use Math::Complex; use strict; my $x = 1+1*i; print $x*undef; #### Use of uninitialized value $z2 in multiplication (*) at /usr/share/perl/5.14/Math/Complex.pm line 471. Use of uninitialized value $z2 in multiplication (*) at /usr/share/perl/5.14/Math/Complex.pm line 471. 0