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COBOL "GO TO"


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mohanrazz

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Joined: 30 Sep 2008
Posts: 30
Location: India

PostPosted: Fri Feb 05, 2010 2:09 pm
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Hi All..I have a small query..


Code:
IF WS-IO-NUM NOT NUMERIC THEN
       MOVE ZERO TO WS-IO-FILE-REQUEST-NUM.

    GO TO 210-IO-READ
          215-IO-READ-GTEQ
          220-IO-READ-UPDATE
          225-IO-READ-UPDATE-GTEQ
          230-IO-WRITE
          240-IO-REWRITE
          250-IO-DELETE
          260-IO-UNLOCK
          270-IO-STARTBR
          280-IO-READNEXT
          290-IO-READPREV
          300-IO-ENDBR
          230-IO-WRITE
          310-IO-READ-SET


I have code like above in one of the progs..Does this mean - if my "IF" condition is satisfied all the mentioned lables are executed one after another?? Thanks.
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bhairon singh rathore

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Joined: 19 Jun 2008
Posts: 91
Location: banglore

PostPosted: Fri Feb 05, 2010 2:58 pm
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Hi Mohan,

As Per document it should give control to first Paragraph of goto.
Here it would be

Code:
210-IO-READ


publib.boulder.ibm.com/infocenter/iadthelp/v7r0/index.jsp?topic=/com.ibm.etools.iseries.langref.doc/evfeb4ls02.htm
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mohanrazz

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PostPosted: Fri Feb 05, 2010 3:07 pm
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Bhairon..thanks..
I too have never seen more than one label in GO TO statement..I am still wondering..if this gives control to only first label why the rest of all are coded..this code is very much in live..i still wonder is there any possiblity that all the labels are executed??
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bhairon singh rathore

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PostPosted: Fri Feb 05, 2010 3:13 pm
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Is there any depending upon condition below GOTO
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GuyC

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Joined: 11 Aug 2009
Posts: 1281
Location: Belgium

PostPosted: Fri Feb 05, 2010 3:14 pm
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does it say anywhere near the end depending on
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bhairon singh rathore

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Joined: 19 Jun 2008
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PostPosted: Fri Feb 05, 2010 3:18 pm
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Yes Just have a look on below document

publib.boulder.ibm.com/infocenter/iadthelp/v7r0/index.jsp?topic=/com.ibm.etools.iseries.langref.doc/evfeb4ls02.htm
Quote:
Format 2 (Conditional GO TO)

Description
The conditional GO TO statement transfers control to one of a series of procedures, depending on the value of the identifier. The maximum number of procedure-names for a conditional GO TO statement is 255.
Format 2 (Conditional GO TO)

*---------------*
V +
->->---GO-*--*--procedure-name-1*-DEPENDING--*--*-identifier--><-
*TO* *ON*


procedure-name-1
Procedure-name-1 must be a procedure or a section in the same Procedure Division as GO TO.


Identifier
Identifier must be a numeric elementary data item which is an integer.

If 1, control is transferred to the first statement in the procedure named by the first occurrence of procedure-name-1;
If 2, control is transferred to the first statement in the procedure named by the second occurrence of procedure-name-1, and so forth.
If the value of identifier is anything other than a value within the range of 1 through n, (where n is the number of procedure-names specified in this GO TO statement), no control transfer occurs. Instead, control passes to the next statement in the normal sequence in running the
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mohanrazz

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Joined: 30 Sep 2008
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Location: India

PostPosted: Fri Feb 05, 2010 3:35 pm
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yeah..yes..thanks guys..there is "DEPENDING ON"..i think i missed out that..now it is ok icon_biggrin.gif thx
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bhairon singh rathore

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PostPosted: Fri Feb 05, 2010 3:55 pm
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Good to hear your doubt got cleared icon_wink.gif

But it is always better to make the effort to find out your queries other then depending on others icon_exclaim.gif
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CaptBill

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Joined: 28 May 2009
Posts: 20
Location: Oklahoma City, OK USA

PostPosted: Fri Feb 12, 2010 4:32 am
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I would avoid a "Go TO ... DEPENDING" construct and replace it with an EVALUATE construct. It will be much clearer to the person that comes after you and has to do maintenance.

Always write code for maintenance, and you will make everyone's job easier.
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William Thompson

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Joined: 18 Nov 2006
Posts: 3156
Location: Tucson AZ

PostPosted: Fri Feb 12, 2010 7:01 am
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bhairon singh rathore wrote:
As Per document it should give control to first Paragraph of goto.
Here it would be

Code:
210-IO-READ


publib.boulder.ibm.com/infocenter/iadthelp/v7r0/index.jsp?topic=/com.ibm.etools.iseries.langref.doc/evfeb4ls02.htm

Buzz, wrong answer.....
For the COBOL/400 people:
If the value of identifier is anything other than a value within the range of 1 through n, (where n is the number of procedure-names specified in this GO TO statement), no control transfer occurs. Instead, control passes to the next statement in the normal sequence in running the program.
and for the real mainframers:
If the value of identifier is anything other than a value within the range of 1 through n (where n is the number of procedure-names specified in this GO TO statement), no control transfer occurs. Instead, control passes to the next statement in the normal sequence of execution.
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