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Rules of read statements:
The next record is identified according to the rules as shown below:
(i) Whenever the READ NEXT statement is the initial statement to be executed after the open statement on the file, the next record is the initial record of the file.
(ii) Whenever the execution of the READ NEXT statement follows the execution of the other READ statement on similar file (format 2 or format 3), the next record is the record following the one previously read.
(iii) Whenever the execution of the READ NEXT statement follows the execution of the start statement.
PROGRAM FOR PERFORM - VARYING: We have to write a program to elaborate PERFORM ...VARYING Identification division. Program- id. PerfVary. Environment division. Dat
DELETE STATEMENT : The file should be opened in the I-O mode. If the access is SEQUENTIAL, the INVALID KEY phrase must be specified. Rather than, the last input-output state
Example of add verb: (a) ADD A TO B. This illustration represents that the value of A will be added to the value of B and the result will be stored in B. The alignment of
CONDITIONS-NAME CONDITION: The condition name is an entity which itself is a condition and these can have either a true or false value. Though, a condition name cannot be d
PROGRAM TO DEMONSTRATE SORT VERB: The file for which a record having 2 fields, viz., Account Number and Name is already available. Sort the file based on the ascending order o
Example of constructing an arithmetic expression: An arithmetic expression may be proceeded by a + or - sign. These operations are known as unary + or unary - operators. Il
PROCEDURE DIVISION statements for the relative files: The statements OPEN, CLOSE, READ, WRITE and REWRITE that are available for sequential files are also available for the re
FILE DESCRIPTION- FIXED-LENGTH RECORDS: The normal characteristics of a file are explained in the file description (FD) entry of the DATA DIVISION.
ON SIZE ERROR OPTION: Whenever a size error occurs, the contents of the result field after the operation is unpredictable. Though, the processing is not-terminated and the co
Example of Perform statement: PERFORM BEGIN-CALCULATION THRU END-CALCULATION. Assume, BEGIN-CALCULATION and END-CALCULTION is paragraph names. The execution of the PERFORM
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