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Re^3: Numification of strings

by LanX (Canon)
on Aug 02, 2010 at 12:38 UTC ( #852465=note: print w/ replies, xml ) Need Help??

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  1. or download this
      DB<33> my $y;$y++
      
      DB<34> my $y;$y+1
    Use of uninitialized value $y in addition (+) at (eval 38)[/usr/share/
    +perl/5.10/perl5db.pl:638] line 2.
    
  2. or download this
            The auto-increment operator has a little extra builtin magic t
    +o it.
     
    ...
           "undef" is always treated as numeric, and in particular is chan
    +ged to 0
           before incrementing (so that a post-increment of an undef value
    + will
           return 0 rather than "undef").
    

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