Christopher Yee Mon wrote:
>
> I have a bit of Perl homework where we got a code sample. I can see what
> the code sample is doing except for two little bits
>
> There's a part that has $row->[$i] and a part that has @$row . What do
> these two parts mean?
>
> The code sample turns csv into fixed width so it reads each line of the
> file into an array @rows. Then in a for loop
>
> for $row (@rows) {
>
> There's another for loop
>
> for $row (@rows) {
> ~ for ($i = 0; $i < @$row; i++) {
> ~ $w = length $row->[$i]
> ~ ...
>
> I'm assuming that the $row is itself another array or can be treated as
> one and @$row can give you a number of the elements in it and $row->[$i]
> is some sort of deferencing mechanism. The perlop page seemed a bit
> cryptic to me as to what the arrow operator does exactly and I could
> search for the use of @ in that context.
>
> Any assistance would be appreciated.
Since it's homework (thank you for telling us) you should do your own research
so that it sticks in your memory.
Take a look at
perldoc perlref
and
perldoc perlreftut
and see if that helps you. If you're still struggling after studying those
documents then we're still here :)
(By the way, the piece of code you've shown breaks a couple of rules that you
may want to ask about when you have solved the problem at hand!)
Rob
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