A quick try. My understanding of the data structure is as follows: 
use strict;
use warnings;

my $pt = { value => "D", next => undef }; 
my $pt2 = {value => "C", next => $pt};
$pt = {value => "B", next => $pt2};
my $L = { value => "A", next => $pt};

[download]
(It could be much simpler, but I wanted to stay at a relative beginner level.

It took me less than 5 minutes to write the code to count the nodes, but I'll reveal it only later, once I am sure that this cannot used for other purpose.

My iterative solution subroutine prints out the node being visited and the node count as follows: 

ABCD
4

[download]
Very easy.

A recursive solution would probably be even simpler, but I haven't tried so far.

Je suis Charlie.

In reply to Re^3: Perl linked list by Laurent_R
in thread Perl linked list by Perl_is_Perl

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