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'''Pseudocode''' is an  informal [[High-level programming language|high-level]] description of the operating principle of a [[computer program]] or other [[algorithm]].
 
It uses the structural conventions of a [[programming language]], but is intended for human reading rather than machine reading. Pseudocode typically omits details that are not essential for human understanding of the algorithm, such as [[variable declaration]]s, system-specific code and some [[subroutines]]. The programming language is augmented with [[natural language]] description details, where convenient, or with compact mathematical notation. The purpose of using pseudocode is that it is easier for people to understand than conventional programming language code, and that it is an efficient and environment-independent description of the key principles of an algorithm. It is commonly used in textbooks and scientific publications that are documenting various algorithms, and also in planning of computer program development, for sketching out the structure of the program before the actual coding takes place.
 
No standard for pseudocode syntax exists, as a program in pseudocode is not an executable program. Pseudocode resembles, but should not be confused with [[Skeleton (computer programming)|skeleton programs]], including [[dummy code]], which can be [[Compiler|compiled]] without errors. [[Flowchart]]s and [[Unified Modeling Language]] (UML) charts can be thought of as a graphical alternative to pseudocode, but are more spacious on paper.
 
==Application==
Textbooks and [[scientific publication]]s related to [[computer science]] and [[numerical computation]] often use pseudocode in description of algorithms, so that all programmers can understand them, even if they do not all know the same programming languages. In textbooks, there is usually an accompanying introduction explaining the particular conventions in use. The level of detail of the pseudo-code may in some cases approach that of formalized general-purpose languages.
 
A [[programmer]] who needs to implement a specific algorithm, especially an unfamiliar one, will often start with a pseudocode description, and then  "translate" that description into the target programming language and modify it to interact correctly with the rest of the program. Programmers may also start a project by sketching out the code in pseudocode on paper before writing it in its actual language, as a [[Top-down and bottom-up design|top-down]] structuring approach, with a stepwise refinement.
 
==Syntax==
As the name suggests, pseudocode generally does not actually obey the [[syntax]] rules of any particular language; there is no systematic standard form, although any particular writer will generally borrow style and syntax; for example, control structures from some conventional programming language. Popular syntax sources include [[Pascal programming language|Pascal]], [[BASIC]], [[C (programming language)|C]], [[C++]], [[Java (programming language)|Java]], [[Lisp programming language|Lisp]], and [[ALGOL]]. Variable declarations are typically omitted. Function calls and blocks of code, such as code contained within a loop, are often replaced by a one-line natural language sentence.
 
Depending on the writer, pseudocode may therefore vary widely in style, from a near-exact imitation of a real programming language at one extreme, to a description approaching formatted prose at the other.
 
This is an example of pseudocode (for the [[mathematical game]] [[fizz buzz]]):
{| class="wikitable"
|-
|
Fortran style pseudo code
<!-- javascript syntax color works well for pseudocode -->
<syntaxhighlight lang="Fortran">
program fizzbuzz
Do i = 1 to 100
    set print_number to true
    If i is divisible by 3
        print "Fizz"
        set print_number to false
    If i is divisible by 5
        print "Buzz"
        set print_number to false
    If print_number, print i
    print a newline
end do
 
</syntaxhighlight>
 
||
Pascal style pseudo code
<!-- javascript syntax color works well for pseudocode -->
<syntaxhighlight lang="Pascal">
procedure fizzbuzz
For i := 1 to 100 do
    set print_number to true;
    If i is divisible by 3 then
        print "Fizz";
        set print_number to false;
    If i is divisible by 5 then
        print "Buzz";
        set print_number to false;
    If print_number, print i;
    print a newline;
end
 
</syntaxhighlight>
 
||
C style pseudo code:
 
<!-- javascript syntax color works well for pseudocode -->
<syntaxhighlight lang="C">
void function fizzbuzz
For (i = 1; i<=100; i++) {
    set print_number to true;
    If i is divisible by 3
        print "Fizz";
        set print_number to false;
    If i is divisible by 5
        print "Buzz";
        set print_number to false;
    If print_number, print i;
    print a newline;
}
</syntaxhighlight>
 
|}
 
{{Category see also|Articles with example pseudocode}}
 
==Mathematical style pseudocode==
In [[numerical computation]], pseudocode often consists of [[mathematical notation]], typically from [[set theory|set]] and [[matrix (mathematics)|matrix]] theory, mixed with the control structures of a conventional programming language, and perhaps also [[natural language]] descriptions. This is a compact and often informal notation that can be understood by a wide range of mathematically trained people, and is frequently used as a way to describe mathematical [[algorithm]]s. For example, the sum operator ([[capital-sigma notation]]) or the product operator ([[capital-pi notation]]) may represent a for loop and perhaps a selection structure in one expression:
<code>Return</code> <math>\sum_{k\in S} x_k</math>
 
Normally non-[[ASCII]] [[typesetting]] is used for the mathematical equations, for example by means of [[TeX]] or [[MathML]] markup, or proprietary [[formula editor]]s.
 
