use strict not catching variables with one character as name ie $a

#!/usr/bin/perl -w
use strict;
$vara = "hello world";
print $vara;

fails to compile and strict complains. As expected. However.....

#!/usr/bin/perl -w
use strict;
$a = "hello world";
print $a;

compile and stict does not moan about the missing my in front the the declaration. why???
I have seen loads of use strict tutorials but nobody has mentioned this..
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

this only works for $a en $b I noticed.  Try this for example for $c, $x or $z and you will get the usual error-message.
I suppose this exception is included in the "strict"-module...?
It doesn't catch it because $a and $b are special variables used in sort.


sort { $a cmp $b} @list;

Strict doesn't complain because they are valid variables.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
I asked around here and this is the answer I get, and which is very reasonable in fact: $a and $b are special variables used in sorting. You shouldn't use $a and $b for variable names, because these variable names will always be exepted by perl
Amazon Web Services

Are you thinking about creating an Amazon Web Services account for your business? Not sure where to start? In this course you’ll get an overview of the history of AWS and take a tour of their user interface.

okay, too late again :-)
phil34Author Commented:
Thankyou very much, I will write my own use strict tutorial and bring this up. I think the is very important. I thought maybe stict would allow one characters because perl has many special variable with only one character ie $! $_ $' etc although I did not think about $a and $b for the sort. I bet there are alot of people using $a and $b for variable names and not even realizing that.
It even had me confused for a second.... I figured strict would catch it if they didn't appear inside a sort block, but I guess we both learned something :)
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Web Languages and Standards

From novice to tech pro — start learning today.