Category:CLP
CLP is an acronym for Control Language Program.
Much of what we find in CLP programs are IBM Commands. [1] Also see CLP Coding Rules and Category:Commands.
As with many other languages, there are multiple versions in popular usage, such as CLP/400 and ILE-CLP.
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
Some 400 commands can ONLY be executed from within a CLP program, not from Command Line. In other programming languages, these might be called OP CODES.
Special characters
Some characters have special meaning in CL:
| Symbol | Meaning |
|---|---|
| || | *CAT |
| |> | *BCAT |
| |< | *TCAT |
| = | *EQ |
| > | *GT |
| < | *LT |
| >= | *GE |
| <= | *LE |
| ¬= | *NE |
| ¬> | *NG |
| ¬< | *NL |
| & | *AND |
| | | *OR |
| ¬ | *NOT |
Ref: CL Programming, Expressions in CL commands
ILE/CL Built-in Functions
Like RPG, ILE/CL also supports many built-in functions. These would typically be used in CHGVAR and/or IF statements to manipulate variable data before its subsequent use. Initially, ILE/CL offered the following built-in functions.
| Function | - | %BINARY or %BIN | - | %SUBSTRING or %SST | - | %SWITCH | }
Pointer useAs 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:
These are immediate PTFs, but you will need to re-compile any CL programs using pointers in order to get the issues fixed. 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 getenv from a thread on RPG400-L. dcl &pNull *ptr /* Auto-initialized to *null */ if ( &pEnvVar *eq &pNull ) do Note: As of V6R1 of the operating system, complete *NULL support was added to ILE CL encompassing the DCL, IF, and CHGVAR statements. Categories |
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Pages in category "CLP"
The following 12 pages are in this category, out of 12 total.
