Talk:Procedural programming: Difference between revisions

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== "Procedural" v. "Imperative" (merge?) ==

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Why does this article include this tag?

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This article should be merged with imperative programming.

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[[Procedural programming]] and [[Imperative programming]] are orthogonal concepts, and can be best left on their own. [[User:Bevo|Bevo]] 19:16, 14 Feb 2004 (UTC)

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:I've just grabbed a couple of sentences from FOLDOC to explain why. -- [[User:Kowey|Kowey]] 11:06, 3 Apr 2004 (UTC)

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::The distinction seems to be quite subtle, and could be clearer. I for one don't understand it ;). Could we say that Procedural programming describes a set of rules that are also common `design guidelines' in other paradigms, like for example imperative programming? Obviously breaking up a program in modules and having scoping rules is something common in imperative programming. --[[User:Raboof|Raboof]] 12:22, 13 Apr 2005 (UTC)

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:::I can't pretend that I fully understand the definition either, but it would appear that procedural programming describes something which is so embedded in programming styles that it's taken for granted. Imperative languages divide their code up into files (C), or classes (C++, Java); some functional languages divide the code up into modules (Haskell, SML) and classes (OCaml) for the same reason. I assume logic programming languages do something very similar. Surely only the very simplest programs written nowadays are in the form of one monolithic main() method! :) [[User:129.215.13.84|129.215.13.84]] 28 June 2005 16:49 (UTC)

: [[User:PJTraill|PJTraill]] 18:05, 7 May 2006 (UTC) See my comment under Procedural v. Declarative (18:00, 7 May 2006)

:Traditionally, "procedural programming" is pretty much synonymous with "imperative programming" in that it refers to programs being "recipes" for the steps to be performed, as opposed to "implicit", "goal-oriented", "constraint-based", or "requirements-based" programming wherein the functional requirements and constraints are specified and the language implementation itself devises the steps to satisfy the requirements. — [[User:DAGwyn|DAGwyn]] 19:52, 18 June 2007 (UTC)

:I think an assembly language program would be imperative, but might not be procedural. So don't merge as they are different concepts. But any 3GL which is imperative should also be procedural. [[User:Aarghdvaark|Aarghdvaark]] ([[User talk:Aarghdvaark|talk]]) <small>—Preceding [[Wikipedia:Signatures|comment]] was added at 22:49, 24 December 2007 (UTC)</small><!--Template:Undated--> <!--Autosigned by SineBot-->

::I agree that the distinction is subtle, and that assembly language programs are imperative but not procedural but that if the language has procedures (i.e., [[void type|void]] or [[unit type]] functions, it qualifies as procedural. Generally, imperative programming is a paradigm based upon statements and statement types with sequencing, whereas procedural programming is based upon function application with "no return value", i.e., procedure calls. (In functional programming, that should properly be unit type.)

::I think high-level imperative programming languages are ''de facto'' procedural because AFAIK they all include function application, but there are imperative '''features''' that are not intrinsically related to functions. For example, associated features of a programming language such as mutable state, especially assignment, are also referred to as "imperative" in programming language parlance, but I don't think these are necessarily procedural features. [[User:Banazir|Banazir]] ([[User talk:Banazir|talk]]) 22:59, 21 April 2010 (UTC)

==Rewrite==

Hopefully this clarifies the distinction between the procedural and imperative programming paradigms, and hopefully my understanding of these concepts is reasonably accurate. Revisions, clarifications, and corrections are welcome... -- [[User:Beland|Beland]] 07:07, 11 July 2005 (UTC)

: I think you did a good job, but there are still some ambiguous points, such as the implication of the following statement: "Procedural programming can sometimes be used as a synonym for imperative programming (specifying the steps the program must take to reach the desired state), but can also refer (as in this article) to a programming paradigm, derived from structured programming, based upon the concept of the procedure call." [[Imperative programming]] is itself identified as a programming paradigm as well, and here it reads as if procedural programming is a paradigm but not necessarily imperative programming. I suggest something that sets procedural programming apart as its own paradigm, either a strict subset of imperative programming or "typically a subset save in boundary cases". -- [[User:Banazir|Banazir]] ([[User talk:Banazir|talk]]) 23:03, 21 April 2010 (UTC)

