ILE RPG Language Reference
Procedure specifications are used to define prototyped procedures
that are specified after the main source section, otherwise known
as subprocedures.
The prototype for the subprocedure may be defined in
the main source section of the module containing the subprocedure
definition. If the prototype is not specified, the prototype is implicitly
defined using the information in the procedure interface. If the
procedure interface is also not defined, a default prototype with
no return value and no parameters is implicitly defined.
A subprocedure includes the following:
- A Begin-Procedure specification (B in position 24 of a procedure
specification)
- A
Procedure-Interface definition, which specifies the return value
and parameters, if any. The procedure-interface definition is optional
if the subprocedure does not return a value and does not have any
parameters that are passed to it. The procedure interface must match
the corresponding prototype, if the prototype is specified.
- Other definition specifications of variables, constants and prototypes
needed by the subprocedure. These definitions are local definitions.
- Any calculation specifications needed to perform the task of the
procedure. Any subroutines included within the subprocedure are local.
They cannot be used outside of the subprocedure. If the subprocedure
returns a value, then a RETURN operation must be coded within the
subprocedure. You should ensure that a RETURN operation is performed
before reaching the end of the procedure.
- An End-Procedure specification (E in position 24 of a procedure
specification)
Except for a procedure-interface definition, which may be placed
anywhere within the definition specifications, a subprocedure must
be coded in the order shown above.
For an example of a subprocedure, see Figure 5.
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