in reply to Can Perl do calculations?
In addition to the excellent book that davido suggested, you might also find Simon Cozens' Beginning Perl, which is available free online, useful. Chapter 2: Working with Simple Values (PDF format) explains data types, variables and operators and is a good introduction to performing calculations using Perl.
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Rozallin J. Thompson
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Rozallin J. Thompson
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Seekers of Perl Wisdom