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  1. or download this
    perl -wde 0
  2. or download this
    > perl -we "print 0+'abc'"
Argument "abc" isn't numeric in addition (+) at -e line 1.
0
> perl -wde 0
  DB<1> print 0+'abc'
0
  3. or download this
    >perl -wde 0
  DB<1> print undef;
Use of uninitialized value in print at (eval 5) [D:/Perl/lib/perl5db.p
+l:1510] line 2, <IN> line 1.