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REWRITE statement:
The REWRITE statement is used to update the existing record in a disk file.
The normal format is as shown below:
REWRIE record-name [ FROM identifier ]
It may be keep in mind that the syntax is similar to that in the situation of a WRITE statement and the FROM option has similar meaning.
There are some restrictions when these procedures are used. (i) The Procedure should not contain any SORT/MERGE statement. (ii) An explicit transfer of the control outside
RULES FOR SEARCH VERB: The rules apply for the SEARCH verb is as shown below: (1) The SEARCH verb can be applied only to a table that has the OCCURS clause and INDEXED phra
ARITHMETIC VERBS: Most of the problems need some computations to be performed on the input or intermediate data that are numeric in nature. The Arithmetic verbs are used to pe
RULES OF MOVE VERB: The Data movement is managed by the rules which are as shown below: (a) The contents of the identifier - 1 or the value of the literal - 1 is moved to
File Activity: The file activity is a measure of the proportion of records processed during an update run. Therefore we define the activity ration as shown below. Activi
Edit Characters for Numeric Data: The characters below can be used in the PICTURE clause to indicate the editing. Z * $ - + CR DB . , B O /
Second form of Divide verb: The second form of this verb is as shown below: In this situation the identifier-1 or numeric- literal-1 will be divided by identifier-2 or
PROGRAM FOR PERFORM - THRU: We have to write a program to elaborate PERFORM ...THRU statement Identification division. Program- id. Perfthru. Environment division.
Occurs Clause: Let us establish tables with the help of an illustration. Assume that there are ten different types of income-tax rates that are read from some input medium and
PROCEDURE DIVISION statements for the indexed files: All the statements which are available for a relative file are also available for an indexed file. READ STTATEMENT :
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