== Procedural Programming subset of OO? ==

Is procedural programming a subset of object-oriented programming? Seems to me that all OO languages are procedural as well. Is it possible to be OO without being procedural? If not, then this should be mentioned in the main article under the section on OO. --[[User:Andrew Eisenberg|Andrew Eisenberg]] 19:05, 31 August 2005 (UTC)

OO programming is a subset of procedural programming, the opposite is incorrect. So it's not possible to be oo without being procedural but it's possible to be procedural without be OOP.

:What about OCaml? Lisp can be used in an object-oriented manner as well.

"Pure" object-oriented languages have encapsulation to a degree which forbids certain aspects of procedural programming, such as calling a function from any point in the program or referencing global variables without a registry. In this respect, I think it is appropriate to consider OOP as not a superset of procedural programming, but rather a separate style. Another consideration is the compiled result: Does an Objective-C program compile to objects, or are these merely abstractions for bundles of procedural or imperative assembler in the mind of the programmer? [[Special:Contributions/216.19.189.159|216.19.189.159]] ([[User talk:216.19.189.159|talk]]) 10:52, 6 June 2008 (UTC)

==Procedural vs. Declarative==

The concept of procedural languages is used to contrast with declarative languages. Some languages have features of both, such as LISP or other functional languages (which are not primarily declarative as the declarative language article states). The difference is procedural describes "what" a program does and "how" it does it. Declarative simply states the form of what is expected (Logic-based programming). I would suggest someone clean this up and add it/ edit this article (I have never done so, and don't know if I should dare make this my first). More detailed information can be found in Concepts of Programming Languages by Robert W. Sebesta.

OO being a subclass of procedural is a tough call. It is certainly more procedural than declarative, but OO describes a different set of ideas than procedural or declarative. (abstraction, inheritance...etc..) It seems possible that there could be an OO logic-based language, so I would say OO is not only procedural.

Also, the opening statement includes: functions should not be confused with mathematical function, seems wrong. They should be confused / thought of as nearly the same. I am sure there is article on here further detailing this: given input a function produces a single output. -has

:[http://www.cs.chalmers.se/~nordland/ohaskell/ O'Haskell] is an example of a ''technically'' non-procedural OO language. The non-proceduralness is buried under a lot of syntactic sugar, but it's there. ML and Lisp are both functional languages where the functions can have side effects, which makes them distinct from mathematical functions. [[User:Gazpacho|Gazpacho]] 04:52, 27 October 2005 (UTC)

::What are these side-effects? In Common LISP and other versions sure there are side-effects, and in fact there are many things which make Lisp actually imperative. However, in pure Lisp, which is a true functional language, then I can not think of any side-effects. When you use a subroutine to simply return a single value, then it is considered a function. The term function is not defined by what languages have made functions and then expanded to make something different than functions. It is a term in programming originated from subroutines that are true functions, as in like mathematical functions. Programming languages on computers are no stronger than recursively enumerable langauges which can be enumerated according to recursive functions, which are highly "mathematical". Basically, I am saying every program could be written as a set of mathematical functions (it may be a huge list of them, but it is possible - you learn this in the study of formal languages). -has

:If you consider "Lisp" as a Platonic ideal, you can make it have whatever properties you like. But real Lisp allows side effects and Lisp programmers routinely make use of them. Therefore the mathematical functions in a typical Lisp program do not line up with the language's functions. [[User:Gazpacho|Gazpacho]] 05:38, 27 October 2005 (UTC)

:I think the previous poster meant to say [[Lambda Calculus]], not pure lisp, which I am not aware of actually existing. However, if we limit discussion on this page to languages that are ''only'' declarative, then we are looking at a very small set, indeed (lambda calculus,...). More interesting, I think, are the languages which are ''practically'' declarative (which includes the lisp variants, etc.).

