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#!/usr/bin/perl
use strict;
use warnings;
...
} else {
  say "'$s' may be a string\n";    # Not "isn't a number"
}

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C:\>numVSstring.pl
Enter a number or string: 123.2
123.2 is a number
...
C:\>numVSstring.pl
Enter a number or string: III
'III' may be a string