Empty work file

An empty work file is a work file which contains no records. This is generated when

• EDT is started or

• when the work file is completely deleted with @DELETE (Format 2), @DROP or other statements which implicitly execute a @DELETE (Format 2) or

• in F mode, when all the lines are deleted with the statement code D or M or when all the lines are deleted with @DELETE (Format 1), @MOVE or @ON (Format 8 or 10).

In dialog operation, an empty work file can be recognized by the fact that it contains no records. In EDT procedures, it is possible to use the @IF statement (Format 3) to check whether a work file is empty.

It is possible to write an empty work file. In such cases, the character set configured for the work file may also be configured for the file depending on the operands set for the relevant statement.

The properties of a work file when EDT is started are indicated in the table in the preceding section. All the work file properties defined with the @PAR statement, with the exception of those explicitly listed below, are retained following a delete operation.

The table below collates the additional properties of a work file following deletion.

Properties	Values after deletion with @DELETE (Format 2) or @DROP	Values after the deletion of all the present lines
General
Current character set for the work file	*NONE	Not changed
Work file occupied (only for work files 1 to 22)	None (apart from current)	Yes
Work file empty	Yes	Yes
Work file modified	No	Yes
Save file present	Save file deleted	Save file deleted
Line numbers
Current line number (symbolic line number *)	1.	0 + Current increment value
Current increment value	1.	Not changed
Lowest assigned line number (display by means of @LIMITS)	0.0000	0.0000
Symbolic line number %	1.	==*
Highest assigned line number (display by means of @LIMITS)	0.0000	0.0000
Symbolic line number $	1.	==*
Symbolic line number ?	0.0000	Not changed
Memory area (Format 6)	Empty	Not changed
File processing
Link to file name	No link	Not changed
Link to open file	No link (implicit @CLOSE executed)	Not changed (can be revoked with @CLOSE)
Input
Unicode substitute character including for data	Off	Not changed
Data window-specific representation
First line displayed in data window 1	0.0000	0.0000
First column displayed in data window 1	1	Not changed
First line displayed in data window 2	0.0000	0.0000
First column displayed in data window 2	1	Not changed
Other
Indicator for hits on last @ON for @IF (Format 3)	Off	Not changed
Column for hits on last @ON for @IF (Format 3)	0	Not changed