:That being said, if you, -has, have a way to improve the article, then by all means do so. You can start by placing your changes here and I (and hopefully others) will comment on them. If they are good suggestions, then they will be adopted, but even if they're not, it might lead to something better. --[[User:Andrew Eisenberg|Andrew Eisenberg]] 21:46, 27 October 2005 (UTC)

: [[User:PJTraill|PJTraill]] 18:00, 7 May 2006 (UTC) Surely the usual dichotomy is between "declarative" + "imperative". I have indicated that "procedural" may mean "using procedures" or "imperative", and think it reasonable that this article describe only the former sense. Or is there a third sense of "procedural"?

== Efficiency Claim ==

There was an efficiency claim under "Comparison with object-oriented programming" that I removed. There are two reasons I did this.

# The claim is a generalization without a reliable source.

# The claim is actually false.

From ''Effective STL'' by Scott Meyers, p.203:

:"The fact that function pointer parameters inhibit inlining explains an observation that long-time C programmers often find hard to believe: C++'s sort virtually always embarrasses C's qsort when it comes to speed. Sure, C++ has function and class templates to instantiate and funny-looking operator() functions to invoke while C makes a simple function call, but all that C++ "overhead" is absorbed during compilation. At runtime, sort makes inline calls to its comparison function while qsort calls its comparison function through a pointer. The end result is that sort runs faster. In my tests on a vector of a million doubles, it ran up to 670% faster, but don't take my word for it, try it yourself. It's easy to verify that when comparing function objects and real functions as algorithm parameters, there's an abstraction ''bonus''." (parenthetical statement removed, italics in original)

If you disagree and have a better source than Meyers, I'd be very interested to "talk shop" about this. :-) Cheers. /* [[User:PradeepArya1109|Pradeep Arya]] 09:33, 11 January 2006 (UTC) */

::I disagree. You're arguing for generic programming, not OOP. Generics in C give the same speed. -- Anon March 5

===Proof of efficiency===

Think in a single program with just one function (hello world for example). Mission :the program must call this funtion once then close. It's only a illustrative example but it can be extrapoled for a more complex sample if you are please to.

[[With PP:]]

You must create the function then call it, then return the result and finish the program.

[[With OOP:]]

You must create a class with the unique function, the instance the object of this class, then call this object. Next, you must return the result, then must destroy the object and finish the program.

The resource spend and speed are clear, also you can see a tendency.

--[[User:Magallanes|Magallanes]] 14:58, 11 September 2006 (UTC)

== C# and Java as Procedural Languages ==

The fact that C# is included in the list of procedural programming languages but Java is omitted. It seems to me that the only support both languages have for procedural programming is made possible through the class construct, which is an inherently object oriented construct. While I'm not sure I want to start a war over whether this support is enough to consider the languages procedural, I would think that given their similarities, either both should be included or both should be omitted. For now, I've added Java, but I think this might warrant more discussion. [[User:Mrtrumbe|Taft]] 20:03, 3 March 2006 (UTC)

: [[User:PJTraill|PJTraill]] 17:53, 7 May 2006 (UTC) I've extracted both from the list, added a criterion for this, mentioned both there, left C++ in with minor changes to the comment.

:I do not think classes is inherently object oriented. What if I make a C# or Java -program consisting solely of static methods? Would you call that an object oriented program? It would essentially be like programming in C. Thus C# and Java supports procedual programming. [[User:195.7.30.16|195.7.30.16]] 14:10, 26 October 2007 (UTC)

== Comparison with object-oriented programming ==

I would like to see less of the editorial slant in favor of OOP in that topic.

For example,

instead of using phrases like "it's undeniable that OOP is better at"

please use phrases like "Many people believe that OOP is better at".

Also, I would like to see some more information about how procedural programming

can be superior to OOP.

