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IBMSystem/3
Topics
RPGll Additional
Programmer's
Guide
Program
Numbers:
(Model
5702-RG1 10)
(Model
5704-RG1 15)
(Model
5704-RG2 15)
(Modet
5705-RG1 12l.
P a g eo f G C 1 l 1 7 5 6 7 . 2
,
l s s u e d O J u n e 19 7 8
3
By TNL: cl!21'5616
Third Edition(July1974)
This is a malor revision of , and obsoletes,GC21-7567-1. Inf ormation concerning lBlVl
S y s t e m / 3 l V l r : d e l1 5 h a s b e e n a d d e d a n d n u m e r o u s c o r r e c t i o n s h a r v eb e e n m d i l e . C h a n g e s t o
t o x t a n d i l l u s t r a t i o n s a r e i n d i c a t e d b y a v e r t i c a l l i r r e t o t h e l e i t o f t h e c h a n g e ; n e r , vo r
e x t e n s i v e l y r e v i s e c ii l l u s t r a t i o n s a r e d e n o t e d b V t h e s ' r ' m b o l o a t t h e l e f t o f t h e c a p t i o n .
T h i s e d i t i o r ra p p l i e s o t h e { o l l o w r r r g B M S y s t e r n / 3 P G l l p r o g r a mp r o d u c t s
t I R
Version Mod if icat ion Program Number System/3 Model
'l
15 00 5 7 0 2 - RO 1 I and 0 Disl.
6 00 5 7 0 4 - RG 1 1 5 A ,B , C
zl 00 57C)4 rG2F 15D
4 00 5 7 0 5 - RG 1 12
C h a n g e s r e p e r i o d i c a l l y a d e t o t h e i n f o r m a t i o nh e r e i n : b e l o r eu s i n gt h i s p u b l i c a t i o n
a r m
i n c o n n e c t i r s n i t h t h e o p e r a t i o no f I B M s y s t e m s r e l e r r a t h e l a t e s tI B M S V s t e m / 3
w ,
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coincidental.
L J s e h i s p u b r l i c a t i o n n l y f o r t h e p u r p o s e ss t a t e d i n t h e P r e f a c e .
t o
Publications are not stocked at the address below. Reqr,lestsor copies of IBM publications
f
and for technical inforrnation about the system shoulcl he made to your IBM representative
c,rto the lEi\4 branch office serving your locaiity.
1 ' h i sp u b l i c a t i o nc o u l d c o n t a i n t e c h n i c a li n a c c u r a c i eo r t y p o g r a p h i c ae r r o r s . U s e t h e
s l
F l e a d e r ' C o r n m e n tF o r m a t t h e b a c k o f t h i s p u b l i c a t r o n o m a k e c o m m e n t sa b o u t t h i s
s t
p ' u b l i c a t i o n .l f t h e f o r m h a s b e e n r e m o v e d , d d r e s s o u r c o m m e n t st o I B M C o r p o r a t i o n ,
a y
F u b l i c a t i o n sD e p a r t m e n t2 4 5 . R o c h e s t e r M i n n e s o t a 5 9 0 1 . C o m m e n t sb e c o m et h e
, . 5
p r o p e r t yo l l B M .
( ) l n t e r n a t i c , n a l u s i n e s M a c h i n e s o r p o r a t i o n1 9 - 1 1 1 9 7 4
B s C .
P a g eo f G C 2 1 ' 1 5 6 1 - 2
lssued 4 May 1976
2
B v T N L : G N 2 1- 5 3 8 9
Preface
p s
T h i sr r r a n u a lr e s e n ta d v a n c e R P Gl l p r o g r a m m i ntg p i c s
d o ORGANIZATTON F THE MANUAL
O
f o r a p r p l i c a t i o n o g r a m m e r s d s t u d e n t s , h o m u s tc o d e
pr an w
p r o g r a mfs r I B M S y s t e m / 3 :
o T h i s p u b l i c a t i o n h a s e l e v e nc h a p t e r s . C h a p t e r s1 - 6 c o v e r
i n f o r m a t i o n t h a t i s b a s i ct o m o s t d a t a p r o c e s s i n go b s :
j
o M l o d e l6 R P G l l p r o g r a ml o g i c ,c l e t a i l e dn f o r m a t i o na b c u t w r i t i n g
i
i n p u t , o u t p u t , a n d c a l c u l a t i o ns p e c i f i c a t i o n s n d t h e c o n -
a
o l V o d e l8 c e p t sa n d s p e c i f i c a t i o ni s v o l v e d n m u l t i f i l e p r o c e s s i n g .
n i
A d d i t i o n a l p r o g r a m m i n gt o p i c s t h a t y o u m a y r e q u i r ef o r
o M l o d e l1 0 ( C a r d S y s t e m ) y o u r j o b a r e p r e s e n t e di n C h a p t e r s7 - 11 : c o n t r o l l i n g i n p u t
a n d o u t p u t d u r i n g c a l c u i a t i o ni m e , t a b l e s a r r a y s , a t a
t , d
o Mlodel 0
1 s t r u c t u r ea n d t h e D E B U G o p e r a t i o n .
