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NUMPROC(NOPDF) VS NUMPROC(PDF) - How does they work ?

 
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xpower

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PostPosted: Sat Mar 21, 2009 7:39 am    Post subject: NUMPROC(NOPDF) VS NUMPROC(PDF) - How does they work ?
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Hello everyone,

01 A PIC X(08).
01 B PIC 9(04).
01 C REDEFINES B PIC 9(08) COMP.

I got S0C7 abend using following statements with NUMPROC(PDF) compile option .
MOVE ' a' TO A. ==> first 7 byte is space,last byte is lowercase not uppercase.
MOVE A TO C. ==> this statement results in S0C7

However, there is no abend if I use the compile option NUMPROC(NOPDF).

what i know is that NUMPROC(PDF) will validate the sign however, the other one doesn't consider the sign.

Could anyone or expert tell me how does ' a' makes abend with NUMPROC(PDF) ? that is how does the COBOL process it in details ?

Thank you very much for anyone thinking it about !!
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xpower

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PostPosted: Sat Mar 21, 2009 7:45 am    Post subject: Reply to: NUMPROC(NOPDF) VS NUMPROC(PDF) - How does they wor
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Hi,

A should be 'BBBBBBBa' B means blank not character B .
in other words, if the lowercase appears in the last byte, the statement will always abend with S0C7 with NUMPROC(PDF) however when A is 'aBBBBBBB' whatever B is blank or not, the statment will not abend.
I think the point is the last byte, but i don't know how does it work or process ?
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dick scherrer

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PostPosted: Sat Mar 21, 2009 8:02 am    Post subject:
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Hello,

Why did you use NUMPROC at all? There is typically no reason to do so - especially with the situation from the posted example.

Actually, the posted example should never be used - it is invalid. There is no continuity in the example at all. . . If the goal was to learn something, i believe the lesson learned should be that such an example is just confusing takes away from learning something worthwhile.

As a bit of a guideline: Redefines should be the same size. Binary should not be used to redefine zoned-decimal. Pix X fields should not be moved to numeric fields without first making sure they are numeric.

If you are interested in NUMPROC, look here:
http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/handheld/Connected/BOOKS/igy3pg40/2.4.35?
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xpower

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PostPosted: Sat Mar 21, 2009 9:08 am    Post subject: Reply to: NUMPROC(NOPDF) VS NUMPROC(PDF) - How does they wor
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Dear Sir dick,

Firstly, Thank u for your reply and useful link.
Actually it is applied in my work environment, and I am also confused
why it is designed like this. One more thing, I cannot REMOVE NUMPROC(PDF) option because it is not applied in learning but PROD. and the copybook seems not be changed. Just confused why the last byte lowercase result in abend..
Anyway, Thank you so much indeed. :)
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dick scherrer

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PostPosted: Sat Mar 21, 2009 9:29 am    Post subject:
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Hello,

Quote:
and the copybook seems not be changed
It may help if you post the actual copybook.

Quote:
Just confused why the last byte lowercase result in abend
The lowercase "a" does not have a valid sign. Why would a production program have a literal of several blanks followed by a lowercase "a" being moved around as in the posted example?

The best way for us to help is for us to see the "real" code not some similar example code.
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xpower

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PostPosted: Sat Mar 21, 2009 10:53 am    Post subject: Reply to: NUMPROC(NOPDF) VS NUMPROC(PDF) - How does they wor
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Sir dick,

actually in prod is the value is '12345pge', the 'BBBBBBBa' is just test in the development. the copybook is defined similarly in the post. and code is same as the ones above. just the value is different.
sorry. currently i am unable to post them right now... ^-^
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dick scherrer

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PostPosted: Sat Mar 21, 2009 11:28 am    Post subject:
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Hello,

Quote:
currently i am unable to post them right now
When you are able, please post the entire copybook (unless it is extremely large) and the operational code there are doubts about.

Is the field B used in the real code?

Simply said the 0c7 is due to an invalid sign.
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Bill O'Boyle

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PostPosted: Sat Mar 21, 2009 4:00 pm    Post subject: Reply to: NUMPROC(NOPDF) VS NUMPROC(PDF) - How does they wor
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Here's an example -

With NUMPROC(NOPFD), whenever two packed-decimal fields are compared, a CP (compare packed/decimal) instruction is issued. If one field has a 'C' sign-nibble and the other has an 'F' sign-nibble, a CP considers both of them "Positive". If the numeric portions of both are the same, then an "EQUAL" condition code is raised.

With NUMPROC(PFD), whenever two packed-decimal fields are compared, a CLC (compare logical character) instruction is issued instead of a CP. If one field has a 'C' sign-nibble and the other has an 'F' sign-nibble, a CLC will raise a "NOT EQUAL" condition code, which causes program logic discrepancies, even though the numeric portion of each field are equal.

