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use strict;
use warnings;
...
else {
  print "Returned <undef>\n";
}

Returned <undef>

#include <stdio.h>
#include <windows.h>
...
void main(void) {
  printf("Lang ID = 0x%04X\n", GetSystemDefaultLangID());
}

use strict;
use warnings;
...
else {
  print "Returned <undef>\n";
}