Self printing signature programs
Signature programs are short programs that
people have been using as part of their signature. They are small
(2 to 4 lines) programs, that are often rather cryptic because they
have to save space as much as possible.
On this page some self printing signature programs are presented.
Self printing programs are also called
Quines.
Below are three self printing programs in C written by Dario Dariol,
which are described in the standard GNU distribution since 1990:
main(a,b){a="main(a,b){a=%c%s%c;b='%c';printf(a,b,a,b,b);}";b='"';printf(a,b,a,b,b);}
main(a){a="main(a){a=%c%s%c;printf(a,34,a,34);}";printf(a,34,a,34);}
main(a){printf(a="main(a){printf(a=%c%s%c,34,a,34);}",34,a,34);}
Only the first version is ASCII independent. The first two are compiler
independent. Dario also wrote a hiding siganture programs
and a self-printing one in Java.
Another self printing program in C is:
char *p="char *p=%c%s%c;main(){printf(p,34,p,34);}";main(){printf(p,34,p,34);}
This has been used by Mike Davis ..!att!ihlpm!jmdavis, and
Paul Makepeace.
A shorter one, in Miranda by
Maarten Fokkinga:
t c=c++show c;self=s"t c=c++show c;self=s"
An this one, which is even shorter, works for Tom Phoenix on his Unix system:
% /bin/ksh: /bin/ksh:: not found
main() {char *p,a;printf(p="main() {char *p,a;printf(p=%c%s%c,a='",a='"',p,
a);printf(p="%c',p,%ca);printf(p=%c%s%c%c,a,10,a,p,a,10,a,%c%s%c,a,10);}%c"
,a,10,a,p,a,10,a," *** Email: xxxxxxx@xxx.xx *** IRC: Zuikkis *** ",a,10);}
$_=q{$_=q{Q};s/Q/$_/;print};s/Q/$_/;print
A little long (444 characters) for a signature, but as the first Java attempt,
worth mentioning:
import java.text.*;class a{public static void main(String x[]){char b[]={34};char c[]={123};String s[]=new String[3];s[0]="import java.text.*;class a{2}public static void main(String x[]){2}char b[]={2}34};char c[]={2}123};String s[]=new String[3];s[0]={1}{0}{1};s[1]=new String(b);s[2]=new String(c);System.out.println(MessageFormat.format(s[0],s));}}";s[1]=new String(b);s[2]=new String(c);System.out.println(MessageFormat.format(s[0],s));}}
He also wrote some in C and a
hiding program signature program.
python -c "x='python -c %sx=%s; print x%%(chr(34),repr(x),chr(34))%s'; print x%(chr(34),repr(x),chr(34))"
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