-HUBASIC
10 LIST
Oberon-2
MODULE M;
IMPORT O:=Out;
CONST
T=";PROCEDURE c*;BEGIN O.Char(22X);O.String(T) END c;BEGIN O.String('MODULE M;IMPORT O:=Out;CONST T=');c END M.";
PROCEDURE c*;
BEGIN
O.Char(22X);O.String(T)
END c;
BEGIN
O.String('MODULE M;IMPORT O:=Out;CONST T=');
c
END M.
Objeck
class Program { function : Main(args : String[]) ~ Nil { s := "class Program { function : Main(args : String[]) ~ Nil { s :=; IO.Console->Print(s->SubString(61))->Print(34->As(Char))->Print(s)->Print(34->As(Char))->PrintLine(s->SubString(61, 129)); } }"; IO.Console->Print(s->SubString(61))->Print(34->As(Char))->Print(s)->Print(34->As(Char))->PrintLine(s->SubString(61, 129)); } }
OCaml
(newline included)
(fun p -> Printf.printf p (string_of_format p)) "(fun p -> Printf.printf p (string_of_format p)) %S;;\n";;
Alternative: (newline included)
(fun s -> Printf.printf "%s%S;;\n" s s) "(fun s -> Printf.printf \"%s%S;;\\n\" s s) ";;
Odin
package quine
import "core:fmt"
main :: proc() {
q := `package quine
import "core:fmt"
main :: proc() {{
q := %c%s%c
fmt.printf(q, 96, q, 96)
}
`
fmt.printf(q, 96, q, 96)
}
Oforth
"dup 34 emit print 34 emit BL emit print" dup 34 emit print 34 emit BL emit print
Ol
Like others Lisps,
((lambda (s) (display (list s (list (quote quote) s)))) (quote (lambda (s) (display (list s (list (quote quote) s))))))
ooRexx
Cheating
say sourceline(1)
Non-Cheating, with INTERPRET
r="say'r='x2c(22)r||22~x2c';interpret r'";interpret r
Non-Cheating, without INTERPRET
r=";say'r=.'r'.'r~changestr(.,'22'x,2)";say'r="'r'"'r~changestr(.,'22'x,2)
Non-Cheating, without INTERPRET, with unprintable characters
Note: This version will not work correctly on an ASCII machine (where '07'x is the bell control code),
- it will only work correctly on an EBCDIC machine (where '07'x is the del control code).
The two unprintable characters are '07'x. Somewhat difficult to enter, but still a perfectly valid ooRexx program (and Quine).
r=";say'r=�'r'�'r~bitor(,' ')";say'r="'r'"'r~bitor(,' ')
OxygenBasic
'RUNTIME COMPILING
source="print source"
a=compile source : call a : freememory a
Oz
A one-liner that uses the ASCII code for "
to avoid "quoted quotes". We put the value assignment to the end by using multithreading and implicit synchronization on the dataflow variable I
.
declare I in thread {System.showInfo I#[34]#I#[34]} end I ="declare I in thread {System.showInfo I#[34]#I#[34]} end I ="
PARI/GP
()->quine
Assign this source code to variable quine:
quine=()->quine
Output of interpreter:
gp > quine ()->quine gp > quine() ()->quine gp > quine == quine() 1
The last command tests if source code in variable quine is equal to output of executed function quine(). This is true (1).
Pascal
A modification of one Pascal example (Author: Oliver Heen) from http://www.nyx.net/~gthompso/self_pasc.txt. This example includes newline at the end.
const s=';begin writeln(#99#111#110#115#116#32#115#61#39,s,#39,s)end.';begin writeln(#99#111#110#115#116#32#115#61#39,s,#39,s)end.
This version does compile in Free Pascal and UCSD Pascal. Newline included.
program Quine(Output);const A='program Quine(Output);const A=';B='begin writeln(A,char(39),A,char(39),char(59),char(66),char(61),char(39),B,char(39),char(59),B)end.';begin writeln(A,char(39),A,char(39),char(59),char(66),char(61),char(39),B,char(39),char(59),B)end.
A quality quine should not depend on a particular character set. This version also works on systems limited to 80-character lines and on legacy word-based systems which require literal strings to be packed and of a fixed size if assigned to an array.
program main(output);type string=packed array[1..60]of char;
var l:array[1..9]of string; c:array[1..7]of char; i:integer;
lc, a, o, k, n, e, s, t:char; begin
l[1]:='program main(output);type string=packed array[1..60]of char;';
l[2]:='var l:array[1..9]of string; c:array[1..7]of char; i:integer;';
l[3]:='lc, a, o, k, n, e, s, t:char; begin ';
l[4]:='for i := 1 to 3 do writeln(l[i]); ';
l[5]:='a:=c[1];t:=c[2];o:=c[3];k:=c[4];n:=c[5];e:=c[6];s:=c[7]; ';
l[6]:='for i := 1 to 9 do writeln(a,o,i:1,k,n,e,lc,l[i],lc,s); ';
l[7]:='writeln(a, t, n, e, lc, lc, lc, lc, s); ';
l[8]:='for i := 1 to 7 do write(t,o,i:1,k,n,e,lc,c[i],lc,s); ';
l[9]:='writeln; for i := 4 to 9 do writeln(l[i]); end. ';
lc:='''';
c[1]:='l';c[2]:='c';c[3]:='[';c[4]:=']';c[5]:=':';c[6]:='=';c[7]:=';';
for i := 1 to 3 do writeln(l[i]);
a:=c[1];t:=c[2];o:=c[3];k:=c[4];n:=c[5];e:=c[6];s:=c[7];
for i := 1 to 9 do writeln(a,o,i:1,k,n,e,lc,l[i],lc,s);
writeln(a, t, n, e, lc, lc, lc, lc, s);
for i := 1 to 7 do write(t,o,i:1,k,n,e,lc,c[i],lc,s);
writeln; for i := 4 to 9 do writeln(l[i]); end.
PascalABC.NET
## var a:='## var a:='';print(2*a[:12]+2*a[11:])';print(2*a[:12]+2*a[11:])
- Output:
## var a:='## var a:='';print(2*a[:12]+2*a[11:])';print(2*a[:12]+2*a[11:])
Perl
This relatively simple Perl example imitates the C example.
$s = q($s = q(%s); printf($s, $s);
); printf($s, $s);
Note the terminating newline.
Self-reading (some consider cheating)
Accessing source code via DATA
filehandle:
seek(DATA, 0, 0);
print <DATA>
__DATA__
even simpler:
open ME, $0 and print <ME>;
open 0; print <0>;
Quine Generator
Perhaps the simplest quine in Perl 5 is:
$_=q{print"\$_=q{$_};eval"};eval
By carefully examining the code, you will find that you can insert any valid perl sentences before and after the print statement in q{}. It is just a few lines of codes away before you come up with a quine generator that turns a given perl script into a quine. Note this quine generator itself is a quine.
cf. http://blog.livedoor.jp/dankogai/archives/51519405.html
{local$_=q{
{
package Quine;
use strict;
use warnings;
our $VERSION = sprintf "%d.%02d", q$Revision: 0.2 $ =~ /(\d+)/g;
my $head = '{local$_=q' . "\x7B\n";
my $tail = 'print"{local\$_=q{$_};eval}\n"' . "\x7D;eval}\n";
sub new {
my $class = shift;
my $quine = $head . shift;
my $ret = shift || 1;
my $ln = ( $quine =~ tr/\n/\n/ );
$ln++;
$quine .= "return $ret if caller(1)or(caller)[2]!=$ln;$tail";
bless \$quine, $class;
}
sub from_file {
my ( $class, $fn, $ret ) = @_;
local $/;
open my $fh, '<', $fn or die "$fn : $!";
my $src = <$fh>;
close $fh;
$class->new( $src, $ret );
}
sub quine { ${ $_[0] } }
=head1 NAME
Quine - turn your perl modules/apps into a true quine!
