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Data Representation in COBOL

 
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raveendra_ibm
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Joined: 07 Jan 2006
Posts: 31

PostPosted: Sat Jan 07, 2006 7:01 pm    Post subject: Data Representation in COBOL
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Hi All,

Here is a sample code...

A PIC X(04) VALUE IS 'KLMN'.
B REDEFINES A PIC S9(04).
ADD 1000 TO B.
DISPLAY B.

This gives 134E as answer.

Could anyone please let me know how the data is actually stored and how this operation is actually performed.

Thanks and Regards,
Raveendra.
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DavidatK

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Joined: 22 Nov 2005
Posts: 700
Location: Troy, Michigan USA

PostPosted: Tue Jan 10, 2006 3:59 am    Post subject: Re: Data Representation in COBOL
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raveendra_ibm,

I just answered, I hope, this question for another member. Check this topic. if it doesn't answer your question please come back

http://www.ibmmainframes.com/viewtopic.php?t=7951&start=0&postdays=0&postorder=asc&highlight=

Luck,

Dave
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iknow

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Joined: 22 Aug 2005
Posts: 413
Location: Colarado, US

PostPosted: Tue Jan 10, 2006 9:10 am    Post subject: Re: Data Representation in COBOL
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Hi Raveendra,

Since you're trying to move an Alphanumeric value to a numeric field, the compiler rules dictate that the sending field be numeric and unsigned.

For example


Quote:
WORKING-STORAGE SECTION.
01 A PIC X(04).
01 B PIC 9(04).
PROCEDURE DIVISION.
MOVE 'ABCD' TO A
MOVE A TO B
DISPLAY 'VALUE OF B IS : ' B
STOP RUN.


In the above example since you're trying to move X'C1C2C3C4' (an A/N value) to a numeric field, the compiler rules dictate that the sending field be numeric and unsigned.

It looks like it doesn't care about the non-sign digits (GIGO), but forces the 4 high order sign bits of the low order digit to X'F', overlaying the X'C' that's there. Since the low order bits of that digit is X"4" the full byte is X'F4' or a DISPLAY "4".


Hope this helps.


Please let me know if I am wrong.
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