Session 9 Tables and Arrays

7/23/2019 Session 9 Tables and Arrays

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RPG/400

Session 9


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INTRODUCTION

Arrays and tables allow ro!ra" to

or!ani#e !ro$s o% related data ele"ents

%or easy retrie&al'

Data str$(t$res allow to de%ine an area o%

sa(e wit)in "e"ory to store indi&id$al

ele"ents o% data'

*le"ents are s$b%ields wit)in a lar!er

str$(t$re'


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TA+,*S

Store fixed set of data elements for lookup

Generally used when fixed number of possible elementsare in the list.

Used for validation

To extend usefulness of tables RPG allows to define

second table related to the first. A related table is a list of elements associated with

correspondin element with the primary table.

Tables cab be loaded at !ompile time or at pre"runtime.

!ompile time tables are loaded with data included in thesource code.

Pre runtime tables load from the #atabase file durininitili$ation phase of the proram execution.

Table names bein with TA%.


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Arrays

O%%ers "ore %le-ibility in%$n(tion t)an table

Pro!ra" (an dyna"i(allyre%eren(e and "ani$lateindi&id$al ele"ents d$rin!

e-e($tion One (o""on $se is to )old

s$""ary totals d$rin!e-e($tion

Arrays (an be sorted and

n$"eri( &al$es (an be totaled$sin! sin!le o.(ode'

Arrays are loaded at (o"ileti"ere.r$nti"e and r$nti"e'


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Co"ile ti"e arrays are loaded wit) data

in(l$ded in t)e so$r(e (ode'

Pre r$n ti"e arrays load %ro" t)edatabase %ile d$rin! initiali#ation )ase o%

ro!ra" e-e($tion'

R$nti"e arrays are loaded wit)in t)ero!ra" lo!i( d$rin! e-e($tion'

Array ele"ents (an be a((essed $sin! an

inde-'


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Co"ile Ti"e table

De%inition

D TA+NA*S S 10 DI23

CTDATA

P*RRCD25 *a() ele"ent de(lared as 10 ()ara(ter len!t) DI 6eyword se(i%ies "a-i"$" n$"ber ele"ents

in table as 3

CTDATA 6eyword indi(ates table is loaded $sin!(o"ile ti"e data e"bedded in t)e so$r(e' P*RRCD indi(ates )ow "any ele"ents in table are

loaded %ro" ea() line o% so$r(e


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#TA%S!&R' S ( ) #*+,-

A/T,TA%0ames

This #efines related table to store test scores.

#eclares each element as ( diit numeric values with $erodecimals.

The A/T keyword declares table as related or alternate tableof TA%0ames.

1ou cannot specify P'RR!# of !T#ATA when A/T keywordis used.

#ata used to load alternate table is loaded from the samesource record as the main table.

The bottom of the source member contain the data used toload the table


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77CTDATA TA+Na"esRA8 090

IRAN 0:0

8O* 0;3

SIT< 0=9

ANI, 0>3

API, 0:1

NI


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C yNa"e ,OOUP TA+Na"es TA+S(ores

C I? 7IN90 @ 7ON 90

C *C*PT PrintItC *NDI?

T)e St$dent na"e to be lo(ated is in ?a(tor 5 %or

loo6$ oeration T)e loo6$ is er%or"ed on table TabNa"es

I% ,oo6$ s$((eeds indi(ator 90 is seton and(orresondin! ele"ent TA+s(ore is ret$rned'

T)e related table TA+SCOR* (ontains t)e(orresondin! t)ree di!it T*STSCOR* &al$e'


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PR*RUNTI* TA+,*

?T*ST?I,* IT ? 11 DIS

Table %ile is identi%ied by entry T in t)e Col osition 5: ?ile is oened %or in$t only'

DTA+Na"es S 10 DI230

P*RRCD25

?RO?I,*2Test?ile

T)e na"e o% t)e tablesi#e and attrib$te o% ea()ele"ent "a-i"$" n$"ber o% ele"ents are de%ined in

t)e D.Se( P*RRCD 6eyword de%ines )ow "any ele"ents o%table to load %ro" ea() line o% %ile re(ords' De%a$lt is 5'

?RO?I,* 6eyword indi(ates t)at t)e table is to be

loaded $sin! re(ords in t)e %ile T*ST?I,*


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D TA+SCOR* S = 0 DI230

A,T2TA+Na"es

*T?T2P

Alternate table is de(lared

+e(a$se test s(ore in t)e %ile is de%ine as

a(6ed n$"eri( t)e e-ternal %or"at

6eyword is $sed to "a t)e ne(essary

translation

P*RRCD and ?RO?I,* (annot bese(i%ied wit) t)e de%inition o% t)e A,T

table'