=head1 VERSION
$Id: Quine.pm,v 0.2 2010/09/15 20:23:53 dankogai Exp dankogai $
=head1 SYNOPSIS
use Quine;
print Quine->from_file("woot.pl")->quine;
print Quine->from_file("moot.psgi", '$app')->quine;
=cut
}
return 1 if caller(1);print"{local\$_=q{$_};eval}\n"};eval}
Phix
Credit: Aidan Bindoff
constant c="constant c=%sprintf(1,c,{34&c&34})"printf(1,c,{34&c&34})
PHP
<?php $p = '<?php $p = %c%s%c; printf($p,39,$p,39); ?>
'; printf($p,39,$p,39); ?>
Note the terminating newline.
Technically, anything outside of <?php
, <script language="php">
, <?
(deprecated) or <%
(deprecated) tags is automatically echoed by PHP allowing for easier inclusion of HTML in PHP documents. So the following is a quine:
Rosetta code :).
PicoLisp
Using 'quote'
Note that 'quote' in PicoLisp corresponds to 'lambda' in other Lisps
('((X) (list (lit X) (lit X))) '((X) (list (lit X) (lit X))))
- Output:
-> ('((X) (list (lit X) (lit X))) '((X) (list (lit X) (lit X))))
Using 'let'
(let X '(list 'let 'X (lit X) X) (list 'let 'X (lit X) X))
- Output:
-> (let X '(list 'let 'X (lit X) X) (list 'let 'X (lit X) X))
PL/I
The following code, containing 709 significant bytes, compiles completely clean using the old MVS PL/I V2.3.0 Compiler, using the default 2,72,1 margins:
s:proc options(main)reorder;dcl sysprint file,m(7)init(
' s:proc options(main)reorder\dcl sysprint file,m(7)init(',
' *)char(99),i,j,(translate,substr)builtin,c char\i=1\j=n',
' \do i=1 to 6\put skip list('' '''''')\do j=2 to 56\c=substr',
' (m(i),j)\put edit(c)(a)\n:proc\put list(translate(m(i),',
' ''5e''x,''e0''x))\end n\if c='''''''' then put edit(c)(a)\end\ ',
' put edit('''''','')(a(50))\end\do i=2 to 6\j=n\end\end s\ ',
*)char(99),i,j,(translate,substr)builtin,c char;i=1;j=n
;do i=1 to 6;put skip list(' ''');do j=2 to 56;c=substr
(m(i),j);put edit(c)(a);n:proc;put list(translate(m(i),
'5e'x,'e0'x));end n;if c='''' then put edit(c)(a);end;
put edit(''',')(a(50));end;do i=2 to 6;j=n;end;end s;
An even smaller version (believed to be the smallest possible PL/I Quine), containing 326 significant bytes, shows the unique capabilities of the same old V2.3.0 compiler in being able to generate correct code, ovecoming 2 pre-processor errors, 8 severe errors, 10 errors, 6 warnings and 2 informational messages. It requires the following non-default compile options, 'M,MAR(1,90),C'.
%dcl z%z='put edit';proc options(main;q=''''put list(m;do i=1,2;z(q)skip;do j=
1to 78c=substr(m(i),j;if c=q z(c;z(c;end;z(q',';dcl(c,q)char,m(2)char(99)init(
'%dcl z%z=''put edit'';proc options(main;q=''''''''put list(m;do i=1,2;z(q)skip;do j=',
'1to 78c=substr(m(i),j;if c=q z(c;z(c;end;z(q'','';dcl(c,q)char,m(2)char(99)init(',
The equivalent version that compiles with the newer z/OS Enterprise PL/I compilers, coming in at 434 significant bytes and requiring the following two compiler options, 'm,margins(1,80,0)', is:
%dcl z;%z="put edit";w:proc options(main);q="'";put list(m)do i=1,2,3;z
(q)(a)skip;do j=1to 71;c=substr(m(i),j)if c=q then z(c)(a)z(c)(a)end;if
i<3then z(q,",")(a)else z(q,";")(a)end;dcl(c,q)char,m(3)char(99)init(
'%dcl z;%z="put edit";w:proc options(main);q="''";put list(m)do i=1,2,3;z',
'(q)(a)skip;do j=1to 71;c=substr(m(i),j)if c=q then z(c)(a)z(c)(a)end;if',
'i<3then z(q,",")(a)else z(q,";")(a)end;dcl(c,q)char,m(3)char(99)init( ';
Plain TeX
Output to terminal
This assumes the filename of the source file to be ‘q.tex’, and the banner from vanilla Knuth’s TeX:
This is TeX, Version 3.1415926 (no format preloaded)
(q.tex \output {\message {\output \the \output \end }\batchmode }\end
Output to dvi
\let~\expandafter\def\0{~\ttraggedright~\let~\s~\string~\def[[User:Wodan58|Wodan58]] ([[User talk:Wodan58|talk]]){~\s[[User:Wodan58|Wodan58]] ([[User talk:Wodan58|talk]])\s~}~\output~
~{~}~\s~\let[[User:Wodan58|Wodan58]] ([[User talk:Wodan58|talk]])\expandafter~\s~\def~\s~\0~\s~{~\0~\s~}~\s~\0~\end}\0
Pony
actor Main
new create(env: Env) =>
let a = """env.out.print("actor Main\nnew create(env: Env) =>\nlet a = \"\"\""+a+"\"\"\"\n"+a)"""
env.out.print("actor Main\nnew create(env: Env) =>\nlet a = \"\"\""+a+"\"\"\"\n"+a)
PowerBASIC
This is technically based on the BASIC code above, but is in fact a complete rewrite.
FUNCTION PBMAIN () AS LONG
REDIM s(1 TO DATACOUNT) AS STRING
o$ = READ$(1)
d$ = READ$(2)
FOR n& = 1 TO DATACOUNT
s(n&) = READ$(n&)
NEXT
OPEN o$ FOR OUTPUT AS 1
FOR n& = 3 TO DATACOUNT - 1
PRINT #1, s(n&)
NEXT
PRINT #1,
FOR n& = 1 TO DATACOUNT
PRINT #1, d$ & $DQ & s(n&) & $DQ
NEXT
PRINT #1, s(DATACOUNT)
CLOSE
DATA "output.src"
DATA " DATA "
DATA "FUNCTION PBMAIN () AS LONG"
DATA " REDIM s(1 TO DATACOUNT) AS STRING"
DATA " o$ = READ$(1)"
DATA " d$ = READ$(2)"
DATA " FOR n& = 1 TO DATACOUNT"
DATA " s(n&) = READ$(n&)"
DATA " NEXT"
DATA " OPEN o$ FOR OUTPUT AS 1"
DATA " FOR n& = 3 TO DATACOUNT - 1"
DATA " PRINT #1, s(n&)"
DATA " NEXT"
DATA " PRINT #1,"
DATA " FOR n& = 1 TO DATACOUNT"
DATA " PRINT #1, d$ & $DQ & s(n&) & $DQ"
DATA " NEXT"
DATA " PRINT #1, s(DATACOUNT)"
DATA " CLOSE"
DATA "END FUNCTION"
END FUNCTION
PowerShell
Adapted from Liberty BASIC.
$S = '$S = $S.Substring(0,5) + [string][char]39 + $S + [string][char]39 + [string][char]10 + $S.Substring(5)'
$S.Substring(0,5) + [string][char]39 + $S + [string][char]39 + [string][char]10 + $S.Substring(5)
- Output:
$S = '$S = $S.Substring(0,5) + [string][char]39 + $S + [string][char]39 + [string][char]10 + $S.Substring(5)' $S.Substring(0,5) + [string][char]39 + $S + [string][char]39 + [string][char]10 + $S.Substring(5)
Variations to access the code directly
In a saved script
$MyInvocation.MyCommand.ScriptContents
At the command line
$MyInvocation.MyCommand.Definition
In a function
function Quine { $MyInvocation.MyCommand.Definition }
Processing
Console with immediate mode
A simple one-liner in Processing prints itself to the console.
