[MacPerl-AnyPerl] Subroutine Argument Placeholder

["Richard L. Grubb" <richard.l.grubb@boeing.com>]

Is there any way (or maybe I should say, How many ways are there) in
Perl to get a subroutine to recognize
a null argument?

For instance, I would like subroutine sample below to
print out

1

2

or

1
NULL
2

Instead, it prints

1
2

----------------- perl code snippet -----------
&sample(1.0,,2.0);

sub sample
{
  foreach (@_)
  {
    print "$_ \n";
  }
}

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