== Procedural Programming != Procedural Generation ==

Spore is listed in the [[Procedural_programming#Games]] section. I suppose that the person who added it was as confused as the rest of the world regarding the term [[Procedural programming]], often (ab)used to describe Spore's unique content. In fact, the correct term is [[Procedural generation]], which is what Spore does. I know that a lot of people refer to that as Procedural Programming nowadays, but that's just incorrect. (Not that I care, it's just hilarious when it results in articles such as [http://www.bonafidereviews.com/article.php?id=224 these])

Now, I'm not going to remove this right now, I want to discuss this first. The thing is, the whole section being there doesn't make sense. [[Elite]], [[Quake]], [[Quake 2]], [[Quake 3]] and of course [[Spore]] are all written in an [[Object oriented programming]] language. If anything belongs in there it's.. oh I don't know.. Pac-Man? --[[User:Shadowcode|<span style="font-variant:Small-caps;color:black;text-decoration: none">ShadowCode</span>]] 20:47, 5 August 2007 (UTC)

:*edit* One more thing. The reason why everyone is saying procedural programming while they mean procedural generation is because some PR idiot at EA has been using that term to describe Spore. And you know, the press just takes it over and sooner or later everyone is talking about procedural programming. Gotta love hype and the buzzwords it generates, 'eh? --[[User:Shadowcode|<span style="font-variant:Small-caps;color:black;text-decoration: none">ShadowCode</span>]] 21:00, 5 August 2007 (UTC)

:I created the "List of Popular Software written using Procedural Programming" section because I was interested in knowing if ANY popular programs nowadays were written in a procedural programming style ( research ). I could not find such a list on the internet and thouht this would be a great place to put it. Personally, I can only list very few popular programs written using procedural programming. Yes, I listed [[Quake]], [[Quake 2]], [[Quake 3]] because they ARE written in C using a procedural programming style. Source code for all those games are available online.--[[User:24.8.150.120|24.8.150.120]] 23:55, 14 August 2007 (UTC)<blockquote>

Someone already removed Spore (altough for pretty much the wrong reason. Oh well.) --[[User:Shadowcode|<span style="font-variant:Small-caps;color:black;text-decoration: none">ShadowCode</span>]] 09:01, 6 August 2007 (UTC)

:I have removed Spore because it isn't a popular game yet.

: I've removed it once, because there exists no sort of sources on the claim. Until such a source exists, putting it there is pressuming something very unlikely. Presuming in general isn't very much in the spirit of Wikimedia. [[User:or-whatever]] ([[User talk:or-whatever|talk]]) 11:27, 19 August 2008 (UTC)

== List of Popular Software? ==

The list of software seems to be way too bloated, unmaintained (it's not even properly capitalized), and pretty much unnecessary. I suggest either a clean-up or a complete removal of the "example software" section.

I guess I'll do it myself if no objections pop up. <small>—[[User:Sykopomp|Sykopomp]] ([[User talk:Sykopomp|talk]] • [[Special:Contributions/Sykopomp|contribs]]) 05:45, 5 October 2007 (UTC)</small><!-- Template:Unsigned --> <!--Autosigned by SineBot-->

:I object to your removal of the section. I put it in there for research purposes. You are welcome help edit the section. <small>—Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/24.8.200.98|24.8.200.98]] ([[User talk:24.8.200.98|talk]]) 07:24, 21 October 2007 (UTC)</small><!-- Template:UnsignedIP --> <!--Autosigned by SineBot-->

:I have edited the section because some people confuse procedural programming with procedural generation.

:Also, there is no proof, that I could find, that some of the programs listed were written using procedural programming.

