OPERATION CODE SUMMARY


Table 5.2 lists RPG operations along with brief descriptions.

Table 5.2: Alphabetical List of Operation Codes

Op Code

Description

ACQ

Acquire a program device.

ADD

Add two values together.

ADDDUR

Add duration to a DATE, TIME, or TIMESTAMP value.

ALLOC

Allocate memory and runtime.

ANDxx

Extend IFxx, DOWxx, DOUxx, and WHENxx conditioning.

BEGSR

Begin a subroutine.

BITOFF

Set off individual bits with a field.

BITON

Set on individual bits with a field.

CABxx

Compare two values, then branch to a label.

CALL

Call another program.

CALLB

Call a bound-in procedure.

CALLP

Call with prototype.

CASxx

Compare two values, then call a subroutine.

CAT

Concatenate factor 1 to factor 2.

CHAIN

Random file access by index.

CHECK

Verify the data in factor 2 against factor 1 (from left to right).

CHECKR

Verify the data in factor 2 against factor 1 (from right to left).

CLEAR

Clear data structure, variable, or record format.

CLOSE

Close a file.

COMMIT

Commitment control, commit group.

COMP

Compare two values and set on/off resulting indicators.

DEFINE

Define one field like another field.

DEALLOC

Release memory back to the system at runtime.

DELETE

Delete a database record.

DIV

Divide two values.

DO

Begin DO loop with an optional counter.

DOU

Begin DO UNTIL loop using expression conditioning.

DOUxx

Begin DO UNTIL loop.

DOW

Begin DO WHILE loop using expression conditioning.

DOWxx

Begin DO WHILE loop.

DSPLY

Display a message at the workstation.

DUMP

Print a formatted dump.

ELSE

Else clause, used in conjunction with the IFxx operation.

ELSEIF

A combined ELSE and IF statement.

END

End a DO, DOWxx, DOUxx, CASxx, IFxx, or SELECT group.

ENDCS

End a CASxx group.

ENDDO

End a DO, DOWxx ,or DOUxx loop.

ENDFOR

End a FOR loop.

ENDIF

End an IFxx group.

ENDMON

End a MONITOR/ON-ERROR group.

ENDSL

End a SELECT group.

ENDSR

End of a subroutine.

EVAL

Evaluate an expression. Left justifies result for character expressions.

EVALR

Evaluate an expression. Right justifies result for character expressions.

EXCEPT

Write a program-defined or externally described record format.

EXFMT

Write, and then read, a workstation device.

EXSR

Call an intra-program subroutine.

EXTRCT

Extract a component of a DATE, TIME, or TIMESTAMP value.

FEOD

Cause a file "cursor" reset; free locked records.

FOR

Begin a FOR loop using expression syntax.

FORCE

Force input priority alteration.

GOTO

Perform an unconditional branch to a label.

IFxx

Compare two values and perform a block of code.

IN

Retrieve an external data area's data.

ITER

Iterate a DO, DOWxx, or DOUxx loop.

KFLD

Define a key field of a key list.

KLIST

Define a key list used to access an indexed file.

LEAVE

Leave a DO, DOWxx, or DOUxx loop.

LEAVESR

Leave the current subroutine and immediately return to its caller.

LOOKUP

Search an array or table for like or unlike elements.

MHHZO

Move high zone to high zone.

MHLZO

Move high zone to low zone.

MLHZO

Move low zone to high zone.

MLLZO

Move low zone to low zone.

MONITOR

Begin a block of code that is monitored for errors.

MOVE

Copy data, right-justified, from a field or constant to field.

MOVEA

Copy data, left-justified, to all successive array elements.

MOVEL

Copy data, left-justified, from a field or constant to a field.

MULT

Multiply two values.

MVR

Copy the remainder of a preceding division to a field.

NEXT

Force the next input cycle to read input from a specific device.

OCCUR

Set/get the occurrence of a multiple occurrence data structure.

ON-ERROR

Begin an error trap block of code.

OPEN

Open a file.

ORxx

Extend IFxx, DOWxx, DOUxx, and WHENxx conditioning.

OTHER

Otherwise clause of a SELECT/WHEN group.

OUT

Update an external data area.

PARM

Define a parameter field within a parameter list.

PLIST

Define a parameter list.

POST

Retrieve and post device-specific information to a data structure.

READ

Read from a file.

READC

Read next changed subfile record.

READE

Read the next data file record with equal key index.

READP

Read previous data file record.

READPE

Read previous data file record with equal key index.

REALLOC

Reallocate memory of a new size at runtime.

REL

Release an acquired program device.

RESET

Reset a variable to its initial value.

RETURN

Return to calling program.

ROLBK

Commitment control, roll back group.

SCAN

Scan argument for search pattern and return position.

SELECT

Begin an in-line SELECT/WHEN case group.

SETGT

Set the file cursor greater than the specified index.

SETLL

Set the file cursor less than the specified index.

SETOFF

Set an indicator off.

SETON

Set an indicator on.

SHTDN

Test for system shut down.

SORTA

Sort an array.

SQRT

Compute the square root of a number.

SUB

Subtract one value from another.

SUBDUR

  1. Subtract a duration from a DATE, TIME, or TIMESTAMP value.

  2. Calculate the duration between two DATE, TIME, or TIMESTAMP values.

SUBST

Copy substring value in factor 2 to the result field.

TAG

Define the location and name of a label.

TESTB

Test bit pattern.

TESTN

Test character field for numeric data.

TESTZ

Test the zone of the rightmost position of a field.

TEST

Test for a valid DATE, TIME, or TIMESTAMP value.

TIME

Retrieve the system time and date.

UNLOCK

  1. Unlock an external data area object.

  2. Unlock a database record.

UPDATE

Update a file.

WHENxx

When select condition is true, then do.

WRITE

Write to a file.

XFOOT

Cross foot (sum up) an array.

XLATE

Translate factor 2 using translate data in factor 1.

Z-ADD

Zero and add numeric.

Z-SUB

Zero and subtract numeric.




The Modern RPG IV Language
The Modern RPG IV Language
ISBN: 1583470646
EAN: 2147483647
Year: 2003
Pages: 156
Authors: Robert Cozzi

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