,
o lVlode12
l
RELATED PUBLICATIONS
o lVlodel 5
1
T h e r ea r e n u m e r o u sI B M S y s t e m / 3p u b l i c a t i o n s o n t a i n i n g
c
T h e S i y s t e m / 3 o d e l 8 i s s u p p o r t e db y S y s t e m / 3 M o d e l 1 0
M further information on RPG ll. The following are the re-
c o n t r o l p r o g r a m m i n ga n d p r o g r a m p r o d u c t s . T h e f a c i l i t i e s latedreference anuals:m
d e s c r i b e di n t h i s p u b l i c a t i o nf o r t h e M o d e l 1 0 a r e a l s o a p p li -
cable to the Model 8, although the Model 8 is not referred . IBM System/3 Card System RPG ll Reference Manual,
t o . l \ o t e t h a t n o t a l l d e v i c e s n d f e a t u r e st h a t a r e a v a i l a b l e
a S C 21 - 7 5 0 0
on tlre Model 10, areavailable n the Model 8. Therefore,
o
Model 8 usersshould be familiar with the contents of the . IBM System/3 RPG ll ReferenceManual,SC2l 7504
IBM liystem/3 Modet 8lntroduction,cc2l-5144 | (Model 10, Model 12 and Model 15)
o IBM System/3 Model 6 RPG ll Reference Manual,
PREFIEQUISITES sc21 7511
T h i s r n a n u a la s s u m e sh a t y o u h a v ec o d e d a n d t e s t e d s o m e
t l f y o u a r e p r o g r a m m i n go n a d i s k s y s t e m ,i t w o u l d b e h e l p -
b a s i c R P G l l p r o g r a m st h a t i n c l u d e l i s t i n g r e c o r d so n a f u l i f y o u w o u l d u n d e r s t a n d h e d i s k c o n c e p t sa n d d i s k f i i e
t
p r i n t e r , s i m p l ec a l c r - r l a t i o ng r o u p t o t a l s , a n d t h e u s e o f
s, p r o c e s s i n gn f o r m a t i o n i r r t h e f o l l o w i n g b o o k s b e f o r e r e a d -
i
m o r e t h a n o n e r e c o r d t y p e . Y o u m a y h a v e g a i n e dt h i s ing this book:
e x p e r i e n c e h r o u g h I B M e d u c a t i o nc o u r s e s , r o g r a m m e d
t p
instruction courses,or previous data processing experience. o IBM System/3 Disk ConceptsanclPlanning Guide,
l n t r o < T u c t i o no R P G l l , G C 2 1 . 7 5 1 4 ,c o n t a i n ss o m e o f
t G C Z | - 7 5 71
t h i s b a s i ci n f o r m a t i o n .
. IBM System/3 RPG ll Disk File Processing Programmer's
Guide. GC217566
How To UseThe Manual
This publication is a programmer's guide; it is not intended For ease illustration.
of many of the examples this book
in
to servethe same purpose as a referencemanual of language usecard-like figures represent
to records.This doesnot
specificationsand does not replacea referencemanual. imply that a carddevicemust be usedfor input or output
R P C il l p r o g r a m m i n gt o p i c s a r e a p p r o a c h e d n d o r g a n i z e d
a in thesesituations.Any of severalinput/outputdevices
t j
a c c c , r d i n go t h e i r n o r m a l u s e i n a d a t a p r o c e s s i n go b , u s i n g might be used, depending which System/3
on modeland
e x a r n p l e s h e n e v e rp o s s i b l e . U n l i k e a r e f e r e n c e a n u a l ,
w m configuration you are using.
i n d i ' r i d u a l h a p t e r sa r e s e l f - c o n t a i n e d n i t s o f i n f o r m a t i o n ,
c u
interrdedto be read from beginning to end. However, if you
d e s i n e n f o r m a t i o n a b o u t a s p e c i f i ct o p i c , y o u m a y g o
i ReYiewOuestions
direrctlyto that topic by using the index or the table of
c o n t e n t s . l t a n i n d i v i d u a lc h a p t e r h a s a s p e c i a lp r e r e q u i s i t e Review questions and answers provided the end of
are at
t o p i c , t h a t t o p i c i s c l e a r l y i d e n t i f i e do n t h e t i t l e p a g eo f eachchapter.Wherechapters containseveral relatedtopics.
