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    $! = 10;
    print "Hello", $!>0, "World\n";

    $! = 0;
    print "Hello", $!>0, "World\n";

  print wantarray ? YES : NO , "\n";

int main()
{
...
    sprintf (buf, "Hello %s here\n", a);
    printf ("%s", buf);
}

  $count = ("abc", "abc", "abc")