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Co"ile Ti"e Array

D NA*S S 10 DI23

CTDATA

P*RRCD25

DI indi(ates (aa(ity o% t)e array

CTDATA indi(ates it is a (o"ile ti"e array and

re(ords are loaded %ro" botto" o% t)e %ile' P*RRCD de%ines )ow "any re(ords to be

loaded %ro" ea() line o% so$r(e'


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77CTDATA Na"e

8o)n

S"it)

ABay8oe

77CTDATA TestS(ore

0:30=3

030

095

*a() CTDATA be!ins in (ol$"n 0

Data is loaded seerately and not relati&ely as in t)e(ase o% tables )ere as it (an be related $sin! inde-'


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'4A/ x 5 2

+yname /&&6UP 0ame,x 7)

*8 9*07) 5 9&0

:8&&T T'STS!&R' T&TS!&R'S

':!'PT Printit

'0#*8

Purpose of index

*ndex sets the startin point for lookup to bein

*f lookup is successful index contains the element number where

lookup value is found.

:8&&T offers 3uick way to add each element toether until

total is derived from the end.

8ield name specified in the result field holds the sum of the

array elements.


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Pre.R$nti"e Array

? T*ST?I,* CT ? 11 DIS

D NA* S 10 DI230

P*RRCD25

?RO?I,*2Test?ileTO?I,*2Test?ile

D T*STSCOR* S =0 DI230

A,T2Na"e

*T?T2P ?ile to be de(lared in (o"bined "ode as re(ords are

()an!ed d$rin! e-e($tion' T)e &al$es in t)e %ile are ()an!ed a%ter t)e ro!ra"

e-its'


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#: S ( )

# +yname S ;) *0oe?

# T&TScore S ( )

! '4A/ x 5 2

! +yname /&&6UP 0ame,x 7)

*8 9*07) 5 9&0

'4A/ T'STS!&R' 5 77

:8&&T T'STS!&R' T&TS!&R'S

':!'PT Printit

'0#*8

'4A/ 9*0/R 5 9&0

R'TUR0

&@PR*0T Printit2

0ame,x ;-

TestScores < ()

( =T&TA/B?

T&TS!&R'S < C;


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R$n Ti"e Arrays

T)e e-a"le $ses two arrays )oldin!na"es and asso(iated s(ores'

T)e ro!ra" rints t)e ori!inal se$en(e

T)e na"e array is sorted in as(endin!order and rinted

T)e s(ore array is sorted in as(endin!

order and rinted' T)e e-a"le ill$strates r$nti"e o&erlayin!

o% arrays'


18/23

?T*ST?I,* I? * DIS

?EPRINT O ? 5=1 PRINT*R

D DS

DSTUD*NTS 1= DI23D Na"e 10 O&er,ay2St$dentsF5

DTestS(ore = 0 o&erlay2St$dentsF15

D In#

D- S = 0

DArraySi#e S = 0

IN2H*le"2St$dents


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7.................................

7 ,oad T)e Arrays

7.................................

C DOU 7In90 @ 7On

C Read StRe( 90

C I% 7In90 @ 7o%%

C *&al - @ - 5C I% - J@ ArraySi#e

C *&al Na"e2 @ STN

C *&al TestS(ore2 @ STSCC *ndI%

C *ndI%

C *ndDo

7.........................................


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9"""""""""""""""""""""""""""""""""""""""""

9Print Array !ontents in &riinal Se3uence

9"""""""""""""""""""""""""""""""""""""""""

! 'xcept Dead2

! #o ArraySi$e :

! 'xcept Print*t

! 'nd#o

9""""""""""""""""""""""""""""""""""""

9 Sort Arrays %y 0ame And Reprint

9""""""""""""""""""""""""""""""""""""

! Sorta 0ame

! 'xcept Dead;

! #o ArraySi$e x

! 'x!ept Print*t

! 'n##o

9""""""""""""""""""""""""""""""""""""


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7....................................

7 Sort Arrays +y TestS(ore And Rerint

7....................................

C Sorta TestS(ore

C *-(et


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&9

&@PR*0T ' Dead2 2 )2

& () E"" 0ot Sorted ""E& ' Dead; 2 )2

& () E"" Sorted by 0ame ""E

& ' Dead( 2 )2& (2 E"" Sorted %y Score "?

& ' Print*t 2

& 0ame,: ;-

& TestScore,: ()

&


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Session 9 Tables and Arrays

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