perl -wde 0

##</code><code>##

> 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

##</code><code>##

>perl -wde 0
  DB<1> print undef;
Use of uninitialized value in print at (eval 5) [D:/Perl/lib/perl5db.pl:1510] line 2, <IN> line 1.