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Confusion in READ statement if the file is empty

 
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dipanshu

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Joined: 16 Jan 2006
Posts: 53
Location: pune

PostPosted: Wed Feb 08, 2006 6:38 pm    Post subject: Confusion in READ statement if the file is empty
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READ FILE1
AT END
MOVE 'NO' TO ARE-THER-MOR-RECS
NOT AT END
PERFORM CHK-STATUS

Confusion - If the file is empty will it execute (chk-status para) ie not-end part

Pls assist
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Rupesh.Kothari

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Joined: 27 Apr 2005
Posts: 464

PostPosted: Wed Feb 08, 2006 7:03 pm    Post subject: Re: confusion in read stmt
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HI,

Quote:
READ FILE1
AT END
MOVE 'NO' TO ARE-THER-MOR-RECS
NOT AT END
PERFORM CHK-STATUS

Confusion - If the file is empty will it execute (chk-status para) ie not-end part



If file is empty then it will not execute CHK-STATUS

Hope this helps

Regards
Rupesh
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umeshkmrsh

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Joined: 21 Sep 2005
Posts: 79
Location: India

PostPosted: Fri Feb 10, 2006 5:35 pm    Post subject:
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umeshkmrsh wrote:
It will not execute CHK-STATUS.
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priti

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Joined: 29 Sep 2005
Posts: 3

PostPosted: Fri Feb 10, 2006 6:54 pm    Post subject: Re: confusion in read stmt
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The file being empty, the 'AT END ' clause will be executed
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mmwife

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Joined: 30 May 2003
Posts: 1592

PostPosted: Sat Feb 11, 2006 6:14 am    Post subject:
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Hi,

There are 2 kinds of empty:

1) If the file was never opened/closed, it is uninitialized and not a valid file.

2) If it was opened/closed but never written to, it is a valid file with no records.

In the 1st instance, if you attempt to open the file, it will produce an error.
In the 2nd, the open is successful and the 1st read produces an EOF condition.
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