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# define  o(o) printf(o) /*
sub o {print(reverse((split
(//,shift))[0..6]) . "\n")}
o `cc -oo $0>&-&&./o;rm o`;
o <<'main()';
tenuces */
{ o("tenuces"); }

This program is bilingual: It can be run with Perl and then prints "secunet" three times. It is also valid C code and hence can be compiled with cc. The produced binary will print "tenuces".

Download the source.

For a better understanding you can
highlight the syntax: [ C | Perl ]