http://www.perlmonks.org?node_id=943

Integer literals in Perl are pretty straight forward

Here are some examples
143
-3
-8431
42
0

Theres a little bit more to know about float literals.

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Re: Integer Literals in Perl
by Anonymous Monk on Mar 27, 2002 at 01:42 UTC
    1_000_000 and -5_5555_5 work fine too.
        -2.3 24