String p="String p=%c%s%1$c;System.out.printf(p,34,p);";System.out.printf(p,34,p);
This takes advantage of the fact that Processing does not require a wrapping class or main method (unlike the Java it is based on). Further, Processing "immediate mode" without setup() or draw() methods does not require a method or function at all, and instead can compile and run direct commands. Processing normally uses "print", and calling the undocumented "System.out.printf" from Java is not idiomatic. However that is used here because it gives easy access to string templating. In printf(p,34,p) the template p is passed two arguments: 34 is inserted into %c and the back-reference %1$c, where they each become an ASCII quote character, while p (itself) is inserted at %s.
Graphical output
One of the most common uses of Processing is to draw to the screen and render images, including text with rendered fonts. A more complex Processing quine correctly renders its source code on the canvas and saves the frame image of its source to an image file.
int o=12,i=0;
void setup(){size(480,240);noLoop();}void draw(){background(0);
String[] c = {
"int o=12;i=0",
"void setup(){size(480,240);noLoop();}void draw(){background(0);",
" String[] c = {",
" };",
" for(;i<3;i++)text(c[i],o,o*(i+1));",
" for(;i<9;i++)text(c[i],o,o*(i+10));",
" for(i=0;i<9;i++)text(char(34)+c[i]+char(34)+',',o*3,o*(i+1+3));",
" saveFrame();",
"}",
};
for(;i<3;i++)text(c[i],o,o*(i+1));
for(;i<9;i++)text(c[i],o,o*(i+10));
for(i=0;i<9;i++)text(char(34)+c[i]+char(34)+',',o*3,o*(i+1+3));
saveFrame();
}
The code uses a line offset o of 12px for laying out lines of text using the default 10px white font. It reuses a global int i across all three loops to save a bit of space and to take advantage of non-linear drawing to the screen: the outer lines 0-3 and 4-9 are drawn in the first and second loops without resetting i, then the inner lines 0-9 are drawn between them in the third loop.
Prog8
Lacking a convenient way to print a quoted string with embedded newlines replaced by \n, I went with an array of lines.
%import textio
main {
sub start() { str[] s = [
"%import textio","main {","sub start() { str[] s = [","]","ubyte i","for i in 0 to 2 { txt.print(s[i]) txt.nl() }","for i in 0 to 8 { txt.chrout(34) txt.print(s[i]) txt.chrout(34) if i<8 txt.chrout(44) }","for i in 3 to 8 { txt.print(s[i]) txt.nl() } }","}"]
ubyte i
for i in 0 to 2 { txt.print(s[i]) txt.nl() }
for i in 0 to 8 { txt.chrout(34) txt.print(s[i]) txt.chrout(34) if i<8 txt.chrout(44) }
for i in 3 to 8 { txt.print(s[i]) txt.nl() } }
}
Prolog
One method to produce a quine is to read the data structures that hold the source code:
quine :-
listing(quine).
Producing a quine without cheating is more complex. The following program produces a data structure equivalent to the program itself, then outputs it:
quine:-asserta(a((quine:-asserta(a(A,B)),a(C,D+E),a(D,E),numbervars(C),write(C),write(.)),A+B)),a(F,G+H),a(G,H),numbervars(F),write(F),write(.).
The use of numbervars is a GNU Prolog extension that fixes the variable names in the output to be single letters, in alphabetical order by appearance, and thus match the original program. Removing it, the quine still works, but the variable names in the output will probably be different; thus, it will produce a program equivalent to itself, rather than an exact copy of itself.
A version that is source-code-centric rather than AST-centric, and does not rely on any built-in facilities for formatted printing, might look as follows:
% Tested with SWI-Prolog version 7.1.37
:- initialization(main).
before(Lines) :- Lines = [
"% Tested with SWI-Prolog version 7.1.37",
":- initialization(main).",
"",
"before(Lines) :- Lines = ["
].
after(Lines) :- Lines = [
"].",
"",
"% replaces quotes by harmless ats",
"% replaces backslashes by harmless slashes",
"% replaces linebreaks by harmless sharps",
"maskCode(34, 64).",
"maskCode(92, 47).",
"maskCode(10, 35).",
"maskCode(X, X).",
"",
"% Encodes dangerous characters in a string",
"encode(D, S) :- ",
" string_codes(D, DC),",
" maplist(maskCode, DC, SC),",
" string_codes(S, SC).",
"",
"decode(S, D) :- ",
" string_codes(S, SC),",
" maplist(maskCode, DC, SC),",
" string_codes(D, DC).",
"",
"% writes each entry indented by two spaces,",
"% enclosed in quotes and separated by commas,",
"% with a newline between the list entries.",
"mkStringList([],@@).",
"mkStringList([Single],Out) :-",
" atomics_to_string([@ /@@, Single, @/@@], Out).",
"",
"mkStringList([H|T], Res) :-",
" mkStringList(T, TailRes),",
" atomics_to_string([@ /@@, H, @/@,/n@, TailRes], Res).",
"",
"quine(Q) :- ",
" before(BeforeEncoded),",
" after(AfterEncoded),",
" maplist(decode, BeforeEncoded, BeforeDecoded),",
" maplist(decode, AfterEncoded, AfterDecoded),",
" atomic_list_concat(BeforeDecoded, @/n@, B),",
" atomic_list_concat(AfterDecoded, @/n@, A),",
" mkStringList(BeforeEncoded, BeforeData),",
" mkStringList(AfterEncoded, AfterData),",
" Center = @/n]./n/nafter(Lines) :- Lines = [/n@,",
" atomic_list_concat([",
" B, @/n@, BeforeData, ",
" Center, ",
" AfterData, @/n@, A, @/n@",
" ], Q).",
"",
"main :- (quine(Q), write(Q);true),halt.",
"% line break in the end of file is important"
].
% replaces quotes by harmless ats
% replaces backslashes by harmless slashes
% replaces linebreaks by harmless sharps
maskCode(34, 64).
maskCode(92, 47).
maskCode(10, 35).
maskCode(X, X).
% Encodes dangerous characters in a string
encode(D, S) :-
string_codes(D, DC),
maplist(maskCode, DC, SC),
string_codes(S, SC).
decode(S, D) :-
string_codes(S, SC),
maplist(maskCode, DC, SC),
string_codes(D, DC).
% writes each entry indented by two spaces,
% enclosed in quotes and separated by commas,
% with a newline between the list entries.
mkStringList([],"").
mkStringList([Single],Out) :-
atomics_to_string([" \"", Single, "\""], Out).
mkStringList([H|T], Res) :-
mkStringList(T, TailRes),
atomics_to_string([" \"", H, "\",\n", TailRes], Res).
quine(Q) :-
before(BeforeEncoded),
after(AfterEncoded),
maplist(decode, BeforeEncoded, BeforeDecoded),
maplist(decode, AfterEncoded, AfterDecoded),
atomic_list_concat(BeforeDecoded, "\n", B),
atomic_list_concat(AfterDecoded, "\n", A),
mkStringList(BeforeEncoded, BeforeData),
mkStringList(AfterEncoded, AfterData),
Center = "\n].\n\nafter(Lines) :- Lines = [\n",
atomic_list_concat([
B, "\n", BeforeData,
Center,
AfterData, "\n", A, "\n"
], Q).
main :- (quine(Q), write(Q);true),halt.
% line break in the end of file is important
It could be made shorter. This version contains some introns that have been used for code generation (like the encode/2 predicate, that is not really needed).