:(Quake and Doom sources are widely available and written using C.) <small>—Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/24.8.200.98|24.8.200.98]] ([[User talk:24.8.200.98|talk]]) 07:48, 21 October 2007 (UTC)</small><!-- Template:UnsignedIP --> <!--Autosigned by SineBot-->

::I believe that this section ought to be removed as well. The list has little to do with procedural programming itself and is woefully incomplete, seeing as it should include pretty much every C program in existence. Perhaps notable instances of procedural programming should be added to prose sections where they add to the article, or a list of procedural languages used instead, but a list of programs written using procedural programming doesn't seem particularly useful or relevant. [[User:CapitalSasha|''C''apital''S''asha]] ~ <small>[[User talk:CapitalSasha|''t''alk]]</small> 05:50, 6 December 2007 (UTC)

:::The "Popular Software" list is useful and relevant because it gives the reader some examples of programs written using the procedural programming style. "Popular" was chosen to keep the lists contents short.--[[Special:Contributions/75.71.71.76|75.71.71.76]] ([[User talk:75.71.71.76|talk]]) 18:20, 23 December 2007 (UTC)

::: I reckon it is pretty useless, as they could just as well have been written in different paradigms. The user sees the function, not the technique. A reference to source would be more relevant. [[User:PJTraill|PJTraill]] ([[User talk:PJTraill|talk]]) 22:39, 16 April 2008 (UTC)

:::: I think it has a great purpose of providing the reader with some examples of popular programs written using a procedural style. This is great for such things as knowledge and research.

: The list should be removed. To me it looks like an advertisement for these particular software. I would much rather prefer to see the use of procedural programming in general being mentioned somewhere in the text. // [[User:Fulkkari|Fulkkari]] ([[User talk:Fulkkari|talk]]) 07:41, 11 May 2008 (UTC)

:: The list is suppose to give the reader some popular examples of programs written using procedural programming. Most of the software listed is available as open source. This way the reader can see some examples of programs written using the procedural programming style. Yes, this whole list is an advertisement for procedural programming! Yes, the reader can actually see some GOOD examples of procedural programs that have actually worked in the real world -despite some false reasonings by some in the OOP community that procedural programming leads to unproductive spaghetti code. --[[Special:Contributions/76.25.205.169|76.25.205.169]] ([[User talk:76.25.205.169|talk]]) 21:50, 15 May 2008 (UTC)

: I have a note on this too. What is Spore doing in that list? If it's programmed using a procedural language, there should at least be a reference. Though my guess is that it's not, because very few big game productions are made with procedural languages these days, and why would a team, who have never made games in anything but OO languages, suddenly change it? Besides, handling all that user created content would be a lot easier in an OO lanugage, than in a procedural one. My guess is that someone has misunderstood the term Procedural Generation (game content being generated procedurally by the players), for being programmed with a procedural language. I may be wrong though? [[User:Or-whatever|Or-whatever]] ([[User talk:Or-whatever|talk]]) 01:15, 17 August 2008 (UTC)

I've removed the section, and it sounds to me like I'm not going to have many objections. (To be honest, I'm surprised it hasn't been done yet.) There is simply way too much software written in languages like C to be able to fit into a list. If items on the list are truly notable, they should be incorporated into the article body. If such a list is to exist at all, it should be in its own article, not here. — [[User talk:FatalError|^{<span style="color:#900;">Fatal</span>}]][[Special:Contributions/FatalError|<small><span style="color:#e00;">Error</span></small>]] 00:25, 25 September 2008 (UTC)

== Comparison with object-oriented programming ==

The table in the comparison with object-oriented programming section describes the difference in idioms between pure OO and pure procedural programming, not the difference in features, as both have functions, both have variables, and so forth. In OOP a message is information sent to a method, just as in PP, an argument is information sent to a function. Therefore the proper mate for "message" under the OO paradigm in this table is "argument." A "function call" is not information sent to a function, but rather the instantiation of the function itself, much as an object is not a class, but an instantiation of the class itself. <small>—Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[User:Max42|Max42]] ([[User talk:Max42|talk]] • [[Special:Contributions/Max42|contribs]]) 23:02, 6 June 2008 (UTC)</small><!-- Template:Unsigned --> <!--Autosigned by SineBot-->

== This sentence is not a reason ==

Comment about this sentence: "Procedural programming languages are also imperative languages, because they make explicit references to the state of the execution environment."

It might (perhaps) help someone like me reading this if "execution environment" were actually defined. It is used twice in this article (at the time of writing this) without being defined or explained.

