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| − | {{AN}} is an acronym for {{bu|C|ontrol}} {{bu|L|anguage}} {{bu|P|rogram}}.
| + | #REDIRECT [[:Category:CLP]] |
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| − | Much of what we find in CLP programs are IBM Commands. [http://wiki.midrange.com/index.php/Category:Commands] Also see [[CLP Coding Rules]] and [[:Category:Commands]].
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| − | As with many other languages, there are multiple versions in popular usage, such as [[CLP/400]] and [[ILE-CLP]].
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| − | In some realities, this is comparable to software that is the "glue" connecting higher level language programs like [[:RPG]]; data base files and their over-rides; screen and print "files" and their over-rides; and other objects with Menus ... typically when we take a menu option, we are launching a CLP program.
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| − | == CLP Unique Commands ==
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| − | Some 400 [[:Category:Commands | commands]] can ONLY be executed from within a CLP program, not from [[Command Line]]. In other programming languages, these might be called OP CODES.
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| − | * [[PGM]] (Program)
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| − | * [[ENDPGM]]
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| − | * [[DCL]] (Declare Variable)
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| − | * [[IF]]
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| − | * [[ELSE]]
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| − | * [[DO]]
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| − | * [[ENDDO]]
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| − | * [[GOTO]]
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| − | * [[MONMSG]]
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| − | == Special characters ==
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| − | Some characters have special meaning in CL:
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| − | {| class="wikitable" border="1"
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| − | ! Symbol !! Meaning
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| − | |-
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| − | | align="center"|<nowiki>||</nowiki> || *CAT
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| − | |-
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| − | | align="center"|<nowiki>|></nowiki> || *BCAT
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| − | |-
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| − | | align="center"|<nowiki>|<</nowiki> || *TCAT
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| − | |-
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| − | | align="center"|<nowiki>=</nowiki> || *EQ
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| − | |-
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| − | | align="center"|<nowiki>></nowiki> || *GT
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| − | |-
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| − | | align="center"|<nowiki><</nowiki> || *LT
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| − | | align="center"|<nowiki>>=</nowiki> || *GE
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| − | | align="center"|<nowiki><=</nowiki> || *LE
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| − | | align="center"|<nowiki>¬=</nowiki> || *NE
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| − | | align="center"|<nowiki>¬></nowiki> || *NG
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| − | | align="center"|<nowiki>¬<</nowiki> || *NL
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| − | | align="center"|<nowiki>&</nowiki> || *AND
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| − | |-
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| − | | align="center"|<nowiki>|</nowiki> || *OR
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| − | |-
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| − | | align="center"|<nowiki>¬</nowiki> || *NOT
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| − | |}
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| − | Ref: CL Programming, Expressionsin CL commands
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| − | == Pointer use ==
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| − | As of V5R4, CL allows the use of pointers. There were some problems with uninitialised pointers, and PTFs were issued. As of 15 Feb 2008, 5722-SS1:
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| − | * SI28620
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| − | * SI28196
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| − | * SI27953
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| − | These are immediate PTFs, but you will need to re-compile any CL programs using pointers in order to get the issues fixed.
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| − | One can't compare a pointer to *NULL, but a clever idea is to create an unused pointer (which will be set to *NULL if the above PTFs are applied) and compare to that. Here is a snippet from Tom L. for a CL program that performs [http://code.midrange.com/1509e4633a.html getenv] from a thread on [http://archive.midrange.com/rpg400-l/200802/msg00248.html RPG400-L].
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| − | dcl &pNull *ptr /* Auto-initialized to *null */
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| − | if ( &pEnvVar *eq &pNull ) do
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| − | ==Categories==
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| − | [[Category:Programming languages]]
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| − | [[Category:CLP|*]]
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