Using format/2 predicate:
main:-X='main:-X=~q,format(X,X).',format(X,X).
PureBasic
s$="s$= : Debug Mid(s$,1,3)+Chr(34)+s$+Chr(34)+Mid(s$,4,100)" : Debug Mid(s$,1,3)+Chr(34)+s$+Chr(34)+Mid(s$,4,100)
Python
A simple and straightforward quine. Character chr(34) is a double quote, and chr(10) is a new line (Author: J. C. Lucero).
w = "print('w = ' + chr(34) + w + chr(34) + chr(10) + w)"
print('w = ' + chr(34) + w + chr(34) + chr(10) + w)
Python's %r format conversion uses the repr() function to return a string containing the source code representation of its argument:
x = 'x = %r\nprint(x %% x)'
print(x % x)
With the new str.format:
x = 'x = {!r};print(x.format(x))';print(x.format(x))
After creating the file "Quine.py" with the following source, running the program will spit the code back out on a terminal window:
import sys; sys.stdout.write(open(sys.argv[0]).read())
Note: actually an empty file could be treated as python quine too.
import sys,inspect;sys.stdout.write(inspect.getsource(inspect.currentframe()))
A simple implementation that uses exec, an f-string, and the walrus operator.
exec(c:="print(f'exec(c:={chr(34)+c+chr(34)})')")
Due to Leon Naley (name guessed) from devshed python forum
I think I just thought of the shortest quine for python I think there can ever be! (except a blank program)
make a program with this single line in it
print(__file__[:-3])
and name the file print(__file__[:-3]).py
and run the file!
bash example command:
$ python print\(__file__\[\:-3\]\).py
print(__file__[:-3])
Python 3, from same thread at same forum, created by wewhgyih, tested by LambertDW. Works on unix and Windows7. On Windows7 I commanded python "print(__file__)" .
$ cat print\(__file__\)
print(__file__)
$ python print\(__file__\)
print(__file__)
I saw this clever solution somewhere some time ago (dont' remember the source.) Assuming the input does not have to be a correct program...
$ cat reproducing.py
File "reproducing.py", line 1
File "reproducing.py", line 1
^
IndentationError: unexpected indent
$ python reproducing.py
File "reproducing.py", line 1
File "reproducing.py", line 1
^
IndentationError: unexpected indent
Here's a few by me (Nathaniel Virgo). They represent attempts to make clean, readable "Pythonic" quines. The first one is straightforward, using format and chr(34) to construct a multiline string:
x = """x = {0}{1}{0}
print x.format(chr(34)*3,x)"""
print x.format(chr(34)*3,x)
This next one uses a base64 encoding, which is an off-the-shelf way to pack strings containing quotes and newlines etc. into ones that consist only of printable characters. Python purists will probably tell me I should have used the base64 package instead.
a = 'YSA9ICcnCmIgPSBhLmRlY29kZSgnYmFzZTY0JykKcHJpbnQgYls6NV0rYStiWzU6XQ=='
b = a.decode('base64')
print b[:5]+a+b[5:]
In the above quine I felt it was inelegant to hard code the insertion of the data after the 5th character and I wondered if I could do it in a cleaner way. Eventually I came up with this:
data = (
'ZGF0YSA9ICgKCSc=',
'JywKCSc=',
'JwopCnByZWZpeCwgc2VwYXJhdG9yLCBzdWZmaXggPSAoZC5kZWNvZGUoJ2Jhc2U2NCcpIGZvciBkIGluIGRhdGEpCnByaW50IHByZWZpeCArIGRhdGFbMF0gKyBzZXBhcmF0b3IgKyBkYXRhWzFdICsgc2VwYXJhdG9yICsgZGF0YVsyXSArIHN1ZmZpeA=='
)
prefix, separator, suffix = (d.decode('base64') for d in data)
print prefix + data[0] + separator + data[1] + separator + data[2] + suffix
Finally, here's one that echoes the classic "Y combinator" way of constructing quines. First we define a function that takes some code, wraps it in a function and then applies than function to its own source code, then we apply *that* function to its own source code:
def applyToOwnSourceCode(functionBody):
print "def applyToOwnSourceCode(functionBody):"
print functionBody
print "applyToOwnSourceCode(" + repr(functionBody) + ")"
applyToOwnSourceCode('\tprint "def applyToOwnSourceCode(functionBody):"\n\tprint functionBody\n\tprint "applyToOwnSourceCode(" + repr(functionBody) + ")"')
Quackery
Using the Quackery decompiler, build.
[ ' [ ' unbuild dup 4 split rot space rot 3 times join echo$ ] unbuild dup 4 split rot space rot 3 times join echo$ ]
- Output:
[ ' [ ' unbuild dup 4 split rot space rot 3 times join echo$ ] unbuild dup 4 split rot space rot 3 times join echo$ ]
Using self reference, and the decompiler built into echo.
[ this echo ]
- Output:
[ this echo ]
R
Adapted from the C version in this list.
(function(){x<-intToUtf8(34);s<-"(function(){x<-intToUtf8(34);s<-%s%s%s;cat(sprintf(s,x,s,x))})()";cat(sprintf(s,x,s,x))})()
Another version, perhaps more understandable.
src <- "\nwriteLines(c(paste(\"src <-\", encodeString(src, quote='\"')), src))"
writeLines(c(paste("src <-", encodeString(src, quote='"')), src))
Racket
The classic:
((λ (x) `(,x ',x)) '(λ (x) `(,x ',x)))
As a module:
(module quine racket
(pretty-write
((λ (x) `(module quine racket (pretty-write (,x ',x))))
'(λ (x) `(module quine racket (pretty-write (,x ',x)))))))
As a module via #lang line:
#lang racket
((λ(x)(printf "#lang racket\n(~a\n ~s)" x x))
"(λ(x)(printf \"#lang racket\\n(~a\\n ~s)\" x x))")
Raku
(formerly Perl 6)
my &f = {say $^s, $^s.raku;}; f "my \&f = \{say \$^s, \$^s.raku;}; f "
Note the terminating newline.
A more compact, but still purely functional, approach:
{.fmt($_).say}(<{.fmt($_).say}(<%s>)>)
Note again the terminating newline.
REBOL
rebol [] q: [print ["rebol [] q:" mold q "do q"]] do q
REXX
version 1
/*REXX program outputs its own 1─line source.*/ say sourceline(1)
- output:
/*REXX program outputs its own 1─line source.*/ say sourceline(1)
version 2
/*REXX program outputs its own multi─line source.*/
do j=1 for sourceline()
say sourceline(j)
end /*j*/
- output:
/*REXX program outputs its own multi─line source.*/ do j=1 for sourceline() say sourceline(j) end /*j*/
version 3
A version that doesn't use sourceline()
which is kind of a cheat.
---But it is allowed (see the 2nd bullet point in the task's preamble).
Error?
The rest of this conversation moved to Talk
/* Rexx */
Q = "'"
Queue '/* Rexx */'
Queue ''
Queue 'Q = "$"'
Queue '&QQQ'
Queue ''
Queue 'X = 0'
Queue 'Do while Queued() \= 0'
Queue ' Parse pull code'
Queue ' X = X + 1; codel.0 = X; codel.X = code'
Queue ' End'
Queue ''
Queue 'Do x_ = 1 for codel.0'
Queue ' line = codel.x_'
Queue ' If abbrev(line, "Q = ") then Do'
Queue ' line = translate(line, Q, "$")'
Queue ' End'
Queue ' If line = "&QQQ" then Do'
Queue ' Do y_ = 1 to codel.0'
Queue ' qline = codel.y_'
Queue ' Say "Queue" Q || qline || Q'
Queue ' End y_'
Queue ' End'
Queue ' else Do'
Queue ' Say line'
Queue ' End'
Queue ' End x_'
Queue ''
X = 0
Do while Queued() \= 0
Parse pull code
X = X + 1; codel.0 = X; codel.X = code
End
Do x_ = 1 for codel.0
line = codel.x_
If abbrev(line, "Q = ") then Do
line = translate(line, Q, "$")
End
If line = "&QQQ" then Do
Do y_ = 1 to codel.0
qline = codel.y_
Say "Queue" Q || qline || Q
End y_
End
else Do
Say line
End
End x_
Ring
v = "see substr(`v = ` + char(34) + `@` + char(34) + nl + `@` ,`@`,v)"
see substr(`v = ` + char(34) + `@` + char(34) + nl + `@` ,`@`,v)
RPL
RPL programs are stored in RAM as a specific data structure, and can then be recalled the same way as an ordinary variable.
