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Variable types
Variables in Perl example from a Well House Consultants training course
More on Variables in Perl [link]

This example is described in the following article(s):
   • Object Orientation in an hour and other Perl Lectures - [link]

Source code: henry Module: P301

#Each of the variable types illistrated in Perl:

# scalar - int, float, string, reference or regex
$abc = 14;
$abc = "kjadjkajklsdljksdjkljklsdfjlksdkljsdjksdf";
$hello_world = 6.7;
print ("sample $abc $hello_world\n");

# lists - an ordered collection of scalars
@peeps = ("Phil","Dan","Chris","Antonio");
print @peeps,"\n"; # List context
print @peeps + 0 ,"\n"; # Scalar context
print "@peeps\n"; # Double Quote context
print $peeps[2],"\n";

# Hashes - a keyed but unordered collection of scalars
%liveat = ("Leena" => "San Franciso",
        Pavol => "Acton",
        Michelle => "Uxbridge",
        Lee => "Harrow");
print %liveat,"\n";

# code - something that can be run such as a sub
sub set { print 42; return 54; }
print &set,"\n";
print set(),"\n";
print set,"\n"; # ONLY works because set already defined

# File handle - the structure used to access a file or other type of stream
open fh,"<","20101116_statlog.txt";
$lyne = <fh>;
print $lyne;

# Typeglob / applies a second (extra) name to ALL variables called "peeps"
*team = *peeps;
print "Our team includes @team\n";


wizard:lf graham$ perl henry
sample kjadjkajklsdljksdjkljklsdfjlksdkljsdjksdf 6.7
Phil Dan Chris Antonio
MichelleUxbridgePavolActonLeenaSan FrancisoLeeHarrow
000101 115453 3 11 _____.__W__C_....._.........K 0.85 0.50 0.40 904528 879256
Our team includes Phil Dan Chris Antonio
wizard:lf graham$

Learn about this subject
This module and example are covered on our public Perl for Larger Projects course. If you have a group of three or more trainees who need to learn the subject, we can also arrange a private or on site course for you.

Books covering this topic
Yes. We have over 700 books in our library. Books covering Perl are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "Variables in Perl" training module. You'll find a description of the topic and some other closely related examples on the "Variables in Perl" module index page.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
• Our Solutions centre provides a number of longer technical articles.
• Our Opentalk forum archive provides a question and answer centre.
The Horse's mouth provides a daily tip or thought.
• Further resources are available via the resources centre.
• All of these resources can be searched through through our search engine
• And there's a global index here.

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This web site is written and maintained by Well House Consultants.

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