COBOL_Training_Class-10.ppsx

7/27/2019 COBOL_Training_Class-10.ppsx

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IBM Mainframes

COBOL Training Class-11


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Understand the Problem

01 TEMP-REC. 05 ONE-AMPIC S9(3).

05 TWO-AMPIC S9(3).

05 THREE-AMPIC S9(3). 05 FOUR-AMPIC S9(3).

05 MIDNIGHTPIC S9(3).

CALCULATION:

COMPUTE AVG-TEMP ( ONE-AM! TWO-AM! THREE-

AM! . ! MIDNIGHT) " #$.


3/15

Introduction to OCCURS Clause

We use an OCCURSClause in COBOL to indicate the

repeated occurrence of fields with same format (Type & Size).

Some of the ses are!

"efinin# a series of $%O fields of same format

"efinin# a series of totals in worin#'stora#e section

"efinin# a tale to accessed y each record.

* T+,-'+C.

/ WS'T+,- OCCS 01T$,+S -$C S2(3).

* 445'* 64L+ 7+O. / TOT4LS OCCS /T$,+S -$C 2(/).


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Rules to use

4n occurs clause may e used on le8els 0 9 12

only i.e.: occurs is not 8alid for *%;;%


5/15

Subscrit

A SUBSCRIPTis used in the procedure division to

indicate which specified item within the array we wish

to access.

We use subscript aon! with the identifier that is

defined with in occurs " to refer to an item with in thearray

#$ampe%

!CC"PT #S-T"MP $1% & !CC"PT #S-T"MP $'(%

In between & and '( ony but not ) or '*.

Rules% one space after the variabe and eft

parenthesis and no space after or before the

parenthesis.


6/15

#e can resol)e the other roblem

+,-# & T, SUB. +,-# #R,S T,T,TA/0T#+P.

P#R1,R+ U2TI/ SUB3 '(

A44 WS0T#+P5 SUB6 T, T,TA/0T#+P

A44 & T, SUB

#240P#R1,R+.

P#R1,R+ CA/0PARA -AR7I28 SUB 1R,+ & B7 & U2TI/ SUB

3'(.

CA/0PARA

C,+PUT# T,TA/0T#+P9T,TA/0T#+P: WS0T#+P5SUB6 .


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COBOL OCCURS***+"P",+I, O,

This is similar to the COBOL OCCS clause: e?cept the

numer of times it occurs 8aries from record to record.

/ L$>+'$T+,'CO>T-$C 22.

/ L$>+'$T+,SOCCS TO 0/T$,+S "+-+>"$>@O> L$>+'$T+,'CO>T.

* A4>T$T5-$C 2222.

* "+SC$-T$O>-$C (3).

* >$T'-$C+-$C S2(/)622.The tale L$>+'$T+,Scontains three fields A4>T$T5:

"+SC$-T$O>: >$T'-$C+) which mae up one line on an

in8oice. +ach in8oice can ha8e from to 0/ line items.


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S"!RC. T"C.,I/U"S

Search is used to find on element from the tale.

There are 0types of search techniues.

S+4CD & S+4CD 4LL

SEARCH: $n Search the records will e checed in a linear orseuential fashion until a match is found or until end of the

tale (+OT).

SEARCHALL: $n Search all it di8ides the tale into 0 euals

half and it checs for the element either in first half or second

half ased on element. $t eeps on di8idin# the tale into 0

eual half until a match is found or until tale looup is

completed.


9/15

The I,+"0"+ B Clause

When usin# a S+4CDstatement: tale entries must e specified

with an inde?rather than a suscript.

4n inde? is similar to a suscript: ut it is defined alon# with the tale

entries as part of the OCCSdescription!

* S4L+S'T4'T4BL+.

/ T4BL+'+>T$+S OCCS * T$,+S

$>"++" B5 *.

* WS'7$-CO"+ -$C 2(/).

* WS'T4'4T+ -$C 6222.


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S"!RC.

