there is no functional difference between the lexical file handles in your example and the traditional global file handles
Please see this recent discussion about lexical vs. bareword filehandles. In particular, open(N, "<", $filename); chomp (my $numbers = <M>); only gives warnings, while open(my $N, "<", $filename); chomp (my $numbers = <$M>); is of course a fatal error under strict. Also, bareword filehandles clash with package names.
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
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