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If no value is assigned to a scalar variable, it contains undef.
The example in the book doesn't want to show you what undef is, though. You should experiment with assigning various values to the variables and running the comparison, e.g.
and
map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]
In reply to Re: Learning Programming, desperately need to know what information is contained in scalar variables
by choroba
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