DATA DIVISION.01 ACCT-DETAILS.

05 ACCT-DETAILS OCCURS 100 TIMES INDE%ED &' A1.

10 ACCT-NO PIC 9(10).

10 CUST-NAME PIC %(#0).

WS-NAME PIC %(#0) VALUE SPACE.

PROCEDURE DIVISION.

SEARCH-PARA.

SET A1 TO 1.

SEARCH ACCT-DETAILS

AT END DISPLA' RECORD NOT FOUND*

WHEN WS-NAME CUST-NAME(A1)

DISPLA' ACCT-DETAILS(A1)

END-SEARCH.


11/15

S"!RC. !LL

DATA DIVISION.

01 ACCT-DETAILS.

05 ACCT-DETAILS OCCURS 100 TIMES ASCENDING +E' IS

ACCT-NO INDE%ED &' A1.

10 ACCT-NO PIC 9(10).

10 CUST-NAME PIC %(#0). WS-NAME PIC %(#0) VALUE SPACE.

PROCEDURE DIVISION.

SEARCH-PARA.

ACCEPT WS-NAME.SEARCH ALL ACCT-DETAILS

AT END DISPLA' RECORD NOT FOUND*

WHEN WS-NAME CUST-NAME(A1)

DISPLA' ACCT-DETAILS(A1)

END-SEARCH.

SEARCH SEARCH ALL


12/15

SEARCH SEARCH ALL

LINEAR " SE,UENTIAL SEARCH. &INAR' SEARCH.

I /2 /24 // 46 7/ 8 46/4/.

R/24 4 7/ 8 46/ 4/.

W/ ;/ 64 /6 8/< ;87/ 64 1 7/=4/

>/=4?8@ /2.

N4 // 64 /6 8/< ;87/ 64 1 6/

/24 / 8 46/ 4/.

AB 4@82 4>/684 2 7/ >/=4?/.

( N46)

OB 4>/64 8 >487/.

M68>/ /* 248684 2 7/ 24/. OB 8@/ /* 248684 2 7/

24/.

S/2 8 >/=/7/ / 67/ 8 ?. P/=/7/ / 67/ 8 @/.

W/ 4*6 24/ ASC-+E' OR DSC-+E'. S4 24/ ASC-+E' OR DSC-+E'.


13/15

+ifference Bet2een

SU&SCRIPT INDE%

O22/2/: 86 86/B 24;/6 648>2/?/6 =/62/ 6/ ;/.

D8>2/?/6: 86 4 6/ / 4= 6/;/ 8/26B =/62/ 6/ ;/.

S4/. F6/.

S728>6 8 48@-64@/ ;87/. I/< 8 86/ 86/?.

I6 4 7/ /2/ 8 48@-64@/

/2684.

N4 // 64 /2/ 8/< ;87/.

I6 2 7/ I2/?/6/"D/2/?/6/

86 24?>6/ 4 >/=4?.

COMPUTE ++!1 (OR)

COMPUTE ++-1 (OR)

PERFORM VAR'ING.

T4 82/?/6 8/< / ;/ 64 / SET

;/7.

SET INDE%-VAR TO 1 OR

SET INDE%-VAR UP &' 1"(++!1)

OR

SET INDE%-VAR DOWN &' 1"(++-

1)


14/15

Limitations of the S"!RC. !LLStatement

*. The condition followin# the word WD+> can test only foreuality!

V8: WHEN T-CUSTOMER-NO (%1) CUST-NO-IN

I;8: WHEN T-WEIGHT-MA% (%1) WEIGHT-MAILED

0. . Only one WD+> clause can e used with aS+4CD 4LL.

3. The 645$>@option may not e used with the

S+4CD 4LL.

1. The OCCS item and its inde?: which define the talear#ument: must appear to the left of the eual si#n.

V8: WHEN S-AMT (%1) AMT1...

I;8: WHEN AMT1 S-AMT (%1)...


15/15

Than3 ou

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COBOL_Training_Class-10.ppsx