> On Feb 9, 2017, at 7:39 AM, Simon Bauer <simo...@web.de> wrote:
> 
> Hi,
>  
> when I turn on -W in one of my perl scripts then I get a lot of warnings 
> concerning Math::Complex
>  
>  Prototype mismatch: sub Math::Complex::abs (_) vs none at 
> /usr/share/perl/5.22/Math/Complex.pm line 667.
>  Prototype mismatch: sub Math::Complex::sqrt (_) vs none at 
> /usr/share/perl/5.22/Math/Complex.pm line 718.
>  Prototype mismatch: sub Math::Complex::exp (_) vs none at 
> /usr/share/perl/5.22/Math/Complex.pm line 849.
>  Prototype mismatch: sub Math::Complex::log (_) vs none at 
> /usr/share/perl/5.22/Math/Complex.pm line 888.
>  Prototype mismatch: sub Math::Complex::cos (_) vs none at 
> /usr/share/perl/5.22/Math/Complex.pm line 935.
>  Prototype mismatch: sub Math::Complex::sin (_) vs none at 
> /usr/share/perl/5.22/Math/Complex.pm line 952.

Put the following in your Perl program to turn on warnings in the enclosing 
block only (i.e., just your program and not external modules):

  use warnings;

See the following for more information:

perldoc warnings
perldoc perllexwarn

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