≪ 'QUINE' RCL ≫ 'QUINE' STO
QUINE
- Output:
1: ≪ '<span style="color:blue">QUINE</span>' RCL ≫
Without self-reference
The call is less idiomatic but still valid.
≪ LASTARG RCL ≫
'QUINE' STO
'QUINE' EVAL
- Output:
1: ≪ LASTARG RCL ≫
Ruby
Found online:
_="_=%p;puts _%%_";puts _%_
A shell session demonstrating that it is valid:
$ ruby -e '_="_=%p;puts _%%_";puts _%_' _="_=%p;puts _%%_";puts _%_ $ ruby -e '_="_=%p;puts _%%_";puts _%_' | ruby _="_=%p;puts _%%_";puts _%_
A more readable version of the above example:
x = "x = %p; puts x %% x"; puts x % x
The %p
specifier outputs the result of calling the .inspect
method on the argument.
Even shorter (by a few characters):
puts <<e*2,'e'
puts <<e*2,'e'
e
Perhaps the simplest:
eval s="puts'eval s='+s.inspect"
An implementation that reads and prints the file the code is stored in (which violates some definitions of “quine”):
puts open(__FILE__).read
As the above implementation depends on the code being saved in a file, it doesn’t work in IRB.
Rust
A short quine (works with Rust 1.3.0):
fn main() {
let x = "fn main() {\n let x = ";
let y = "print!(\"{}{:?};\n let y = {:?};\n {}\", x, x, y, y)\n}\n";
print!("{}{:?};
let y = {:?};
{}", x, x, y, y)
}
Using the method on Wikipedia (0.9-pre-compatible, does not compile on Rust 1.0.0 and newer):
fn main()
{
let q = 34u8;
let p = 44u8;
let l = [
"fn main()",
"{",
" let q = 34u8;",
" let p = 44u8;",
" let l = [",
" ",
" ];",
" let mut i = 0;",
" while i < 5",
" {",
" println(l[i]);",
" i+=1;",
" }",
" i = 0;",
" while i < l.len()",
" {",
" print(l[5]);",
" print((q as char).to_str());",
" print(l[i]);",
" print((q as char).to_str());",
" println((p as char).to_str());",
" i+=1;",
" }",
" i = 6;",
" while i < l.len()",
" {",
" println(l[i]);",
" i+=1;",
" }",
"}",
];
let mut i = 0;
while i < 5
{
println(l[i]);
i+=1;
}
i = 0;
while i < l.len()
{
print(l[5]);
print((q as char).to_str());
print(l[i]);
print((q as char).to_str());
println((p as char).to_str());
i+=1;
}
i = 6;
while i < l.len()
{
println(l[i]);
i+=1;
}
}
A quine in the shape of a circle:
fn main(){let q:&[u8]=&[
32,00,00,00,00,00,00,00,61,27,80,82,
73,78,84,76,78,01,08,02,91,93,70,78,00,77,65,73,78,08,
09,91,91,76,69,84,00,81,26,06,59,85,24,61,29,06,59,02,12,00,51,84,
82,73,78,71,26,26,70,82,79,77,63,85,84,70,24,08,86,69,67,01,59,66,07,00,
07,27,00,21,20,61,09,14,85,78,87,82,65,80,08,09,09,27,76,69,84,00,82,29,08,81,
14,76,69,78,08,09,65,83,00,70,22,20,15,83,84,68,26,26,70,22,20,32,00,00,00,00,00,00,00,00,
00,26,26,67,79,78,83,84,83,26,26,48,41,09,14,83,81,82,84,08,09,65,83,00,73,19,18,11,20,27,76,69,
84,00,77,85,84,00,66,26,00,54,69,67,28,08,73,19,18,12,00,73,19,18,09,00,30,29,00,54,69,67,26,26,
78,69,87,08,09,27,00,15,10,00,00,00,79,79,69,82,00,00,10,15,00,76,69,84,00,77,85,84,00,88,29,82,13,17,
27,00,76,69,84,00,77,85,84,00,89,29,16,27,32,00,00,00,00,00,00,00,00,00,00,76,69,84,00,77,85,84,00,75,29,17,
27,76,69,84,00,77,85,84,00,74,29,17,27,76,69,84,00,77,85,84,00,69,29,75,00,13,08,82,28,28,17,09,27,87,72,73,76,69,
00,88,30,29,89,91,66,14,80,85,83,72,08,08,82,11,88,12,82,11,89,09,09,27,66,14,80,85,83,72,08,08,82,11,89,12,82,11,
88,09,09,27,00,66,14,80,85,83,72,08,08,82,13,89,12,82,11,88,09,32,00,00,00,00,00,00,00,00,00,00,00,00,00,09,27,66,14,80,
85,83,72,08,08,82,13,88,12,00,82,11,89,09,09,27,66,14,80,85,83,72,08,08,82,13,88,12,82,13,89,09,09,27,66,14,80,85,83,72,
08,08,82,13,89,12,82,13,88,09,09,27,00,66,14,80,85,83,72,08,08,82,11,89,12,82,13,88,09,09,27,66,14,80,85,83,72,08,08,82,
11,88,12,82,13,89,09,09,27,00,73,70,00,69,28,29,16,91,32,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,89,11,29,17,27,69,11,
29,74,27,74,11,29,18,27,93,73,70,00,69,30,16,00,91,88,13,29,17,27,75,11,29,18,27,69,11,29,75,13,08,82,28,28,17,09,27,93,93,76,
69,84,00,77,85,84,00,84,29,81,14,73,84,69,82,08,09,27,07,79,26,70,79,82,00,89,00,73,78,00,17,14,14,82,10,18,00,91,00,76,69,84,
00,76,26,00,54,69,67,32,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,28,73,19,18,30,00,29,00,66,14,73,84,69,82,08,
09,14,70,73,76,84,69,82,08,92,88,92,00,88,14,17,29,29,89,09,14,77,65,80,08,92,88,92,00,88,14,16,09,14,67,79,76,76,69,67,84,08,
09,27,00,76,69,84,00,88,00,29,00,76,14,73,84,69,82,08,09,14,67,76,79,78,69,68,08,09,14,70,79,76,68,08,16,12,32,00,00,00,00,00,
00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,73,19,18,26,26,77,65,88,09,27,00,76,69,84,00,78,00,29,76,14,73,84,69,82,08,09,
14,67,76,79,78,69,68,08,09,14,70,79,76,68,08,25,25,25,12,00,73,19,18,26,26,77,73,78,09,27,76,69,84,00,77,29,88,13,78,27,00,70,
79,82,00,63,00,73,78,00,16,14,14,78,00,91,00,80,82,73,78,84,01,32,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,
00,00,00,00,08,02,00,00,00,02,09,27,93,70,79,82,00,63,00,73,78,00,16,14,14,77,91,00,73,70,00,76,69,84,00,51,79,77,69,08,86,09,
00,29,00,84,14,78,69,88,84,08,09,00,91,80,82,73,78,84,01,08,02,91,26,16,18,93,12,02,12,86,09,27,93,00,69,76,83,69,91,00,66,82,
69,65,75,32,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,07,79,27,00,93,93,00,80,82,73,
78,84,01,08,02,60,78,02,09,27,00,93,00,70,79,82,00,78,00,73,78,00,81,14,73,84,69,82,08,09,00,91,00,80,82,73,78,84,01,08,02,91,
93,02,12,00,08,73,70,00,10,78,29,29,19,18,91,17,16,93,00,69,76,83,69,32,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,
00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,91,10,78,11,19,18,93,09,00,65,83,00,67,72,65,82,09,27,93,80,82,73,
78,84,01,08,02,60,78,02,09,27,93,00,15,15,00,71,73,84,72,85,66,14,67,79,77,15,75,73,82,74,65,86,65,83,67,82,73,80,84,
];println!("{}fn main(){{let q:&[u8]=&[", String::from_utf8(vec![b' '; 54]).unwrap());let r=(q.len()as f64/std::f64
::consts::PI).sqrt()as i32+4;let mut b: Vec<(i32, i32) >= Vec::new(); /* ooer */ let mut x=r-1; let mut y=0;
let mut k=1;let mut j=1;let mut e=k -(r<<1);while x>=y{b.push((r+x,r+y));b.push((r+y,r+x)); b.push((r-y,r+x)
);b.push((r-x, r+y));b.push((r-x,r-y));b.push((r-y,r-x)); b.push((r+y,r-x));b.push((r+x,r-y)); if e<=0{
y+=1;e+=j;j+=2;}if e>0 {x-=1;k+=2;e+=k-(r<<1);}}let mut t=q.iter();'o:for y in 1..r*2 { let l: Vec
<i32> = b.iter().filter(|x| x.1==y).map(|x| x.0).collect(); let x = l.iter().cloned().fold(0,
i32::max); let n =l.iter().cloned().fold(999, i32::min);let m=x-n; for _ in 0..n { print!
