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Topic: Perl control structures

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	Perl - Wikipedia, the free encyclopedia
		Perl is widely used in finance and bioinformatics, where it is valued for rapid application development, ability to handle large data sets, and the availability of many standard and third-party modules.
		Perl is implemented as a core interpreter, written in C, together with a large collection of modules, written in Perl and C. The source distribution is, as of 2005, 12 MB when packaged in a tar file and compressed.
		Perl developers rely on the functional tests to ensure that changes to the interpreter do not introduce bugs; conversely, Perl users who see the interpreter pass its functional tests on their system can have a high degree of confidence that it is working properly.
	en.wikipedia.org /wiki/Perl (5477 words)

	A Shortcut to Perl (2)
		which is used in the three structures for controlling the number of times the loop is executed, is called the looping variable.
		The commands in iterative structures will be executed in the same way until the value of a condition changes or the list of specified looping variable values becomes exhausted.
		In Perl as we are using it right now, variables are defined automatically the first time when a variable is stored in them.
	ilps.science.uva.nl /~erikt/perl/ln02.html (1224 words)

	Perl - Control Structures and Functions (Site not responding. Last check: 2007-10-11)
		These are loop control structures used respectively for a true expression continue, or a false expression stop.
		See example 6 You can omit the control scalar variable and Perl will default to the $_ variable as a scratch variable (this is also true in many other circumstances).
		In Windows (if you accepted the defaults) the Perl lib sub-directory should be in C:\Perl\lib; while in Linux it should be in /usr/lib/perl5/site_perl.
	home.ubalt.edu /abento/452/perl/perlfunctions.html (492 words)

	Basic Perl Syntax Guide - Control Structures and Conditional Statements
		Control Structures let you iterate through various types of variables.
		There are three main control structures I recommend using in programming cgi scripts: foreach, while, and for.
		It is by using conditional statements in perl that we are able to give our programs what is called “logic”, or the ability to determine a particular course of action.
	www.expertwebinstalls.com /cgi_tutorial/basic_perl_syntax_guide_control_structures_conditionals.html (664 words)

	Perl CGI Lecture Notes (Perl Control Structures, Functions & Modules) (Site not responding. Last check: 2007-10-11)
		Perl evaluates the expression to be a string in scalar context.
		Perl packages are a mechanism to protect different sections of code from accidentally tampering with each other's variables.
		A Perl module is a re-usable package defined in a file that has the same name as the package with a.pm file extension.
	www.gre.ac.uk /~k.mcmanus/web/perl/PerlFunc.html (944 words)

	Perl Control Structures
		Control Structures provide a means of controlling the flow of a program.
		In perl things are a bit more complex, this is necessary since we often deal with strings (not just numbers).
		Formally, perl first converts a conditional value to a string and then if the result is either the empty string or the string "0" the expression is FALSE, otherwise it is TRUE.
	www.cs.rpi.edu /~hollingd/eiw-2003/notes/PerlControl/PerlControl.html (1206 words)

	Free2Code - articles - Intro to Perl - Starting
		This is the path to the perl interpreter on the system the program is being run on.
		If you're using activestate perl with windows the path to perl is included in your "path" and including this line isn't compulsory.
		However it is always good practice to write all your perl programs starting with this line, you never know if you may have to move the script to a unix system, try to format your programs neatly and correctly, it makes things alot easier when you need to do some editing.
	www.free2code.net /tutorials/perl/perlbasic (273 words)

	Programming:Perl/Flow control - Wikibooks, collection of open-content textbooks
		The basic control structures do not differ greatly from those used in the C programming language or Java programming language:
		The do {} while and the do {} until loops are technically Statement Modifiers and not actual control structures.
		Control statements can also be written with the conditional following the statements.
	en.wikibooks.org /wiki/Programming:Perl_Flow_control (273 words)

	Unix: Introduction to Perl - Control Structures
		Some structures apply by default to only one line of code; if you want to apply them to more than one line of code, or for those that require code blocks, simply enclose the lines in {}s.
		...to have control, you have to be able to decide things, and to decide things, you have to know the difference between what's true and what's false.
		Unlike other structures, though, it has a built-in way to initialize variables to a certain value, and a bit of code to run each time before it repeats.
	staff.washington.edu /bmaust/perl/control.html (492 words)

	perl basics (Site not responding. Last check: 2007-10-11)
		If you are just learning Perl, you may also wish to consult a text, such as the Schwartz (with Wall) Learning Perl, published by O'Reilly & Associates, or their more advanced Programmig Perl, by Wall and Schwartz.
		Perl is an iterative language in which control flows from the first statement in the program to the last statement unless something interrupts.
		Perl provides basic I/O for both the standard input (keyboard) and output (display) devices and for files in the UNIX file system.
	www.cs.unc.edu /~jbs/resources/perl/perl-basics (498 words)

