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INITIALIZE VERB

 
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mainframe5
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PostPosted: Fri Nov 16, 2007 5:58 pm    Post subject: INITIALIZE VERB Reply with quote

what is INITIALIZE VERB .give me example.
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DavidatK
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PostPosted: Mon Nov 19, 2007 6:46 am    Post subject: Reply with quote

You can read more about the INITIALIZE Statement in the COBOL Manual

The INITAILIZE statement is used to initialize one or more variables to a pre-determined value. It is equivalent to one move statement for each variable.

Given the following code structure:

Code:

01  RECORD-OUT-AREA.
    05  ACCOUNT-NUMBER       PIC S9(9) COMP-3.
    05  FILLER               PIC X.
    05  ACCOUNT-BALANCE      PIC 9,999,999.99
    05  FILLER               PIC X.
    05  NEXT-DUE-DATE.
        15  MM               PIC XX.
        15  DD               PIC XX.
        15  YYYY             PIC XXXX.
       

01  OUTPUT-RECORD-COUNT      PIC S9(9) COMP-3.


Code:

(ex 1)
    INITIALIZE               RECORD-OUT-AREA.

(ex 2)
    INITIALIZE               OUTPUT-RECORD-COUNT.

(ex 3)   
    INITIALIZE               ACCOUNT-BALALNCE.


Is equivalent to:

Code:


(ex 1)
    MOVE 0                   TO ACCOUNT-NUMBER.
    MOVE 0.00                TO ACCOUNT-BALANCE.
    MOVE SPACES              TO MM.
    MOVE SPACES              TO DD.
    MOVE SPACES              TO YYYY.

(ex 2)
    MOVE 0                   TO OUTPUT-RECORD-COUNT.

(ex 3)
    MOVE 0.00                TO ACCOUNT-BALANCE.


There are issues with the INITIALIZE statement however. INITIALIZE does nothing with FILLER areas and creates a move statement for every variable.

If the OUTPUT-RECORD-AREA was a table item INITIALIZE would create a MOVE for every variable for every table subscript.

Now imagine a structure that may have hundreds or thousands of valuables in it. I think you can see that the over use of the INITIALIZE statement can have a dramatic affect on the performance of the program.

A better way to get the same results, with much better performance is to INITIALIZE the structure once at the start of you program; you should have an initialization paragraph. After doing the INITIALIZE, move the structure to a save area of the same structure, it can be all filler, as below:

Code:

01  RECORD-OUT-AREA-INIT_SAVE.
    05  FILLER               PIC S9(9) COMP-3.
    05  FILLER               PIC X.
    05  FILLER               PIC 9,999,999.99
    05  FILLER               PIC X.
    05  FILLER.
        15  FILLER           PIC XX.
        15  FILLER           PIC XX.
        15  FILLER           PIC XXXX.


INITIALIZE RECORD-OUT-AREA.
MOVE RECORD-OUT-AREA  TO RECORD-OUT-AREA-INIT-SAVE.


Then, whenever you need to initialize the RECORD-OUT-AREA, simply

Code:

MOVE RECORD-OUT-AREA-INIT-SAVE TO RECORD-OUT-AREA.


There are other options for the INITIALIZE Statement, but not normally used. You can read about those in the manual.

Dave
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PostPosted: Wed Jan 27, 2016 8:14 pm    Post subject: Topic deleted by Admin Reply with quote

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