the r:hapter. thesequestions grouped subtopic. lf you wish,you
are by
may turn to the end of the chapterafter you complete each
Altfrough the chapters are complete units, there is a logical subtopic. answer reviewquestions
to the and reinforce what
progressionof topics through chapters 1-6. Therefore, you you havelearned, beforecontinuing chapter.
the
may wish to read them consecutively. lf you have read the
RPC;ll Programming Fundamentals Programmed Instruc
tion course, Vou do not need to read chapters 1-6 consecu-
tivelly.
P a q ec t G C 2 1 - 7 5 6 7 - 2
l s s u e d 1 D e c e m b e r1 9 7 9
2
By TNL: cN21-5709
Contents
HOW TO USE THE MANUAL iii CI-IAPTER3. CONTROLI-ING PRII\ITEROUTPUT 3-1
Inlroduction 3 2
CH]APTER . RPG II LOGIC
1 1-1 Using Overflow and Fetch Over-flow To Control Page
Introducti
on 1-2 Formatlrng 32.
Basic Data Processing Logic 1-2 Overtlow Indicators ?,)
B a r ; i cR P G l l L o g i c 1-4 Specificarions for Usrng Overflow Indicators 3 4
Specific Steps in Easic RPG tl Logic t-r) P r e v e n t i n g R e c o r d s F r o m P r - i n t i n gO v e r l - h e
First Program Cycle . 1-1 P e r fo r a t i o n . 3-6
Sumrnary of Basic RPG ll Logic 1-7 Fetch Overflow 3 8
R P t Gl l L o g i c R e l a t e d T o I n d i c a r o r s 1-7 Aligning Forms J - l l
1P (F rst Page) Indicators 1-13 Editrng 3 -1 2
Last []ecord Indicator (LR) . t - t o Methods ot Fditinil 312
Record ldentifying Indicators (0,|-99) 1-'19 Editing and End Posrtron 3 19
Field Indicators(01-99) Using *PLACE To Print Duplicate Information
1-25 3- 1 9
R e s u l t i n g I n d i c a r o r s( 0 i - 9 9 ) 1-31 Specifrcatrons For Llsing *PLACE ? 11
H a l t I n d i c a t o r s ( H 1- H 9 ) I -JJ FormationOf Print Lrrres 3-22
Overf ow Indicator (OA-OG. OV) 1-41 Printrng A FielcJ everal Times On The Same Line
S 3-26
Matching Records Indicator (MR) 1-42 Using Two Pnnter Uutput Filesin One Program ) a a
Setting Indicators | -z+J Model 10 Card and Disk Systems 328
Model 6 . 328
IRE'VIEW1 145 F i i e D e s c r r p t r o nS n e c i l r c a l r o n s 328
Output Format Specifications 3-29
T A N S W E R S O R E V I E W1
T 146 Example: Enij of the-Monrh Billing 3 -3 1
I 3 H A P T E I R, D E S C R I B I N G N D U S I N G I N P U T
2 A 2-1 REVIEW 3 . 3-33
Introduction Overflow and Fetch Over{low 2?