	Perl Control - CMSC 491C - Fall 2001 (Site not responding. Last check: 2007-10-11)
		Perl contructs "blocks" of code to be executed as a group with curly braces, like C or Java.
		Curly braces are required with the control structures.
		Perl has "and" as well as "&&" for logical and-ing two values.
	userpages.umbc.edu /~afort1/scripting/perl/notes04.html (524 words)

	perl.com: Exegesis 4
		In Apocalypse 4, Larry explains the fundamental changes to flow and block control in Perl 6.
		Unlike Perl 5, that classname is not a bareword string: It's a genuine first-class symbol in the program.
		Modules and packages are also first class in Perl 6, so we can also refer to their names directly, or take references to them, or look them up in the appropriate symbol table.
	www.perl.com /pub/a/2002/04/01/exegesis4.html (560 words)

	Perl Programming: Technology Training from Dan Keller
		This course is for programmers who want to add Perl to their repertory of languages.
		With a series of practical examples that are increasingly sophisticated, this course teaches the foundations of Perl programming.
		Attendees emerge with practical skills and are indeed able to write Perl programs of their own, yet they are away from their desks for a minimum time.
	www.keller.com /curric/perl.html (304 words)

	Brief Introduction to Perl: Flow of Control Structures (Site not responding. Last check: 2007-10-11)
		Blocks of statements are delimited by a pair of {}.
		Each statement in a statement block (the entire file containing a Perl program is implicitly enclosed in {}) will be executed from beginning to end as a group (if the command is to be executed).
		Perl has several decision structures: if, if-else, if-elsif-if, and unless.
	www.vex.net /~marc/perl/intro_cgi_with_perl-4.html (241 words)

	Chapter 3 -- Programming with Perl (Site not responding. Last check: 2007-10-11)
		Instead, Perl creates a string of key/value pairs in whatever order is easiest at the time, depending on the phases of the moon.
		There are a number of special variables in Perl, like $_, that have their own designated features designed to make Perl easier to use, and they are touched on throughout the book where most appropriate.
		Perl uses the "I" symbol to tell a regular expression to ignore case in matching.
	www.ssuet.edu.pk /taimoor/books/1-56276-420-9/ch3.htm (6674 words)

	Picking Up Perl - Control Structures
		Although Perl is not purely an imperative programming language, it has ancestors that are very much imperative in nature, and thus Perl has inherited those same control structures.
		However, now that we are going to begin studying various control structures that rely on the truth value of a given expression, we should look at true and false values in Perl a bit more closely.
		structure takes a scalar, a list and a block, and executes the block of code, setting the scalar to each value in the list, one at a time.
	www.ebb.org /PickingUpPerl/pickingUpPerl_5.html (825 words)

	Perl tutorial: Control structures
		Perl supports lots of different kinds of control structures which tend to be like those in C, but are very similar to Pascal, too.
		The while structure should be fairly clear, but this is the opportunity to notice several things.
		When you have done this see if you can alter it so that line numbers are printed as 001, 002,..., 009, 010, 011, 012, etc. To do this you should only need to change one line by inserting an extra four characters.
	www.comp.leeds.ac.uk /Perl/control.html (717 words)

	Control flow: Builtin switch statement -
		This RFC proposes a syntax and semantics for an explicit case mechanism for Perl.
		In seeking to devise a "Swiss Army" case mechanism suitable for Perl, it is useful to generalize the switch/case notion of distributed conditional testing as far as possible.
		Specifically, the concept of "matching" between the switch value and the various case values need not be restricted to numeric (or string or referential) equality, as it is in other languages.
	dev.perl.org /rfc/22.html (653 words)

	Introduction to Web Programming \| Perl Control Structures (Site not responding. Last check: 2007-10-11)
		Some of the most powerful tools of Perl programming are control structures.
		Control structures are used to create the basic logic that drives many of the routines used in CGI applications.
		These control structures use Boolean logic to imbue your script with the intelligence necessary to manage the diverse needs of the clients with the abilities and requirements of the server.
	www-ims.oit.umass.edu /ltkach/webpro/perl_control_structures.html (61 words)

	Controlling Program Flow in Perl > Blocks
		and the logical operators, are used to control whether portions of the program run, depending on true or false values.
		One of the reasons that you use computers is that computers are very good at performing repetitive tasks—over and over again—without getting tired or bored and without developing carpal tunnel syndrome.
		So far, you haven't had any way of telling Perl to "do this task X times" or to "repeat this task until it's done." In this hour, you will learn about Perl's control structures.
	www.informit.com /articles/article.asp?p=395035&rl=1 (490 words)

