I think it's also worth pointing out a few things since you're new here. PerlMonks for the Absolute Beginner is a nice short tutorial giving an overview of the site. It's perhaps easier to post the actual questions and data rather than a screenshot that people may or may not look at. Check out How do I post a question effectively?. Finally advice on selecting a meaningful title How do I compose an effective node title?. This may seem overwhelming at the moment, given that you've simply asked one question. I do advise taking the time to work through it in order to get the most out of the site.

Update: fixed typo.

Hi, for clarity can you confirm that the three sections of the image you have posted are the question, the answer and an explanation?

If we take the first image you've posted it then it's correct to say that there will be no output to speak of. Clarity can be gained by adding use warnings; to the example code:

#!/usr/bin/perl
use warnings;

@this_array = ("b", "a", "d", "c");
foreach($this_array){
    print("$_\n");
}
[download]

Which will return:

Use of uninitialized value $_ in concatenation (.) or string at derp.p
+l line 7.
[download]

By simply changing the code to:

#!/usr/bin/perl
use warnings;

@this_array = ("b", "a", "d", "c");
foreach(@this_array){   # note @this_array not $this_array
    print("$_\n");
}
[download]

We now have working code which prints each item within the array. This is discussed in the third pannel (the explanation?). Out of curiosity is this a distance learning thing?

Line 2 for the first question should be:

foreach(@this_array) {
[download]

... because @this_array and $this_array are different and unrelated variables.

And for the other question, line 2 should be:

%car_hash = reverse(%car_hash);
[download]

... again because $car_hash and %car_hash are different variables, but also because reverse() returns the reversed hash, so you need to assign it somewhere.

I'm surprised the exam questions contain such basic errors.

"I'm surprised the exam questions contain such basic errors."

Perhaps this is the purpose of the question, to introduce a problem and ask what they output will be, and why.

Have a read through http://perldoc.perl.org/perldata.html The two examples given both define one type of data store (array, hash) and then refer to another type of data store (scalar). Once you have read the above link play with some code and post code you can not get working.

Cheers,
R.

In common with some other Monks, I'm extremely averse to visting unknown sites to acquire unknown malware.

Sorry.

However, also in keeping with a note from marto, I really should have included this earlier:

• PerlMonks FAQ
• Guide to the Monastery
• On asking for help
• How do I post a question effectively?
• I know what I mean. Why don't you?
• What shortcuts can I use for linking to other information?

As to the dollars and donuts, I would argue (despite the downvoting which was majority when this was written) that in this case I should probably get both.   :-)

'I don't happen to know what an "NVQ" is -- nor care -- but I'll take $ to donuts that it's related to production of income.'

'On the other hand, if this is other than an extremely amateur-ish phishing expedition, perhaps you'll take the trouble to actually post the msterial, and a problem statement more precise than the tenditious statement that the "practice exam questions have been written wrong", I may be inclined to discount my fees.'

This is quite the overreaction. A National_Vocational_Qualification is about work based training (undertaken while employed in some capacity) and assessment of said training, generally by people who have completed high school but have no further formal education. It doesn't necessarily relate to getting more money. People should always be free to ask questions of this nature without ridicule. They are relatively young, a new member and first time poster. Hopefully this won't give them too much of a bad impression.

Update: s/over reaction/overreaction/

An NVQ is a recognised "in-work" qualification in the UK. As a rough guide, they are qualifications earned whilst you are an apprentice in a job.

I think you were a little quick on the trigger there, pardner! :-)

P.S. Do we get the dollars or the donuts? :-)

If you spot any bugs in my solutions, it's because I've deliberately left them in as an exercise for the reader! :-)

Dollars to doughnuts, this volume of the encyclopaedia covers a very small portion of the alphabet.

package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name