"
llontroi F:ir3ldg F o r r n sA l i g n m e n l 334
Split Control Fields 2-5 Editing 334
Checkingthe Sequence Flecord
of Types 2-6 *PLACF
3-35
Orderof RecordTypes Within a Group 2-6 Dual PrinterOulpul t ites 3-35
Check.ing Order of RecordTypes in a Group
the 2-12
Incorrect Records Withrn a Group 2-12 ANSWERS TO REVIEW 3 , . 3-36
Sequenced and Unsequenced Record Types in
a Group 2-14 CHAPTER 4. CARD OUTPUT.OPERATIONS . 4-1
Unexpected or Unused Records Within a Group z- tq Introductron . 4-2
Field Record Relation lndicators 2 - 15 P u n c h i n g A n d P r i n t r n gO n C a r d s . 4 2
r O RR e l a t i o n s h i p 2-15 Punched Output . 4-2
t0R Relationship With Field Record Relation P r i n t r n gO n C a r d s . 4 2
En t r i e s 2-16 Using One File For tsoth lrrput And Output 4 8
Field llecord Relation with Control Fields 2-18 Punching into The Sanre Card That ls Read 4-8
Field Record Relation with Split Control Fields 2-18 Punching Into A Blank Card In The File 4-11
CorrditiorringUse of lnput Files (External Indicators) 2-'t9 When To Specify A Combinecl File 4 14
Using t)ne Prograrn to do More Than One Job 2-'t9 Stacker Selection 414
lEndingThe Program Before Processing All Files Input Arrd Cornbined FileCards 415
Completely 2-22 Stacker Selectirig Output File Cards 4 1 1
Merging Input And Output FileCards 415
RE\/f EW i2 2-25
REVIEW 4 4-21
I\NSWERS TO REVIEW 2 . 2-28 P u n c h i n g a n c JP r i i ' r t i n g n C a r d s
O 4-21
Using Orre FrleFor Both Input And Or.rtprut 421
Stacker Selcction 423
ANSWERS TO REVIEW 4 . 4-25
CHAPTER 5. CONTROLLING OPERATIONS IN AN R E V I E W5 5-73
RPG II PI1OGRAM . 5-1 Additional Uses Of Indicators 5-73
lrrtroductiorr 3 1 Controlling Operations On The Basis of the Next
Additional Llses of Indicators To Control Calculations Record In A File 5-14
;:nd Output 5-2 Moving Data 5-74
Preventing Operations From Being Done When B r a n c h r n gI n C a l c u l a t i o n s 5-75
An Errrlr Occurs . 5-2 Using SubroutrnesIn Calculatiorrs 5-75
Controll ng Which Operations Are Done for a Special Uses Of Control Level Indicators 5-76
Specific Program Run 5-7 Binary Field Operatrons 5-76
Controllrng Calculations When Overflow Occurs 5 - 11 Dual Input/Output Areas 5-76
Performing Calculations On The Basis of the
Resultr;Of Other Calculations 5-12 A N S W E R S T O R E V I E W5 . . . 5-77
Conlrolling t]perations on the Basis of the Next
llecord In A File 5 - 17 C H A P T E R6 . M A T C H F I E L D SA N D M U L T I F I L E
Process ng Card or Disk Files 5 - 17 PROCESSING 6-1
CheckinE For Duplicates 5-20 Introduction b-l
Doing Special Operations When There ls Onlv Checking Sequence Of Records Within A File . 6-2
One Record In A Group 5-26 File Containing Only One Record Type 6,2
Doing Special Operations For The Last Record File Containing More Than One Record Type Cr-b
In A Group 5-28 Using Match Fields With Field-Record Relation for
Additiorral Points To Consider About Look Aheao s-28 More Than Orre Record Type in a File 6-8
Moving Data 5-28 Match Fields The Same For All Record Tvpes 6,8
Specifications For Moving Data 5-29 Match Fields Differ Between Record Types 6-9
Saving Information From A Field Bv Move Matching Records: One Record Type in Each File 6-12
Operatrr:ns q_e 1
Processing Order: More Than One Matching Record
Separating One Field Into Two Parts E_?? In A Secondary File 6-12
C h a n g i n g F i e l d T y p e ( A l p h a m e r i co r N u m e r i c ) 5-34 Processing Order: More Than One Matching Record
Branching In Calculations In The Primary File 6-20
Bypassirrg Calculations 5-36 M a t c h i n g R e c o r d s : nr"ora" Which Have No Match
Branching Backward 5-42 In The Other Fiie 6-20
Using Subroutinesin Calculations 5-44 Matching Records: More Than One Record Type In