	Picking Up Perl 0.11
		Perl as a Natural Language: How Perl can be considered a ``natural language''.
		Perl is a wonderful programming language, but is really not the best choice for a first programming language.
		Perl is a mostly system independent language, however, getting Perl to work on a given system requires a variety of different steps.
	www.lagmonster.org /docs/pickingUpPerl.html (13113 words)

	perl.com: Choosing a Templating System
		Components (templates) can include a section of Perl at the end of the file that is wrapped inside a special tag indicating that it should be run first, before the rest of the template.
		This is similar to the other embedded Perl templating tools, but the focus is on using the built-in XPath functions for querying an XML document and manipulating the retrieved data.
		Possibly the first module to embed Perl code in a text or HTML file, ePerl is still a viable option in the form of Apache::ePerl.
	www.perl.com /pub/a/2001/08/21/templating.html?page=3 (3619 words)

	Picking Up Perl 0.12
		This is because Perl cannot tell where the name of the scalar variable ends and where the literal text you want in the string begins.
		The arrays in Perl are semantically closest to lists in Lisp or Scheme (sans cons cells), however the syntax that is used to access arrays is closer to arrays in C. In fact, one can often treat Perl's arrays as if they were simply C arrays, but they are actually much more powerful than that.
		Note that this is inherently different from arrays in the C language, where the programmer must keep track and control the size of the array.
	www.ebb.org /PickingUpPerl/pickingUpPerl.html (13493 words)

	CONTENTS (Site not responding. Last check: 2007-10-11)
		This panicky feeling is also one of the reactions the creators of Perl took into account when designing and refining their programming language.
		Perl is a powerful computer language that is accessible for use by a wide range of people.
		While this may not have been the original aim of Perl, it clearly could have been.
	www.ssuet.edu.pk /taimoor/books/1-56276-420-9 (579 words)

	Perl How to Program (Site not responding. Last check: 2007-10-11)
		The book begins with a clear and careful introduction to the concepts of structured programming at a level suitable for beginners to programming, and proceeds through advanced topics such as references and complex data structures.
		Important topics in Perl such as regular expressions and string manipulation receive a detailed treatment.
		Perl How to Program is geared toward both Unix/Linux and Windows users.
	cwx.prenhall.com /bookbind/pubbooks/deitel9 (459 words)

	Tutorials Perl basics help tutorial PERL script examples TUTORIAL help PERL Tutorial
		This is a local copy of a tutorial on Perl, originally written by Nik Silver as the first part of a one-day hands-on workshop at the School of Computer Studies, University of Leeds, in the UK.
		Perl Tutorials, Manuals, References You are visitor number Kulichki Advertising Perl FAQ by Stephen P Potter From comp.lang.perl Perl Tutorial by Nik Silver Plain text...
		Perl Tutorial Perl is an interpreted programming language known for its power and flexibility.
	www.taxpolicy.com /tutorial/pltutor.htm (2193 words)

	WDVL: Statement Blocks
		All control structures are divided into the control statement (which we will explain below) and the statement block.
		Perl will execute each statement in a statement block from beginning to end as a group.
		When, how, or if the script will execute the commands however, is determined by the control statement.
	wdvl.internet.com /Authoring/Scripting/Tutorial/perl_statement_blocks.html (158 words)

	CGI Programming 101: Chapter 5: Advanced Forms and Perl Control Structures
		Control structures include conditional statements, such as if/elsif/else blocks, as well as loops like
		In Perl, any string is true except the empty string and 0.
		Now that you've seen the various types of Perl control structures, let's look at how to apply them to handling advanced form data.
	www.cgi101.com /book/ch5/text.html (2156 words)

	[No title]
		Below is a simple PERL program: ======================================================= #!/usr/local/bin/perl # this is a comment print ``hello, world\n''; ======================================================= The first line specifies where to find perl.
		You do not have to specify which of these it is. Perl figures it out based on context.
		The first is the character sequence that will be placed between elements of the array, and the second specifies the array to be joined.
	www.cs.jhu.edu /~hajic/perlguide.txt (1342 words)

	Lecture 11
		Because it affects the flow of the program it is a control flow statement
		Perl allows a scalar variable that can hold a numerical value; let’s call it $ct
		If Perl can’t find the file that is to be opened we want to
	www.chss.montclair.edu /linguistics/lingpage/faculty/fitz/textools/textools03/Lect11.htm (334 words)

	! Aware to Perl: my() in Control Structures
		Tips: Browse or Search all pages for efficient awareness of Perl functions, operators, and FAQs.
		(with or without the parentheses) in the control expressions of control structures such as:
		Also, you can declare a foreach loop control variable as lexical by preceding it with the word ``my''.
	www.rocketaware.com /perl/perldelta/my.htm (128 words)

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