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Here's a multiple-language program, or polyglot, that prints out the well-known phrase. It can be run in Perl, C (with one compiler warning), Tcl, and REBOL.
#include <stdlib.h> #include <stdio.h> #define p \ <<END set // [if 0 { ; int main() { /* }}]; puts "Hello world from Tcl!" if 0 { { */ printf("Hello world from C!\n"); return 0; } /* END ; print("Hello world from Perl!\n"); <<quit } exit REBOL [] print "Hello world from REBOL!" quit ;#*/
edit: removed an unnecessary #define, a fragment from an earlier version of the code. It was actually a somewhat cunning way to obfuscate the code, but this code isn't strictly designed just to frustrate the reader.

another edit: The "fix" broke it. It really does work now.

In reply to Hello World in four languages... at the same time by AlexL

and:  <code> code here </code>

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