Using Subroutines To Do The Same Calculations A File . 6-26
Several Times In One Cycle 5-45 Match Fields In Different Locations In The
Controlling Overlay by Using Subroutines 5-54 Same Frle 6-26
RPG ll LinkageEditor 5-54 Processrng Records Which Do Not Have Match
LinkageEditor Map 5-55 Frelds 6-29
Simple Ctverlays 5-56 Matching Records: When All Records In One File
Speciai Open 5-56.1 Have Been Processed 6-30
Overlay litarting Addresses 5-56.1 Use of Match Fields and Control Fields In the Same
Fitting Available Storage 5-56.3 File 6-34
R P G l l l . - o g i ca n d F u n c t i o n S h i f t i n g 5-56.3 Determining Whether Files Should Be Primary or
S p e c i a l U s e r so f C o n t r o l L e v e l I n d i c a t o r s 5-56.4 Secondary 6-38
Internal Control Level Indicator L0 5-56.4
Using Control Level Indicators As Calculation R E V I E W6 6-41
ConditioningIndicators 5-59 ReviewProblern 6-44
Group Printing 5-59
B i n a r y F i e l c lO p e r a t i o n s ( C o n t r o l l i n g S w i t c h e s ) 5-67 ANSWERSTOREVIEW6. .6-46
BITON OperationCode 5-67 Solutron l-o The Review Problem 6-49
BITOFOperationCode 5-67
TESTB0peration Code 5-68
Example 5-69
'Ihe
Increasing Speed of Operations (Dual l/O Areas) 5-69
D u a l I n p r uA r e a s
t 5-69
D u a l O u t p u tA r e a s 5-tl
P a g eo f G C 2 1 - 7 5 6 7 - 2
lssued21 December 1979
By TNL: GN21-5709
C H A P T E R7 . P R O G R A M M E DC O N T R O LO F I N P U T CHAPTER 9" ARRAYS 9-1
AI{D OUTPUT 7-1 Introduction 9-2
Introduction l-2 When To Use an ,ArravInsteadof a Table 9-2
l\lterringThe Order of Processing Files (Force DefiningAn Array 9-2
0peration) . 7-2 Referencing ElementsIn An Array
All 9-4
i3peofy'ing The Next File To Process Array to Array Calculations 9-4
Alternating Processing Between Two Files . 7-4 Calculations Using Arrays and Single Fields(Or
Forcing A Number of Records From a File 1 1
Constantsi 9-7
l-ook-Ahead To Determine Whether A File ls To Adding All Elements Within An Array 9-8
Be Forced /- tc Output of an Entire Array 9-g
Pro,ressingDemand Files (Read Operation) 7-22 Accumulating Groups Of Totals 9-14
llonsirjerations For Using READ and Demand Referencing IndividualElements an Array
of 9-19
Files 7-26 IndexingAn Array 9-20
f ] e p r e t i t i v eO u t p u t ( E x c e p t O p e r a t i o n ) 7-26 Output of IndividualElements An Array
of 9-22
lJsing EXCPT and *PLACE 7-26 ReferencingOnly Part of a Field 9-23
llonditioning The Use of EXCPT Operation 7-29 LOKUPOf An Array 9-27
Searching Array For A Particular
An Element 9-27
]lE\/tEW 7 . .7-31 Searching Array For More Than One Element
An 9-32
FC)RCE 7-31 Output During An Array Search 9-34
I 1 E A D. 7-32 LoadingArrays 9-35
EXCP'T 7_33 CompileTime Arrays 9-35
Pre-execution Time Arravs 9-36
l\NrSU,/EtlS REVIEW 7
TO .7-34 Storing Input Data Into ExecutionTime Arrays 9-38
Arrav Data Consecutive More Than One Record
On
(Model 6, Model 10 Disk System,and Model 15) 9-44
CH,APTER 8. TABLES 8-1
lntr,cductron 8-2 REVTEWI . 9-53
l S e a r c h i n ga S i n g l e T a b r e B-4
Desigrring Table Input Records g-4
A N S W E R S T OR E V I E W g . .9-55
D e s c r i b r i n gT a b l e I n p u t R e c o r d s W i t h E x t e n s i o n
S p e c i fi c a t i o n s B-5 C H A P T E R1 0 . W O R K I N G W I T H D A T A
{loding The Table Lookup Operation (LOKUP) B-7 STRUCTI.JRE . 1O-1
l-wo Table Search 8-8 Character Structure 1O-2
Designing Table Input Flecords For Two Tables 8 - 11 Representation Characters 96-ColumnCards
Of On 10-2
D e s c r i L r i n gT w o T a b l e s W i t h E x t e n s i o n
Representation Of Negative Numbers . 10-3
S p e c i fi c a t i o n s 8 - 13 Representation of Characters In Storage . 10-4
Codinq The Table Lookup Operation (LOKUP) B-1 4 Difference Between Character Representation on