(" ");}for _ in 0..m{ if let Some(v) = t.next() {print!("{:02},",v);} else{ break
'o; }} print!("\n"); } for n in q.iter() { print!("{}", (if *n==32{10} else
{*n+32}) as char);}print!("\n");} // github.com/kirjavascript
From Reddit (works in Rust 1.59.0)
fn main() {
macro_rules! script {() => {"fn main() {{\n\tmacro_rules! script {{() => {{{:?}}}}}\n\tprintln!(script!(), script!());\n}}"}}
println!(script!(), script!());
}
Scala
script:
val q = "\"" * 3
val c = """val q = "\"" * 3
val c = %s%s%s
println(c format (q, c, q))
"""
println(c format (q, c, q))
application:
object Quine {
def main(args: Array[String]) {
val q = "\"" * 3
val c = """object Quine {
def main(args: Array[String]) {
val q = "\"" * 3
val c = %s%s%s
println(c format (q, c, q))
}
}"""
println(c format (q, c, q))
}
}
script, using printf with indexed arguments (proposed here: http://www.codecommit.com/blog/scala/useless-hackery-a-scala-quine):
val x="val x=%c%s%1$c;printf(x,34,x)";printf(x,34,x)
Scheme
((lambda (s) (display (list s (list (quote quote) s)))) (quote (lambda (s) (display (list s (list (quote quote) s))))))
or more "directly" (and classically)
((lambda (q) (quasiquote ((unquote q) (quote (unquote q))))) (quote (lambda (q) (quasiquote ((unquote q) (quote (unquote q)))))))
which is a long-hand for "cute"
((lambda (q) `(,q ',q)) '(lambda (q) `(,q ',q)))
Seed7
$ include "seed7_05.s7i";
const array string: prog is [](
"$ include \"seed7_05.s7i\";",
"const array string: prog is [](",
"const proc: main is func",
" local var integer: number is 0;",
" begin",
" for number range 1 to 2 do writeln(prog[number]); end for;",
" for number range 1 to 11 do",
" writeln(literal(prog[number]) <& \",\");",
" end for;",
" writeln(literal(prog[12]) <& \");\");",
" for number range 3 to 12 do writeln(prog[number]); end for;",
" end func;");
const proc: main is func
local var integer: number is 0;
begin
for number range 1 to 2 do writeln(prog[number]); end for;
for number range 1 to 11 do
writeln(literal(prog[number]) <& ",");
end for;
writeln(literal(prog[12]) <& ");");
for number range 3 to 12 do writeln(prog[number]); end for;
end func;
Original source: [1]
Shale
i var i "i var i %c%s%c = 34 i 34 i printf" = 34 i 34 i printf
Sidef
With printf():
s = %(s = %%(%s); printf(s, s);
); printf(s, s);
With HERE-doc:
say(<<e*2, 'e')
say(<<e*2, 'e')
e
Smalltalk
(newline included)
[:s| Transcript show: s, s printString; cr ] value: '[:s| Transcript show: s, s printString; cr ] value: '
(newline included)
' print; displayNl' print; displayNl
SmileBASIC
Fairly standard with a format string and character codes.
Q$="Q$=%SPRINT FORMAT$(Q$,CHR$(34)+Q$+CHR$(34)+CHR$(10))"
PRINT FORMAT$(Q$,CHR$(34)+Q$+CHR$(34)+CHR$(10))
SNOBOL4
S = ' OUTPUT = " S = 0" S "0"; OUTPUT = REPLACE(S,+"","0");END'
OUTPUT = " S = '" S ""; OUTPUT = REPLACE(S,+"","'");END
SPL
There is a bootstrapper for a Quine in SPL. The actual Quine is quite large (3.1 million to 180 thousand lines in this case).
SPWN
d='JC5wcmludCgiZD0nIitkKyInOyIrJC5iNjRkZWNvZGUoZCkp';$.print("d='"+d+"';"+$.b64decode(d))
Standard ML
(newline included)
(fn s => print (s ^ "\"" ^ String.toString s ^ "\";\n")) "(fn s => print (s ^ \"\\\"\" ^ String.toString s ^ \"\\\";\\n\")) ";
(without newline)
(fn y=>(fn x=>(print(x^y^x^y)))) (implode[chr(34)])"(fn y=>(fn x=>(print(x^y^x^y)))) (implode[chr(34)])"
Swift
Version 1
(newline included)
({print($0+$0.debugDescription+")")})("({print($0+$0.debugDescription+\")\")})(")
(newline included)
{println($0+$0.debugDescription+")")}("{println($0+$0.debugDescription+\")\")}(")
Version 2
(newline included)
let x = ["let x =", ";print(x[0], x, x[1])"] ;print(x[0], x, x[1])
based on the above (passes swift-format):
let x = ["let x = ", "\nprint(x[0], x, x[1], separator: String())"]
print(x[0], x, x[1], separator: String())
Tcl
There are a number of excellent quines in the Tcl wiki[2], the most useful for real-world programming probably the one that uses [info] to read the source of the currently running script. But that would be like opening its own source file.
The most straightforward one in the spirit of Quine is probably the one that uses [join], which appends the elements in the list given in its first argument with a "joining string" which is given in the second element of the list. For example the three-element list {} A B (the first element of which is an empty list):
join { {} A B } any_string
=> any_stringAany_stringB
If "A" and "B" are replaced by literal (i.e. escaped) opening and closing curled braces, the result becomes valid Tcl code:
join { {} \{ \} } something
=> something{something}
and re-assembling these parts with a connecting string that is exactly this operation of re-assembly:
join { {} \{ \} } { join { {} \{ \} } }
=> join { {} \{ \} } { join { {} \{ \} } }
Turbo Pascal
The following code was tested in Turbo Pascal 5.5 under DOSbox DOS, and using gpc 4.1. It assumes ASCII.
program quine;
const
apos: Char = Chr(39);
comma: Char = Chr(44);
lines: Array[1..17] of String[80] = (
'program quine;',
'',
'const',
' apos: Char = Chr(39);',
' comma: Char = Chr(44);',
' lines: Array[1..17] of String[80] = (',
' );',
'',
'var',
' num: Integer;',
'',
'begin',
' for num := 1 to 6 do writeln(lines[num]);',
' for num := 1 to 16 do writeln(apos, lines[num], apos, comma);',
'% writeln(apos, lines[17], apos);',
' for num := 7 to 17 do writeln(lines[num]);',
'end.'
