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produces a copy of its own source code
In computing, a quine is a computer program which produces a copy of its own source code as its only output.
python
# adapted from a Quine by Sean B. Palmer
print (lambda s='print (lambda s=%r: (s %% s))()': (s % s))()
print (lambda s='print (lambda s=%r: (s %% s))()': (s % s))()
x='x=%r;print(x%%x)';print(x%x)
cpp
#include <cstdio>
#define B(x) x; printf("{ B(" #x ") }\n");
int main()
{ B(printf("#include <cstdio>\n#define B(x) x; printf(\"{ B(\" #x \") }\\n\");\nint main()\n")) }
#define B(x) x; printf("{ B(" #x ") }\n");
int main()
{ B(printf("#include <cstdio>\n#define B(x) x; printf(\"{ B(\" #x \") }\\n\");\nint main()\n")) }
groovy
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,_