L J s i u g I a b l e D a t a I n C a l c u l a t i o n sa n d O u t p u t 8 - 14 Cards and In Storage 10-4
Conditiioning Operations On The Basis of a Table
ldentifying Bit Combinations With Numerical
Lookup 8-1 4 Values 10-13
l?efererrrcing ata Following A Successful Search
D 8 - 16 Assigning Numerical Values to Zone ancl Digit
llearching For Low, High, or Equal Conditions 8 - 19 Portions 10-16
lVoving Data In A Table Entry 8-21 Saving Disk Storage Space 10- 9
1
l V l o d i fy i n g T h e C o n t e n t s O f A T a b l e 8-22 Collating Sequence of Characters 10-21
t.oading liables 8-25 Collating By Zone or Digit 10-25
llomp le Time Tables B-25 Altering the Collating Sequence 10-2_8
P r e - e x ' c u t i o nl - i m e T a b l e s B-25 Specifying Changes In Collating Sequence . 10-28
l*oading Pre-execution Time Tables B-26 Coding Characters To Be Equal 10-33
Oulput or an EntireTable 8-28 Recording Specifrcations For The Altered
Seouence 10-38
flE\/lEW I . 8-29
lleview Problem 8-30
vll
Alterrng The Structure of Characters 10-39 C H A P T E R1 1 . D E B U G 't
1"1
How Move Zone Operations Work 10-39 lntroduction 11-2
Coding a Move Zone Operation 10-39 Using The DEBUG Function I t-l
D i f f e r e n c , e sI n T h e M o v e Z o n e O p e r a t i o n s 10-40 Specifications For DEBUG 11,-2
Field Forrnat and Move Zone Operations 10-41 Formatof RecordsCreatedBv DEBUG
Example of a Move Zone Operation 10-41 Getting ResultsFrom DEBUG
C l ' r o o s r n gt h e M o d e l C h a r a c t e r F o r F a c t o r 2 't0-42 .r
Placement DEBUG
of 1-5
T r an s l a t i n g C h a r a c t e r s 10-44 Making Your ProgramWork For All Cases 11 , 5
Need For FileTranslation 10-44
Specifyrn'gFile Translation 10-44 R E V I E W1 1 11-7
Recording Specifrcations For The Translation
Table 10-48 A N S W E R S T O R E V I E W1 1 11-8
REVIEW 1O 1049 INDEX x"1
Character Structure 10-49
Collating liequence of Characters . . 10_49
'l-he
Altering Collating Sequence . 10_50
Alrering l-he Structure of Characters . 10-50
T r a n s l a t i r r r ;C h a r a c t e r s . 10_50
ANiSYYgPgTO REVTEW10 1O_S1
Chapter1. RPG ll Logic
CHAPTER 1 DESCRIBES:
B a s i cR P G l l l o g i c .
R P G l l l o g i c r e l a t e dt o i n d i c a t o r s .
A F T E R R E A D I N G T H I S C H A P T E RY O U S H O U L D B E A B L E T O D E S C R I B E :
B a s i ct h r e e - s t e p o g i c o f a d a t a p r o c e s s i n go b .
l j
D e t a i lt i m e a n d t o t a l t i m e .
S p e c i f i cs t e p si n a b a s i c R P G I I j o b t h a t i n c l u d e s e t a i l a n d t o t a l o p e r a t i o n s .
d
R P G l l l o g i c r e l a t e dt o t h e f o l l o w i n g i n d i c a t o r s : 1 P , L R , r e c o r d i d e n t i f y i n g
i n d i c a t o r s , i e l d i n d i c a t o r s , e s u l t i n gi n d i c a t o r s , a l t i n d i c a t o r s( H 1 - H 9 ) , o v e r f l o w
f r h
i n d i c a t o r s( O A - O G , O V ) , m a t c h i n gr e c o r d si n d i c a t o r ( M R ) .
fuofe.' You can use the review questions contained in Review / at the end of this
chapter to test your comprehension of the chapter. Answers follow the review
o u e s to n s .
t
RPGll Logic 1-1
INTRODUCTION R P G l l l o g i c i s b u i l t a r o u n d t h e s ei n d i c a t o r s . T h e i r s t a t u s
( o n o r o f f i a f f e c t st h e s e q u e n c e f t h e p r o g r a m ' so p e r a t i o n s .
o
W h a t p r o c e d u r e s o y o u f o l l o w i f y o u a r e p r e p a r i n gb i l l s t o
d T h e l o g i c i s s e t u p t o t e s t t h e s t a t u so f v a r i o u si n c l i c a t o r s t
a
s e n dt o c u s t o m e r s ?B e f o r e y c u c a n d o a n y t h i n g y o u n e e o s p e c i f i ct i m e s . B y t e s t i n g i n d i c a t o r s , h e p r o g r a m k n o w s
t
s o m e i n l o r m a t i o n . Y o u h a v et o k n o w t h r e et h i n g s : ( 1 ) what to do next.
