CLP Coding Rules

Coding rules for CLP Commands

These rules apply both on Command Line and inside a CLP program.

Blank space separates parts of a command
- Example WRKOUTQ QFISCAL* to get at list of all OUTQ whose name starts with QFISCAL
Parentheses go around keywords and values
- Example SAVLIB LIB(XFILES) DEV(TAP01)
Slash connects parts of a qualified name or path name
- Example WRKOBJ XFILES/UFOS
Single apostrophe indicates beginning and end of a quoted character string (a constant)
- Example SNDMSG MSG('Intruder Alert') TOUSR(QBOSS)
*N is a place holder (take the defaults) indicating the absense of a positional parameter
- Example RUNQRY *N LOG
Predefined values begin with an asterisk and indicate IBM-defined values which are reserved by OS/400 and may be used in programs to have those set functions
- Example SAVLIB LIB(*ALLUSR) DEV(*SAVF)
Generic name contains one or more characters that are those that start some object(s) then end in asterisk to signify wild card list of all that share that prefix
- Example DSPF*

Variable name has ampersand & followed by up to 10 characters (11 total), used to store and update data and to receive parameters, as temporary storage while program is running
Colon : ends a command label
- Example LABEL:
/* at beginning and */ at end of comment lines
plus sign at end of line(s) that need to go to another line, when the next character is non-blank (F4 gets it perfect)
minus sign at end of line(s) that need to go to another line, when the next character period (F4 gets it perfect)

Except for comment lines
CLP program begins with PGM Program command and ends with ENDPGM End Program command
- ENDPGM is safety to make sure we have all of the source code
Right after PGM is the DCL declaration section where we define the variables that will be used in the rest of the program

DCL VAR(Variable Name) TYPE(*CHAR) LEN(Lengthe) VALUE(Initial Value)

Variable Name must start with ampersand (&) followed by up to 10 characters (11 total maximum)
Length of character field
- 1 minumum
- 9999 maximum
- 32 default