in reply to undef number?

Any value in your list would do, such as the first value $number_to_compare will take. 
my $max = $numbers[0];
for (@numbers) {
   $max = $_ if $_ > $max;
}

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Update: Added example.

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Re^2: undef number?
by PeterPeiGuo (Hermit) on Apr 18, 2010 at 02:12 UTC

    That's right. The OP is not really looking for the biggest number that perl can express, but the biggest number of his own collection.

    Peter (Guo) Pei

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