t h e c u s t o m e r ' sb a l a n c ea t t h e b e g i n n i n go f t h e m o n t h ; ( 2 )
h i s p u r c h a s e sa n d ( 3 ) h i s p a y m e n t s . O n c e y o u h a v e
; R P G | | p r o g r a m l o g i c i s d e s i g n e d o t a k e c a r eo f a l l t y p e s o f
t
g a t h e r e dt h i s i n f o r m a t i o n , y o u c a n p e r f o r m t h e n e c e s s a r y jobs. You must understand his logicto write specifcations
t i
calculationso find the amount due. Finally you record
t w h i c h m a k e c o r r e c t u s eo f i t .
t h i s a m o u n t o n t h e b i l l . Y o u g o t h r o u g h t h e s es a m ep r o -
c e d u r e sf o r e a c h c u s t o m e r . B e c a u s eh e l o g i c i s a r a t h e r c o m p l e x t o p i c , i t i s d e s c r i b e d
t
s e g m e n tb y s e g m e n t . H o w e v e r ,w h e n y o u h a v e f i n i s h e d
T h i s i s a t y p e o f j o b y o u c a n e a s i l yh a v ey o u r c o m f l u r e r o o r e a d i n gt h i s s e c t i o n .y o u w i l l h a v ea p i c t u r e o f h o w t h e
f o r y o u , T o d o t h e j o b , h o w e v e r ,t h e c o m p u t e r m u s t k n o w c o m p l e t e R P G l l p r o g r a m l o g i cw o r k s .
t h e s a m et h i n g s y o u k n o w . Y o u m u s t , t h e r e f o r e ,t e l l i t
e x a c t l y w h a t i n f o r m a t i o n t o e x p e c t ,w h a t t o d o w i t h t h e
i n f o r m a t i o n ,a n d w h a t t o g i v ey o u a s a r e s u l t . T h i s y o u d o B A S I C D A T A P R O C E S S I N GL O G I C
t h r o u g h s p e c i f i c a t i o n s o u w r i t e : F i l e D e s c r i p t i o n ;E x t e n .
y
s i o n ; L i r r eC o u n t e r ; I n p u t ; C a l c u l a t i o n ; n d O u t p u t - F o r m a t .
a U s u a l l y ,a l l r e c o r d si n a f i l e o f i n p u t r e c o r d sa r e n o t r e a d a t
o n c e . Y o u r c o m p u t e r p r o b a b l y i s n o t l a r g ee n o u g ht o s t o r e
T o d o t h i s b i l l i n g j o b , y o u d o t h i n g s i n a l o g i c a lo r c j e r . y o u a n d w o r k w i t h i n f o r m a t i o n f r o m a l l r e c o r d sa t t h e s a m e
readinformation first. You do calculations econd. Finally, s t i m e . T h e r e f o r e ,r e c o r d sa r e r e a d o n e a t a t i m e . T h r e e
a s a r e s u l t o f t h e c a l c u l a t i o n sy o u r e c o r d t h e a m o u n t o w e d .
, s t e p s ,a s s h o w n i n F i g u r e 1 - 1 , a r e d o n e f o r e a c h r e c o r d r e a d .
T h e n y o u b e g i n t o d o t h e s a m et h i n g s r n t h e s a m eo r d e r f o r
tne next customer. The phrasepragram cycle refersto all the operations per-
formed from the time one recordis readuntil the next rec-
T h e c o n r p u t e rm u s t a l s o d o t h i n g s i n a l o g i c a lo r d e r . T h e o r d i s r e a d . O n e p r o g r a m c y c l e i s t h e r e f o r eo n e r e v o l u t i o n
i n f o r m a t i o n y o u s u p p l y t h r o u g h s p e c i f i c a t i o n s o e s n ' tg i v e
d a r o u n d t h e c i r c l e u s e dt o i l l u s t r a t et h e p r o g r a m l o g i c . S i n c e
t h e c o m p u t e r t h e l o g i c i t n e e d st o d o y o u r j o b ; t h e R p G l l o n e p r o g r a mc y c l e ( o n e r e v o l u t i o n ) i s n e e d e df o r e a c n r e c -
C o m p i l e r s u p p l i e s h i s . R P G l l l o g i c s u p p l i e db y t h e c o m -
t o r d r e a d , m a n y p r o g r a m c y c l e sa r e r e q u i r e df o r e v e r y j o b .
