On Tue, 17 Apr 2012 14:43:01 +0100
Gary Stainburn <gary.stainb...@ringways.co.uk> wrote:
> On Tuesday 17 April 2012 13:30:59 Manfred Lotz wrote:
> >
> > One example is this:
> >
> > #! /usr/bin/perl
> >
> > use strict;
> > use warnings;
> >
> > mysub;
> >
> > sub mysub {
> > print "Hi there\n";
> > }
> >
> > If you run this you get an error:
> > Bareword "mysub" not allowed while "strict subs" in use
> > at ./testsub.pl line 6. Execution of ./testsub.pl aborted due to
> > compilation errors.
> >
> >
> > Perl tells you that it has no idea what you mean when you use the
> > bareword mysub.
> >
> >
> > Now you have two options to solve it.
> >
> > 1. &mysub;
> >
> > Using the sigil & you tell Perl that mysub is a subroutine.
> >
> > 2. mysub();
> >
> > Usind () after mysub you also tell Perl that mysub is a subroutine.
> >
> >
> > 3. &mysub();
> >
> > Combining 1. and 2. works also but is not recommended. Hmm, at
> > least I do no recommend it.
> >
> >
> > Use 2. and you'll be happy.
> >
> >
> > There are surely some other situations where using & might be
> > appropriate. But this one came into my mind immediately.
> >Hi Manfred,
>
> Thank you for this, but below is what I am meaning.
>
> Gary
>
> [root@stan ~]# cat t.pl
> #!/usr/bin/perl -w
>
> use strict;
> use warnings;
>
>
> mysub();
>
>
> sub mysub() {
> print "hello world\n";
> }
> [root@stan ~]# ./t.pl
> main::mysub() called too early to check prototype at ./t.pl line 7.
> hello world
>
> }
>
You have
sub mysub() {
instead of
sub mysub {
which is the correct way.
--
Manfred
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