IBM AS/400 manual Coding Considerations, General Considerations

Coding Considerations

A*================================================================*

A* FILE NAME	: CUSTRPT
A* RELATED PGMS	: ARRSRPT
A* DESCRIPTIONS	: THIS IS THE PRINTER FILE CUSTRPT. IT HAS
A*	ONE RECORD FORMAT CALLED ARREARS.

A*================================================================*

AR ARREARS

A				2	6
A					'Customer number:'
A	RPTNUM	5	0	2	23
A					TEXT('CUSTOMER NUMBER')
A	RPTNAME	100A		3	10
A					TEXT('CUSTOMER NAME')
A	RPTADDR	100A		4	10
A					TEXT('CUSTOMER ADDRESS')
A				5	10'Amount outstanding:'
A	AMOUNT	10	2	5	35EDTWRD('	$0. ')
A					TEXT('AMOUNT OUTSTANDING')
A				5	50'Due date:'
A	DUEDATE	10		5	60
A					TEXT('DATE DUE')
Figure	25. DDS for CUSTRPT

Coding Considerations

This section presents some considerations that you should be aware o begin designing applications with multiple-procedure modules. The items grouped into the following categories:

¹General

¹Program Creation

¹Main Procedures

¹Subprocedures

General Considerations

¹

When

coding

a module with multiple procedures,

you

will

want

to

mak

/COPY files, primarily to contain any prototypes that your applicati

require. If you are creating a service

program,

you

will

need

service

program

and

the

prototypes,

if

any.

¹

Maintenance of

the

application means

ensuring

that each

component

is

most

current

level and that any changes do

not

affect

the

diffe

may

want

to

consider

using a tool such as

Application

Development

Ma

to

maintain

your

applications.

For

example,

suppose

that

another

programmer

makes a change to the

file that contains the prototypes.

When

you request

a

rebuild

o

tion, any module or program that

makes use

of the /COPY file will

piled automatically. You will find out quickly if the

changes to t

affect

the

calls

or

procedure

interfaces

in

your

application.

I

tion

errors,

you can then decide whether

to

accept

the

change

avoid

these

errors,

or

whether

to

change

the

call

interface.

Chapter 4. Creating an Application Using Multiple45 Procedures