p i l e r i s t h e f r a m e w o r k f o r y o u r j o b . W h e n y o u r s o u r c ep r o -
g r a m i s r : o m p i l e d ,y o u r s o u r c es t a t e m e n t s r e f i t t e d i n t o t h e
a C o n s i d e rh o w t h e t h r e e s t e p l o g i c s h o w n i n F i g u r e 1 - l w o r k s
f r a m e w o r k o f R P G l l p r o g r a ml o g i ct o m a k e a c o m p t e t e f o r a j o b w h i c h r e q u i r e sa d e t a i l e dl i s t i n go f p u r c h a s e s a d e
m
p r o g r a m . T h e g e n e r a t e d r o g r a mt h e n h a s a l l t h e i n f o r m a -
p b y e a c hc u s t o m e r . T h e i n p u t f i l e i s i n a s c e n d i n g r d e r b y
o
t i o n i t n e e d st o d o y o u r j o b i n a l o g i c a lm a n n e r . c u s t o m e rn u m b e r . E a c h r e c o r d c o n t a i n sc u s t o m e rn a m e
( N A M E ) , n u m b e r ( N U M ) , a n d c h a r g e( C H R G ) . I n f o r m a t i o n
W h a t h a p p e n si f , i n d o i n g y o u r b i l l i n g j o b , y o u f i n d t h a t a from the record is merely transferred to the printed page.
c u s t o m e rp a i d m o r e t h a n h e o w e d ? Y o u k n o w i m m e d i a t e l y O n e l i n e i s p r i n t e d f o r e a c hr e c o r dr e a d . E a c h r e c o r d r e a d
t h a t h e h a s a c r e d i t b a l a n c ea n d i n d i c a t es o o n t h e i n v o i c e . is known asa detail recordand each line printed is a detail
H o w d o e st h e B P G | | p r o g r a mr e c o g n i z e h i s s i t u a t i o n ?
t line.
And how doesit know what to do when sucha situation
occurs? The job begins: the f irst recordis read. No calculations re a
p e r f o r m e d . A r e c o r d i s t h e r r p r i n t e d . T h i s e n d st h e f i r s t p r o -
T h e R P G l l p r o g r a m u s e ss i g n a l s h i c h t e l l i t w h e n a p a r t i c -
w g r a m c y c l e . T h e s e c o n db e g i n sw i t h t h e r e a d i n go f a n o t h e r
u l a r s i t u a t i o no c c u r sa n d w h a t t o d o w h e n t h a t s i t u a t i o n r e c o r d . F i g u r e 1 - 2 s h o w st h e i n p u t a n d o u t p u t o f t h e d e t a i l
d o e s o c c u r . T h e s es i g n a l s r e k n o w n a s i n d i c a t o r s . T h e r e
a p r i n t i n gj o b .
a r e m a n y d i f f e r e n t k i n d s o f i n d i c a t o r sw h i c h s i g n a rm a n y
d i f f e r e n t s i t u a t i o n s . Y o u , a s a p r o g r a m m e r ,m u s t k n o w h o w S u p p o s e , o w e v e r ,i n s t e a do f m e r e l y l i s t i n gt h e c h a r g e s
h
t o s p e c i f y t h e i n d i c a t o r ss o t h a t t h e y s i g n a lt o t h e c o m p u r e r m a d e b y e a c h c u s t o m e ry o u a l s ow i s h t o f i n d t h e t o t a l
what you want them to. c h a r g e s o r e a c h c u s t o m e r ,a s s h o w n i n F i g u r e 1 - 3 .
f
t-z
a
\
Writeor punch
a record
resu
lts
Perform calculations
.@
Figure 1-1. BasicLogic of a Data Processing ob
J
1796 JOHN BART 2493
I762 BILLBELL 13142
1645 JOE AARON
,I&5 JOE AARON 742
1645 J O EA A R O N 7.42
1645 J O EA A R O N 6.43
13.85*
'13'1
.42
1762 BILL BELL
131.42*
1796 J O H NB A R T 24.93
1796 J O H NB A R T 2.98
Printed reoort
Figure 1-2. Detail Printing Job F i g u r e 1 - 3 . C a l c u t a t i n ga n d P r i n t i n g T o t a l s
RPGll Logic
T o d o t h i s , y o u m u s t d o c a l c u l a t i o n so a c c u m u l a t e
t a total BASIC RPG II LOGIC
i n a d d i t i o n t o p r i n t i n g o u t i n d i v i d u a l ( d e t a i l )r e c o r d s .
But
w h e n d o y o u p r i n t o u t t h e t o t a l y o u h a v ec a l c u l a t e d ?
The R P G l l l o g i c ,t h e r e i o r e , i s a n e x t e n d e dv e r s i o no f t h i s 3 - s t e o
t o t a l f o r a c u s t o m e r ,o f c o u r s e ,s h o u l d b e p r i n t e d a f t e r
all l o g i c . l t c a l l sf o r c a l c u l a t i o n s n d o u t p u t o p e ◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo