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cobol statment starting with ON


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Dhanya Praju

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Joined: 16 Jul 2008
Posts: 10
Location: Banglaore

PostPosted: Fri Jul 25, 2008 1:35 pm
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hi,

One existing program has a cobol statment stating with On.
The statment is like

1000-Para.
ON 1
MOVE A to B
GOTO ABC.
Move B to C.

1000-exit-para.

when I try compiling I am getting the compilation error
" "ON" was invalid. Skipped to the next verb, period or procedure-name definition"

Please help
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sedireswarapu

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Joined: 18 Jun 2008
Posts: 28
Location: India

PostPosted: Fri Jul 25, 2008 4:00 pm
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Hi,

I could only get the below information about ON statement. Hope this could be of some use for you.

ON Statement -
OS/VS COBOL accepts the ON statement. IBM COBOL does not
accept the ON statement.
The ON statement allows selective execution of statements it contains.
Similar functions are provided in IBM COBOL by the EVALUATE statement
and the IF statement.
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Dhanya Praju

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Joined: 16 Jul 2008
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PostPosted: Fri Jul 25, 2008 4:14 pm
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But in this case in which case this on 1 is setting to true? what is this ON 1 evaluating for?
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UmeySan

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Joined: 22 Aug 2006
Posts: 771
Location: Germany

PostPosted: Fri Jul 25, 2008 5:13 pm
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Hi !

It's an very old trigger implemented in earlier releases of cobol.
It,s a trigger do to only a action once during the programm.
For example, do an OpenDataset only the first time you come into that section. One-1 will trigger that automatically.

Section:

Move bla bla bla
Move bla bla bla

One 1 Open Output

Move Bla to Out-line
Write Output from Out-Line

The first time, you perform this section, open will be done.
Next times, open will automatically not be done.

I have something in mind, that you also could code on-2, on-3,...
cause that trigger was stept-up ervery time the command was passed.

Now in Cob-2 you have to programm that trigger by yourself or you
build a well-structured programm where there's no need to such triggers.









Exampel:
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sedireswarapu

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Joined: 18 Jun 2008
Posts: 28
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PostPosted: Fri Jul 25, 2008 5:34 pm
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Hi,

Thanks for demystifying the use of 'ON 1' in the above posted code as i could not get much information on it, inspite of searching for it in some of the manuals available.
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UmeySan

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Joined: 22 Aug 2006
Posts: 771
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PostPosted: Fri Jul 25, 2008 5:42 pm
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Sometimes it's not so bad to be past one's prime !!!

Nice Weekend, Guys
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sedireswarapu

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Joined: 18 Jun 2008
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PostPosted: Fri Jul 25, 2008 5:54 pm
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Thanks & you too have a nice weekend...
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