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Romeo and Julie - solution
Subroutines in Perl example from a Well House Consultants training course
More on Subroutines in Perl [link]

This example is described in the following article(s):
   • Romeo and Julie - [link]
   • Fresh Perl Teaching Examples - part 2 of 3 - [link]

Source code: romeo Module: P209

=head1 Romeo and Julie - solution

Romeo wants to rescue his girlfriend Julie from
her evil stepdad's home, where she has been
locked in her room ... high on the castle mound
in far, far, away.

Julie's room is 4 metres up on the first floor,
and the only stable ground below it is 3 metres
from the wall. The castle mound in 12 metres
tall and the moat makes it impractical to get
the base of the ladder nearer that 5 metres from
the mound.

Romeo is going to buy two ladders from B and Q
to reach Julie. Write a program to work out
how long the ladders should be.

=cut


use bandq;

$h = "Romeo";
$w = "Julie";

# Oh heck - I don't know the algorithm so I'll
# hide it within a "sub" ....

$lad1 = bandq::ladlen(4,3);
# When called with a list, also returns a
# stability factor.
($lad2,$sf) = bandq::ladlen(12,5);

print "$h must buy ladders $lad1 and $lad2" .
        " m to get to $w\n";

print "Stability factor is $sf\n";

# Following line waits for keyboard input on
# a windows box so that the user gets a chance
# to see the results before the flash away!

$wait = <STDIN> if ($^O =~ /^MS/);

Learn about this subject
This module and example are covered on the following public courses:
 * Perl Programming
 * Perl bootcamp
 * Learning to program in Perl
 * Perl Programming
Also available on on site courses for larger groups

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 "Subroutines in Perl" training module. You'll find a description of the topic and some other closely related examples on the "Subroutines 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.

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