How does making "explicit references to the state of the execution environment" make a language an imperative one? Earlier in the article, it is suggested that imperative langauages specify the steps the program must take to reach the desired state. That makes sense. Specifying what must happen chimes with the word "imperative". Making "references to the state of" something (something that isn't even defined) doesn't make sense as a reason, and is very abstract and confusing. Even if "execution environment" were clearly defined, the above sentence is most probably not an explanation why "Procedural programming languages are also imperative languages".

[[Special:Contributions/109.145.82.159|109.145.82.159]] ([[User talk:109.145.82.159|talk]]) 17:23, 19 August 2011 (UTC)

<span style="font-size: smaller;" class="autosigned">— Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/109.145.82.159|109.145.82.159]] ([[User talk:109.145.82.159|talk]]) 17:17, 19 August 2011 (UTC)</span><!-- Template:Unsigned IP --> <!--Autosigned by SineBot-->

== Module object equivalence ==

There's nothing dubious at all about this. A module is a collection of shared state (stored in module-level globals) combined with a set of functions that operate on that state. An object (in the sense of class instance) is a collection of shared state (stored in 'self') combined with a set of functions that operate on that state (i.e. methods). The only really substantial difference between the two is that -- generally -- modules can only be instantiated once, while there can be multiple instantiations of the same class. If no one disputes this, I'm deleting this tag. [[Special:Contributions/72.228.33.213|72.228.33.213]] ([[User talk:72.228.33.213|talk]]) 18:23, 15 September 2011 (UTC)

:The multiplicity difference is not a minor point; modules are thus much more akin to classes. I've edited the article to make better comparisons. --[[User:Cybercobra|<b><font color="3773A5">Cyber</font></b><font color="FFB521">cobra</font>]] [[User talk:Cybercobra|(talk)]] 03:58, 16 September 2011 (UTC)

== Totally screwed up ==

The definition given is in marked contrast to the definition here: http://encyclopedia2.thefreedictionary.com/procedural+language

That second definition is essentially the one I learned in college in the early 70s. I believe the entire article needs to be rewritten.

[[User:Danhicks|drh]] ([[User talk:Danhicks|talk]]) 19:46, 16 December 2012 (UTC)

I agree!! In the above link the first defination covers all procedural languages.

The clasic programming language COBOL first coined the expression procedural language. Its designers calling it a procedural programming language.

COBOL was designed as business language mainly for accounting and inventory controle applications. It is an acronym for COmon Business Orianted Language. There were other procedural languages. FORTRAN and ALGOL were called procedural languages.

Learning programming in the late 1960 I know that termonolgy has changed over years. This should be a place were people can find answers. Technology changes and termonolgy with it. A part of the problem is that programming is a vocation and computer science is an academic endeavor, or was when I was in collage. COBOL was tought as a vocation. It was fairly unique. Only one other language used a like control structure. The COBOL PERFORM statement was kand of a subroutine call. But it just made a section of code a subroutine. COBOL code was organized into paragraphs each starting with a lable. Say we have several code paragraphs labled in order: A B C D.

We can say:

PERFORM B THRU D. and in another say

PERFORM A THRU C.

The old COBOLs also used PERFORM as their loop operation

PERFORM F FOR J=1 TO 5.

Sorry if incorect syntax. It's been 40+ years sense I've seen COBOL. That first statement about using a call stack is impossable as several machines back then, that were designed for business application did not have registers.

I started programming in 1965. A lot of changes over those years. [[User:Steamerandy|Steamerandy]] ([[User talk:Steamerandy|talk]]) 01:49, 25 November 2018 (UTC)

== Irrelevant: Java the 1st major OP language. ==

There is, in the section comparing the paradigm with OO, a claim, recently tagged with {{template|citation needed}}, that Java is the 1st major OP language. I would be inclined to remove this assertion completely, as it is somewhat tendentious and not illuminating in the context of the comparison. Does anyone feel differently? [[User:PJTraill|PJTraill]] ([[User talk:PJTraill|talk]]) 00:59, 27 November 2018 (UTC)