IBM AS/400 manual For Further Information, Main Procedures, Subprocedures

		For	Further Information
The automatic storage that is		associated		with	earlier		invocations
by later invocations. All	invocations share			the	same	static storage,
cations can affect the	value	held by	a	variable		in	static stora

Recursion can be a powerful programming technique when properly und stood.

¹The run-time behavior of a subprocedure differs somewhat from tha

procedure, because there is no cycle code for the subprocedur

–When a subprocedure ends, it simply returns to the caller. None usual termination activities, such as closing of files, occurs un procedure that is associated with the subprocedure itself en code a "cleanup" subprocedure that is called both by the pr procedure at application-end, and by a cancel handler enabled program entry procedure.

An alternative is to code the NOMAIN module so that there is n opening or data area locking, and that within any subprocedure, matched by a close, an IN by <antempOUT,obj>a byCRT <atempDLT

obj>, and so on. This alternative applies to modules that may h procedure active when the main procedure is not active.

– Exception handling within a subprocedure differs from a main pro primarily because there is no default exception handler for s As a result, situations where the default handler would be ca procedure correspond to abnormal end of the subprocedure.

For Further Information

To find out more about the topics discussed here, consult the follo

Main Procedures

Topic	See
Exception handling	“Exception	Handling	within a Main Procedure” on
	page 220
Main Procedure End	“Returning	from a	Main Procedure” on page 152

Subprocedures

Topic		See
Defining		Chapter		on	subprocedures,ILEin		RPGthe for AS/400
		Reference
NOMAIN module		“Creating a NOMAIN Module” on page 75
Exception	handling	“Exception Handling within Subprocedures” on
		page	221
Procedure	Specification	Chapter		on	procedure specifications,ILE RPGin forthe
		AS/400	Reference
Procedure	Interface	Chapter		on	defining data and		prototypesILE	in the
		RPG	for	AS/400		Reference
Subprocedure	End	“Returning			from	a Subprocedure” on page 154

Chapter 4. Creating an Application Using Multiple47 Procedures