Mathematical style pseudocode is sometimes referred to as [[pidgin code]], for example ''pidgin [[ALGOL]]'' (the origin of the concept), ''pidgin [[Fortran]]'', ''pidgin [[BASIC]]'', ''pidgin [[Pascal (programming language)|Pascal]]'', ''pidgin [[C (programming language)|C]]'', and ''pidgin [[Lisp (programming language)|Lisp]]''.
 
==Machine compilation of pseudocode style languages==
 
===Natural language grammar in programming languages===
Various attempts to bring elements of natural language grammar into computer programming have produced programming languages such as [[HyperTalk]], [[Lingo (programming language)|Lingo]], [[AppleScript]], [[SQL]], [[Inform]] and to some extent [[Python (programming language)|Python]]. In these languages, parentheses and other special characters are replaced by prepositions, resulting in quite talkative code. These languages are typically [[Dynamic typing|dynamically typed]], meaning that variable declarations and other [[boilerplate code]] can be omitted. Such languages may make it easier for a person without knowledge about the language to understand the code and perhaps also to learn the language. However, the similarity to natural language is usually more cosmetic than genuine. The syntax rules may be just as strict and formal as in conventional programming, and do not necessarily make development of the programs easier.
 
===Mathematical programming languages===
An alternative to using mathematical pseudocode (involving set theory notation or matrix operations) for documentation of algorithms is to use a formal mathematical programming language that is a mix of non-ASCII mathematical notation and program control structures. Then the code can be parsed and interpreted by a machine.
 
Several formal [[specification language]]s include set theory notation using special characters. Examples are:
* [[Z notation]]
* [[Vienna Development Method]] Specification Language (VDM-SL).
 
Some [[array programming languages]] include vectorized expressions and matrix operations as non-ASCII formulas, mixed with conventional control structures. Examples are:
* [[APL (programming language)|A programming language]] (APL), and its dialects [[APLX]] and [[A+ (programming language)|A+]].
* [[MathCAD]].
 
==== Alternative forms of pseudocode ====
Since the usual aim of pseudocode is to present a simple form of some algorithm, using a language syntax closer to the problem domain{{example needed}} would make the expression of ideas in the pseudocode simpler to convey in those domains.
 
==See also==
* [[Concept programming]]
* [[DRAKON|Drakon-chart]]
* [[Flowchart]]
* [[Literate programming]]
* [[Program Design Language]]
* [[Short Code]]
* [[Structured English]]
 
==References==
* Justin Zobel (2004). "Algorithms" in ''Writing for Computer Science'' (second edition). Springer. ISBN 1-85233-802-4.
==External links==
{{Wiktionary}}
*[http://www.csc.calpoly.edu/~jdalbey/SWE/pdl_std.html A pseudocode standard]
*[http://calgo.acm.org/ Collected Algorithms of the [[Association for Computing Machinery|ACM]]]
*[http://www.cs.cornell.edu/Courses/cs482/2003su/handouts/pseudocode.pdf Pseudocode Guidelines], PDF file.
*[http://www.coderookie.com/2006/tutorial/the-pseudocode-programming-process/ Pseudocode Programming Process] base on data from Code Complete book
*[http://www.gnstudio.com/open-source/apdt/ Pseudocode generation tool] from a model tree learn how to generate pseudocode in a second
 
[[Category:Articles with example pseudocode]]
[[Category:Source code]]
[[Category:Algorithm description languages]]

Latest revision as of 04:25, 7 January 2015

There are free versions of antivirus software packages out there (plus some free trials) that are worth hunting into. AVG has both free and paid versions of their antivirus software, as Does PCTools. To find more, do a look for 'free anti virus software' and you will find hundreds of results. But remember the old adage: There's no such thing as a free lunch.

Avast is moreover a quite good Free Anti-Virus program to employ but I just used it when plus it was a little whilst back so I don't remember too much regarding it. Has anybody else used it and could supply a review for visitors?

Norton antivirus software reviews for Windows 7 is a fairly complex anti virus program. It may prevent all of these issues plus more. The ideal piece of all is that this system runs found on the Windows 7 platform. Windows 7 offers the easiest installation plus utilize for all programs.

What about Avast! Avast! has 2 different versions, a free variation and one we can buy for a annual price of $19.99. While free programs don't provide you help, Avast! does have email help, unheard of? Happening plus it could be happening with additional free software soon however for the time being Avast! is the only 1 providing support for their free software.

There is a continuous discovery of hot virus, Trojans, worms plus malware. This makes it necessary for a wise antivirus to have constant updates. The right really provide online changes many times a day. This assists to keep the software up to date in its ability to give protection against the newest threats. Updates should be done fast and smoothly.

Pair these 2 programs with MSE plus you are wise to go! I use this setup and I usually tell we it functions with flying colors. Read under for my personal testimonial of MSE plus what it has performed for me.

Having an anti-virus program added to the computer is a smart choice. In lifetime everything gets protected; homes, cars plus workplace spaces. So not protecting the computer while you surf the web is foolish. Utilizing the web safely plus feeling good regarding it entails buying a software program plus adding it to the computer. For any issues you are able to always access their free support 24 hour contact numbers, thus there is always aid at hand when you require it. With the aspects you do online, from banking to loading individual files plus images, ensuring that information is safe is crucial.