COBOL_Training_Class-8.ppsx

7/27/2019 COBOL_Training_Class-8.ppsx

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Control SequenceVerbs

COBOL Training Class-8


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STOP RUN

GOTO

GOBACK

EXIT

EXIT-PROGRAM

PERFORM

Control Sequence Verbs


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CONTROL VERBS

STOPRUNis used to stop programs and return the control

back to OS (MVS). Do not use STOP RU in sub programs.

EXITis used to e!it paragraph or program i" #$%T %S US#D the

its must be the onl& entr& in that paragraph. the e!itstatement does nothing. %" EXIT-PROR!"is used to e!it a

subprogram

OB!C#is used to e!it programs. 'hen used in called

program it has the same e""ect o" #$%TPROR*Mstatement

and +hen used in main program +orks as STOPRU.

OTOis used to trans"er control to another part o" the

program, -ontrol +ill not return back.


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PERFORM: Passes the control to specified paragraph, But

control will return back.

Perform is of two types: 1. INLIN P!"#!$

%.#&'LIN P!"#!$

ININEPERFORM: 'he statements lie In between the scope of

perform ( P!"#!$ ) N*+P!"#!$

OUTINEPERFROM: 'he statements lie with+in a paragraph,

control returns back to the ne-t statement of it.

PERFORM IN !ETAI


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T$%es O& Per&or's(

1. impleperformis used to e-ecute the referenced code one time

%. PerformNtimesis used to e-ecute the code multiple times. theactual number of times is indicated by identifier or integer.

/. Perform&ntilconditionis used to e-ecute the code multipletimes but dependent upon the &N'ILcondition. 'he conditionwill be tested before the code is actually testes unless the 0I'

''2"'!is included.

3. Perform'hruis used to e-ecute code from one particularparagraph to another in se4uence.

5. Perform6aryingis used to e-ecute multiple times by using72!8IN9phase used to count in a 6ariable.


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ynta- :

P!"#!$ P!"#!$N'I$ P!"#!$&N'IL#N*I'I#N

'2'$N'1 '2'$N'1 '2'$N'1

'2'$N'% '2'$N'% '2'$N'%" " "

. . .

N*+P!"#!$. N*+P!"#!$. N*+P!"#!$.

Note# No I$%l&c&t ter$&n'tor &n bet(een t)e sco%e"

ININE PERFORM


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Nee) to #no*

'he P!"#!$and N*+P!"#!$statements bracket all

#B#L II statements between them.

In line P!"#!$swork as long as there are no internal

9#'#s, not e6en to an ;I'. 'he inline P!"#!$ forreadability should not e-ceed a page length it would be better

to put the code in a separate Para and use P!"#!$

Para+name rather than in+line perform.


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OUTLINE PER+OR"

#&'LIN perform statement causes the program to transfer control to

another paragraph, e-ecute all the statement within the paragraph, and

return to the statement following the P!"#!$ statement.

S*nt'+

PERFORMPARANAME"

PERFORMPARANAMEN TIMES"

PERFORMPARANAMEUNTICON!ITION"

PERFORMPARANAME,TRUPARANAME."

PARANAME"

STATEMENT,"

STATEMENT."

. . . . .


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TEST BE+ORE , !+TER

If ''B"#!is specified, the condition is

tested at the beginning of each repeated e-ecution

of the specified P!"#!$ range.

If ''2"'!is specified, the condition is

tested at the end of the each repeated e-ecution of

the P!"#!$ range. 0ith ''2"'!, the

range is e-ecuted at least once.


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I! !IVISION"

PROGRAM-I!" EMP!ETPG"

ENVIROMENT !IVISION"

!ATA !IVISION"

/ORKING-STORAGE SECTION"

0, /S-EMP!ET"

01 EMPI! PIC X213 VAUE SPACES"

01 ENAME PIC X2,03 VAUE SPACES"

01 EOC PIC X2,03 VAUE SPACES"

01 ESA PIC 4213V42.3 VAUE SPACES"

PROCE!URE !IVISION"

MAIN-PARA"

PERFORMACCEPT EMPI!

ACCEPT ENAME

ACCEPT EOC

ACCEPT ESA

!ISPA5 /S-EMP!ET

EN!-PERFORM" STOP RUN"

EXAMPE-,


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P!#*&! *I7II#N.

$2IN+P2!2.

P!"#!$ 2P'+P2!2.

P!"#!$ *IPL28+P2!2.

'#P !&N.2P'+P2!2.

2P' $PI*.

2P' N2$.

2P' L#. 2P' 2L.

*IPL28+P2!2.

*IPL28 0+$P*'.

EXAMPE-.


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+e* Ti%s to Re'e'ber

1. &se the P!"#!$statement to access code which needs to bee-ecuted from more than one location.

%. &se the P!"#!$ statement to structure your code. $ake a mainroutine that P!"#!$#'! !#&'IN.

/. &se the 0I' ''2"'!option to force the code toP!"#!$* at least once.

3. If the number of lines in the routine is relati6ely small. &se an in+lineP!"#!$ instead of outline P!"#!$.


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Tr$ Out

0, /S-NPIC 42.3VAUE 6ERO"

A-PARA"

MOVE 1TO /S-N"

PERFORM B-PARA/S-NTIMES"

B-PARA"

MOVE ,0TO /S-N"

O/ MAN5 TIMES /I B-PARA BE EXECUTE! 7


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Tan. /ou

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COBOL_Training_Class-8.ppsx