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How to check whether the file is sorted or not?

 
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v.suresh

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Joined: 29 Jun 2007
Posts: 5
Location: Bangalore

PostPosted: Tue Aug 28, 2007 6:46 pm    Post subject: How to check whether the file is sorted or not?
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Hi Friends,

How to find whether the file is sorted or not in cobol?Plz give explanation with coding?
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dbzTHEdinosauer

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Joined: 20 Oct 2006
Posts: 6966
Location: porcelain throne

PostPosted: Tue Aug 28, 2007 6:56 pm    Post subject:
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to check whether a file is sorted or not, you have to compare the previous record to the current record. If the previous record (or the key portion of the record) <= the current record then the file is sorted.
Code:

01  WS-PREV-REC       PIC X(??) VALUE SPACES.

01  WS-CURR-REC       PIC X(??).

Code:

READ FILE INTO WS-CURR-REC

IF WS-CURR-REC > WS-PREV-REC
THEN
     MOVE WS-CURR-REC
         TO WS-PREV-REC
ELSE
     DISPLAY 'RECORDS NOT SORTED'
     GOBACK
END-IF
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dbzTHEdinosauer

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Location: porcelain throne

PostPosted: Tue Aug 28, 2007 6:58 pm    Post subject:
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v.suresh,

I would not advertise that you work for IBM, India, if I were you.
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dick scherrer

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Joined: 23 Nov 2006
Posts: 19270
Location: Inside the Matrix

PostPosted: Tue Aug 28, 2007 7:11 pm    Post subject:
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Hello,

When a file is sorted, it is usually sorted by one or more "sort keys" (rather than the entire record).

Code (similar to the example posted) needs to check "this" sort key(s) against the previous sort key(s) to detemine if the file is "in sequence".
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