Example of Module with Multiple Procedures

*=================================================================*

*Source for module CVTPROCS. This module does not have a

*main procedure, as indicated by the keyword NOMAIN. *=================================================================*

H NOMAIN

 

*-----------------------------------------------------------------

*

*The prototype must be available to EACH module containin￿g

*a prototyped procedure. The /COPY pulls in the prototype

*for NumToChar.

*-----------------------------------------------------------------

*

/COPY QRPGLESRC,CVTPROCP

 

*-----------------------------------------------------------------

*

*NumToChar converts a numeric field to a character field

*Parameters: NUMPARM (input)

*Globals: (none)

*Returns: character string

*

*The subprocedure will be called by procedures outside of￿ this

*module, and so the keyword EXPORT is required to indicate￿ this.

 

*-----------------------------------------------------------------

 

 

*

P NumToChar

B

 

 

EXPORT

D NumToChar

PI

31A

 

 

D

NUMPARM

 

30P

0

VALUE

 

* Local declarations

 

 

 

D POS

S

5P 0

 

D SIGN

S

1A

 

INZ(' ')

D ZONEDS

DS

 

 

 

D

NUM

 

30S

0

 

D

CHAR

 

30A

 

OVERLAY(NUM)

 

*

 

 

 

 

*Body of procedure:

*Handle special case of zero

 

C

 

 

 

 

 

IF

 

NUMPARM = 0

 

 

 

C

 

 

 

 

 

RETURN

 

'0'

 

 

 

 

C

 

 

 

 

 

ENDIF

 

 

 

 

 

 

 

* Handle negatives. Set sign to '-' and make positive.

 

C

 

 

 

 

 

IF

 

NUMPARM < 0

 

 

 

C

 

 

 

 

 

EVAL

 

NUMPARM = - NUMPARM

 

C

 

 

 

 

 

EVAL

 

SIGN = '-'

 

 

 

C

 

 

 

 

 

ENDIF

 

 

 

 

 

 

 

* Get the input number in character form using a data struc￿ture

 

C

 

 

 

 

 

EVAL

 

NUM = NUMPARM

 

 

 

 

* Left-justify

 

 

 

 

 

 

 

 

C

 

 

 

 

 

 

 

 

 

 

 

 

C

 

 

'0'

 

 

CHECK

 

CHAR

 

POS

 

C

 

 

 

 

 

EVAL

 

CHAR = %SUBST(CHAR:POS)

 

 

* Return the value

adding the sign

 

 

 

 

C

 

 

 

 

 

RETURN

 

%TRIML(SIGN + CHAR)

 

P NumToChar

E

 

 

 

 

 

 

 

 

 

 

Figure

20.

Source for module CVTPROCS, containing subprocedure NumToChar

CVTPROCS

 

is

a

NOMAIN

module

,

meaning that it consists only of subprocedur

there

is

no

main

procedure. A NOMAIN module compiles faster and require

storage

because

there

is

no

cycle

code that is created for the m

a

NOMAIN

module, by

coding

the

NOMAIN

keyword on the control specificati

For

more

information

on NOMAIN modules,

see “Program Creation” on page 46.

40 ILE RPG for AS/400 Programmer's Guide

Page 63 Page 65
Page 64
Image 64
IBM AS/400 manual Meaning that it consists only of subprocedur, Module, by Coding, Keyword on the control specificati
Page 63 Page 65

AS/400 specifications

The IBM AS/400, now known as the IBM iSeries, is a midrange computer system that has been a cornerstone of enterprise computing since its introduction in 1988. Designed to provide a robust platform for business applications, the AS/400 is celebrated for its reliability, scalability, and integrated database capabilities.

One of the key features of the AS/400 is its Integrated Operating Environment, which blends hardware and software resources seamlessly. This integration allows businesses to execute diverse workloads, ranging from traditional applications to modern web-based services, all on a single platform. The operating system, OS/400 (now IBM i), offers a rich set of APIs and tools for developers, simplifying application development and management.

Another standout characteristic of the AS/400 is its built-in database, DB2 for i. This powerful relational database management system allows for efficient data handling and provides advanced features such as support for SQL, XML, and JSON, making it easier for businesses to manage their data and integrate it with other systems. The database's tight integration with the operating system enables high performance and security.

In terms of scalability, the AS/400 can accommodate small businesses as well as large enterprises, with the ability to support hundreds of users simultaneously. Its architecture allows for easy upgrades in hardware, meaning that organizations can scale their systems without replacing the entire infrastructure.

Security is another critical attribute of the AS/400. With a sophisticated security model, it offers built-in user authentication, access control, encryption, and auditing capabilities to protect data and applications from unauthorized access.

The AS/400 also supports multiple programming languages, including RPG, COBOL, Java, and PHP, giving organizations the flexibility to choose the development tools that best fit their needs. This diversity helps maintain legacy applications while also developing new ones that leverage modern technologies.

Moreover, the platform supports both traditional green-screen interfaces and modern graphical user interfaces, allowing organizations to transition smoothly into contemporary user experience paradigms.

Overall, the IBM AS/400 stands out as a resilient, flexible, and secure computing platform that enables organizations to effectively manage their business operations, streamline processes, and adapt to changing market demands. Its unique combination of integrated features and capabilities ensures that it remains relevant in today's fast-paced technology landscape.
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