I'm not a big fan of NUMPROC(PFD) and although a CLC is a more efficient instruction than a CP, I'll take the hit and default to NUMPROC(NOPFD). There's too much risk when the packed-decimal data can't be trusted and the sign-nibbles may not be the same.

Also, a CLC won't raise a S0C7 and could make things even worse further down in the code, when the "NEXT" packed-decimal instruction is issued (IE: AP) and the packed-decimal data is invalid. A CP with bad packed-decimal data will raise a S0C7 whenever there's invalid packed-decimal data in the "NEXT" packed-decimal instruction.

Regards,
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Terry Heinze

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PostPosted: Sun Mar 22, 2009 7:26 am    Post subject:
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"Also, a CLC won't raise a S0C7 and could make things even worse further down in the code, when the "NEXT" packed-decimal instruction is issued (IE: AP) and the packed-decimal data is invalid."
Amen to that. Give me the S0C7 now and let me fix the source of the problem instead of allowing garbage to propogate further.
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xpower

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PostPosted: Sun Mar 22, 2009 10:35 am    Post subject: Reply to: NUMPROC(NOPDF) VS NUMPROC(PDF) - How does they wor
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Sir dick,

the copybook is (output file using these field)
Code:
10    XXXX                             PIC 9(04).           
10    YYYYY          REDEFINES XXXX    PIC 9(08) COMP.

the other field in another copybook (input file using this this field)
Code:
10    A                                PIC X(08).


the field in the working-storage in the program.
Code:
10    WS-B                            PIC 9(08).

the code is
Code:
MOVE A                               TO    WS-B
MOVE WS-B                            TO    YYYY

the A value in PROD is 1201P3ge

Yes, i agreed with you that the abend resulted from the invalid sign, could you tell me why ? what the valid sign should be ? i am confused about it exactly. Thank you so much !!
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xpower

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PostPosted: Sun Mar 22, 2009 10:46 am    Post subject: Reply to: NUMPROC(NOPDF) VS NUMPROC(PDF) - How does they wor
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Sir Bill & Terry,

Thank you for your reply and your opinions . when should we use NUMPROC(PDF) ? here we just move one field to another one. no other process in two fields. yeah, i don't know why NUMPROC(PDF) is used. I have no choice.hehe..
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dick scherrer

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PostPosted: Sun Mar 22, 2009 11:03 am    Post subject:
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Hello,

What is the desired result in YYYY after the moves? Does anyone have an expected value?

Quote:
the abend resulted from the invalid sign, could you tell me why
The "input" data (1201P3ge) is invalid to use as a numeric field. Is it possible that only the first 4 positions should be used (1201)?

Within the scope of the process, what do these instructions accomplish/contribute as related to the ovreall working of the module?

Please note that your last reply has been "Code"d (using the "Code" tag at the top of the reply panel) - this greatly aids readability and preserves alignment. When you prepare a post, use Preview to see your post as it will appear on the forum - you may preview multiple times. When you are satisfied with the appearance of your post, Submit.
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xpower

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PostPosted: Sun Mar 22, 2009 2:54 pm    Post subject: Reply to: NUMPROC(NOPDF) VS NUMPROC(PDF) - How does they wor
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Sir dick,

Thank you for your nice suggestion. I noticed that.
for this issue, maybe i guess the reason.
for example, 'a' in ebcdic table is X'81', however when it is moved to binary field, the last byte has invalid sign becuase 8 is not accept.
I just tested from 'a' to 'r' that is from (x'81' to x'99'), they are all not correct. and then testd from 's' to 'z' , 'A' to 'Z', they are all correct. because the sign is A,C,D,E (EBCDIC table: http://www.legacyj.com/cobol/ebcdic.html)

Thanks again.
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dick scherrer

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PostPosted: Sun Mar 22, 2009 7:21 pm    Post subject:
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Hello,

Good to hear progress is being made icon_smile.gif

I'm still confused how 1201P3ge might be used as a number icon_confused.gif
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xpower

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PostPosted: Mon Mar 23, 2009 8:26 am    Post subject: Reply to: NUMPROC(NOPDF) VS NUMPROC(PDF) - How does they wor
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Sir dick

we don't care what the original value is but ensure that no abend in batch otherwise it is a nightmare. hehe.
thank you for your previous link so that i can find out the issue. :)
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dick scherrer

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PostPosted: Mon Mar 23, 2009 8:46 am    Post subject: Reply to: NUMPROC(NOPDF) VS NUMPROC(PDF) - How does they wor
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You're welcome - good luck icon_smile.gif

d
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