);
var
num: Integer;
begin
for num := 1 to 6 do writeln(lines[num]);
for num := 1 to 16 do writeln(apos, lines[num], apos, comma);
writeln(apos, lines[17], apos);
for num := 7 to 17 do writeln(lines[num]);
end.
TXR
A suite for four variations on a theme. The first three use HTML encoding to avoid solving quoting problem. The third stops using
to encode newlines, but instead represents the coded portion of the program as a list of lines rather than a string containing newlines encoded in some other way. The fourth dispenses with the HTML crutch and solves the quoting problem with a filter defined in the program itself.
"double filtered"
@(deffilter me ("ME" "@(bind me "ME") @(output) @@(deffilter me ("ME" "@{me :filter me}")) @{me :filter (me :from_html)} @(end)"))
@(bind me "ME")
@(output)
@@(deffilter me ("ME" "@{me :filter me}"))
@{me :filter (me :from_html)}
@(end)
"straight up"
@(bind me "@(output) @@(bind me "@me") @{me :filter :from_html} @(end)")
@(output)
@@(bind me "@me")
@{me :filter :from_html}
@(end)
"code free"
@(bind me ("@(output)" "@@(bind me (@(rep)"@me" @(last)"@me"@(end)))" "@(repeat)" "@{me :filter :from_html}" "@(end)" "@(end)"))
@(output)
@@(bind me (@(rep)"@me" @(last)"@me"@(end)))
@(repeat)
@{me :filter :from_html}
@(end)
@(end)
"404"
@(bind me ("@(deffilter q (*'**'*' *'*/*'*') (*'**/*' *'*/*/*') (*'*****' *'***'))" "@(output)" "@@(bind me (@(rep)*'@me*' @(last)*'@me*'@(end)))" "@(repeat)" "@{me :filter q}" "@(end)" "@(end)"))
@(deffilter q ("*'" "\"") ("*/" "\\") ("**" "*"))
@(output)
@@(bind me (@(rep)"@me" @(last)"@me"@(end)))
@(repeat)
@{me :filter q}
@(end)
@(end)
UNIX Shell
A cheat that reads its own source code, because $0 is the path to the script:
#!/bin/sh
cat < "$0"
A cheat that reads its own input using the history command (only works in an interactive shell):
history | tail -n 1 | cut -c 8-
A real quine that doesn't cheat:
{
string=`cat`
printf "$string" "$string"
echo
echo END-FORMAT
} <<'END-FORMAT'
{
string=`cat`
printf "$string" "$string"
echo
echo END-FORMAT
} <<'END-FORMAT'
%s
END-FORMAT
Unlambda
``d`.v`.vv```s``si`k`ki``si`k`d`..`.``.d`.``.c`.s`.``.``.s`.``.``.vv``s``sc`d`.`v``s``sc`d`.`v``s``sc`d`.dv``s``sc`d`.`v``s``sc`d`..v``s``sc`d`.vv``s``sc`d`.`v``s``sc`d`..v``s``sc`d`.vv``s``sc`d`.vv``s``sc`d`.`v``s``sc`d`.`v``s``sc`d`.`v``s``sc`d`.sv``s``sc`d`.`v``s``sc`d`.`v``s``sc`d`.sv``s``sc`d`.iv``s``sc`d`.`v``s``sc`d`.kv``s``sc`d`.`v``s``sc`d`.kv``s``sc`d`.iv``s``sc`d`.`v``s``sc`d`.`v``s``sc`d`.sv``s``sc`d`.iv``s``sc`d`.`v``s``sc`d`.kv``s``sc`d`.`v``s``sc`d`.dv``s``sc`d`.`v``s``sc`d`..v``s``sc`d`..v``s``sc`d`.`v``s``sc`d`..v``s``sc`d`.`v``s``sc`d`.`v``s``sc`d`..v``s``sc`d`.dv``s``sc`d`.`v``s``sc`d`..v``s``sc`d`.`v``s``sc`d`.`v``s``sc`d`..v``s``sc`d`.cv``s``sc`d`.`v``s``sc`d`..v``s``sc`d`.sv``s``sc`d`.`v``s``sc`d`..v``s``sc`d`.`v``s``sc`d`.`v``s``sc`d`..v``s``sc`d`.`v``s``sc`d`.`v``s``sc`d`..v``s``sc`d`.sv``s``sc`d`.`v``s``sc`d`..v``s``sc`d`.`v``s``sc`d`.`v``s``sc`d`..v``s``sc`d`.`v``s``sc`d`.`v``s``sc`d`..v``s``sc`d`.vvv
Uxntal
|100
;q DUP2 print quine
BRK
@quine
LDAk DUP #04 SFT DUP #0a LTH ?{ #27 ADD } #30 ADD #18 DEO
#0f AND DUP #0a LTH ?{ #27 ADD } #30 ADD #18 DEO #2018 DEO
INC2 LDAk ?quine POP2
#3018 DEO #3018 DEO #0a18 DEO
JMP2r
@print
LDAk #18 DEO INC2 LDAk ?print POP2
JMP2r
@q 7c 31 30 30 0a 09 3b 71 20 44 55 50 32 20 70 72 69 6e 74 20 71 75 69 6e 65 0a 42 52 4b 0a 0a 40 71 75 69 6e 65 0a 09 4c 44 41 6b 20 44 55 50 20 23 30 34 20 53 46 54 20 44 55 50 20 23 30 61 20 4c 54 48 20 3f 7b 20 23 32 37 20 41 44 44 20 7d 20 23 33 30 20 41 44 44 20 23 31 38 20 44 45 4f 0a 09 23 30 66 20 41 4e 44 20 44 55 50 20 23 30 61 20 4c 54 48 20 3f 7b 20 23 32 37 20 41 44 44 20 7d 20 23 33 30 20 41 44 44 20 23 31 38 20 44 45 4f 20 23 32 30 31 38 20 44 45 4f 0a 09 49 4e 43 32 20 4c 44 41 6b 20 3f 71 75 69 6e 65 20 50 4f 50 32 0a 09 23 33 30 31 38 20 44 45 4f 20 23 33 30 31 38 20 44 45 4f 20 23 30 61 31 38 20 44 45 4f 0a 4a 4d 50 32 72 0a 0a 40 70 72 69 6e 74 0a 09 4c 44 41 6b 20 23 31 38 20 44 45 4f 20 49 4e 43 32 20 4c 44 41 6b 20 3f 70 72 69 6e 74 20 50 4f 50 32 0a 4a 4d 50 32 72 0a 0a 40 71 20 00
V
First we need a function that can print a list as a library.
[p [put ' 'put] map ' ' puts].
with that, the quine reduces to quine.v:
[dup puts p]
dup puts p
Using it:
$./v quine.v
[dup puts p]
dup puts p
VBA
Inspired bij the Pascal version
Public Sub quine()
quote = Chr(34)
comma = Chr(44)
cont = Chr(32) & Chr(95)
n = Array( _
"Public Sub quine()", _
" quote = Chr(34)", _
" comma = Chr(44)", _
" cont = Chr(32) & Chr(95)", _
" n = Array( _", _
" For i = 0 To 4", _
" Debug.Print n(i)", _
" Next i", _
" For i = 0 To 15", _
" Debug.Print quote & n(i) & quote & comma & cont", _
" Next i", _
" Debug.Print quote & n(15) & quote & Chr(41)", _
" For i = 5 To 15", _
" Debug.Print n(i)", _
" Next i", _
"End Sub")
For i = 0 To 4
Debug.Print n(i)
Next i
For i = 0 To 14
Debug.Print quote & n(i) & quote & comma & cont
Next i
Debug.Print quote & n(15) & quote & Chr(41)
For i = 5 To 15
Debug.Print n(i)
Next i
End Sub
Verbexx
Note: The input source code would normally include a Byte Order Mark (BOM) at the start. The output written to the console does not contain a BOM -- visually, the output looks the same as the input.
@VAR s = «@SAY (@FORMAT fmt:"@VAR s = %c%s%c;" 0x00AB s 0x00BB) s no_nl:;»; @SAY (@FORMAT fmt:"@VAR s = %c%s%c;" 0x00AB s 0x00BB) s no_nl:;
VHDL
LIBRARY ieee; USE std.TEXTIO.all;
entity quine is end entity quine;
architecture beh of quine is
type str_array is array(1 to 20) of string(1 to 80);
constant src : str_array := (
"LIBRARY ieee; USE std.TEXTIO.all; ",
"entity quine is end entity quine; ",
"architecture beh of quine is ",
" type str_array is array(1 to 20) of string(1 to 80); ",
" constant src : str_array := ( ",
"begin ",
" process variable l : line; begin ",
" for i in 1 to 5 loop write(l, src(i)); writeline(OUTPUT, l); end loop; ",
" for i in 1 to 20 loop ",
" write(l, character'val(32)&character'val(32)); ",
" write(l, character'val(32)&character'val(32)); ",
" write(l, character'val(34)); write(l, src(i)); write(l,character'val(34));",
" if i /= 20 then write(l, character'val(44)); ",
" else write(l, character'val(41)&character'val(59)); end if; ",
" writeline(OUTPUT, l); ",
" end loop; ",
" for i in 6 to 20 loop write(l, src(i)); writeline(OUTPUT, l); end loop; ",
" wait; ",
" end process; ",
"end architecture beh; ");
begin
process variable l : line; begin
for i in 1 to 5 loop write(l, src(i)); writeline(OUTPUT, l); end loop;
for i in 1 to 20 loop
write(l, character'val(32)&character'val(32));
write(l, character'val(32)&character'val(32));
write(l, character'val(34)); write(l, src(i)); write(l,character'val(34));
if i /= 20 then write(l, character'val(44));
else write(l, character'val(41)&character'val(59)); end if;
writeline(OUTPUT, l);
end loop;
for i in 6 to 20 loop write(l, src(i)); writeline(OUTPUT, l); end loop;
wait;
end process;
end architecture beh;
NOTE: ModelSim escapes each line in the console output with "# ".
Visual Basic .NET
Leading newline for appearance.
Module Program
Sub Main()
Dim s = "
Module Program
Sub Main()
Dim s = {0}{1}{0}
Console.WriteLine(s, ChrW(34), s)
End Sub
End Module"
Console.WriteLine(s, ChrW(34), s)
End Sub
End Module
Possibly shortest possible (must have strict and explicit off):
Module M
Sub Main
s="Module M
Sub Main
s={0}{1}{0}
Console.Write(s,ChrW(34),s)
End Sub
End Module"
Console.Write(s,ChrW(34),s)
End Sub
End Module
WDTE
let str => import 'strings';
let v => "let str => import 'strings';\nlet v => {q};\nstr.format v v -- io.writeln io.stdout;";
str.format v v -- io.writeln io.stdout;
Whitespace
Since Whitespace only uses integers (entered binary with S representing 0 and T representing) as data, the idea is the following: Create a big integer; Print it in base 3 with L as 2, T as 1 and S as 0; print it in Base 2 with T as 1 and S as 0 (The same way it was written into the Code)
As of this big integer, this code might not work in different interpreters. It works using the tio.run interpreter.
(Note Newline at the start and the end of the code)
Wren
import "./fmt" for Fmt
var a = "import $c./fmt$c for Fmt$c$cvar a = $q$cFmt.lprint(a, [34, 34, 10, 10, a, 10])"
Fmt.lprint(a, [34, 34, 10, 10, a, 10])
x86 Assembly
.global _start;_start:mov $p,%rsi;mov $1,%rax;mov $1,%rdi;mov $255,%rdx;syscall;mov $q,%rsi;mov $1,%rax;mov $1,%rdx;syscall;mov $p,%rsi;mov $1,%rax;mov $255,%rdx;syscall;mov $q,%rsi;mov $1,%rax;mov $1,%rdx;syscall;mov $60,%rax;syscall;q:.byte 34;p:.ascii ".global _start;_start:mov $p,%rsi;mov $1,%rax;mov $1,%rdi;mov $255,%rdx;syscall;mov $q,%rsi;mov $1,%rax;mov $1,%rdx;syscall;mov $p,%rsi;mov $1,%rax;mov $255,%rdx;syscall;mov $q,%rsi;mov $1,%rax;mov $1,%rdx;syscall;mov $60,%rax;syscall;q:.byte 34;p:.ascii "
Compile with `gcc -nostdlib quine.sx` where quine.sx is the filename. This is for GNU Assembler x64 syntax.
Here is the 32 bit version. Compile this with `gcc -nostdlib quine32.sx -m32`. The m32 flag tells gcc to parse the code as 32-bit.
.global _start;_start:mov $p,%ecx;mov $4,%eax;mov $1,%ebx;mov $264,%edx;int $0x80;mov $q,%ecx;mov $4,%eax;mov $1,%edx;int $0x80;mov $p,%ecx;mov $4,%eax;mov $264,%edx;int $0x80;mov $q,%ecx;mov $4,%eax;mov $1,%edx;int $0x80;mov $1,%eax;int $0x80;q:.byte 34;p:.ascii ".global _start;_start:mov $p,%ecx;mov $4,%eax;mov $1,%ebx;mov $264,%edx;int $0x80;mov $q,%ecx;mov $4,%eax;mov $1,%edx;int $0x80;mov $p,%ecx;mov $4,%eax;mov $264,%edx;int $0x80;mov $q,%ecx;mov $4,%eax;mov $1,%edx;int $0x80;mov $1,%eax;int $0x80;q:.byte 34;p:.ascii "
For readability, here's a bash one-liner. Again, quine.sx is the filename. If you have the scat highlighter, you can pipe it to that, too. Of course, this breaks the quine, so don't compile this version expecting it to work.
python -c "from pprint import pprint;prog=open('quine.sx', 'r').read().split(';',24);pprint(prog)" | tr "[]" " " | perl -pe "s/( '|'(,| ))//g"
zkl
The simplest is the zkl REPL and integers
zkl: 123
123
s:="s:=%c%s%c;print(s.fmt(34,s,34));";print(s.fmt(34,s,34));
a:="a:=;q:=(34).toChar();print(a[0,3]+q+a+q+a[3,*]);";q:=(34).toChar();print(a[0,3]+q+a+q+a[3,*]);
reg c=0'|"|,s="reg c=0'|%c|,s=%c%s%c;s.fmt(c,c,s,c).print();";s.fmt(c,c,s,c).print();
Create a file with:
File(__FILE__).readln().print()
and run it: $ zkl foo.zkl to generate the contents.
We can also write a quine tester since print both sends the results to the output device and returns them:
fcn testQuine(quine){
Compiler.Compiler.compileText(quine).__constructor(); out:=vm.regX;
println("\ndiff>>",quine-out,"<<");
}
testQuine(0'|s:="s:=%c%s%c;print(s.fmt(34,s,34));";print(s.fmt(34,s,34));|); s:="s:=%c%s%c;print(s.fmt(34,s,34));";print(s.fmt(34,s,34)); diff>><<
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