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RELATIONAL CONDITION:
We know that a relational condition specifies a comparison between two operands and has the form.
Operand-1 relational-operator operand-2
where the relational-operator can be anyone of the shown below:
IS [NOT] GREATER THAN
IS [NOT] > THAN
IS [NOT] LESS THAN
IS [NOT] < THAN
IS [NOT] EQUAL TO
IS [NOT] =
It was acknowledged earlier that the operands can be an identifier or a literal. Though, either operand can also be an arithmetic expression but should contain at least one reference to an identifier. Occasionally, operand-1 and operand-2 are respectively referred to as the subject and object of the relational condition.
INDEXED SEQUENTIAL FILES: In the indexed sequential files which are also known as indexed files, the records are stored in the sequence order generally in ascending order. In
COMPOUND CONDITION: The two simple conditions can be connected by the logical operators AND or OR to form a compound condition (also termed as combined condition). When two co
FILE DESCRIPTION- FIXED-LENGTH RECORDS: The normal characteristics of a file are explained in the file description (FD) entry of the DATA DIVISION.
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
READ STATEMENTS: The common format for the read statements is as shown bellow. Format 1: READ file-name RECORD [ INTO identifier ] [ ; AT END imperative-s
Illustration of if- else statement: IF OK-BALANCE NEXT SENTENCE ELSE MOVE 2 BALANCE-CODE In this illustration, the OK-BALANCE is a condition name. No action is specific if
READ STATEMENT: The aim of this verb is to make available the next logical record from the input file. It is important to note the meaning of the "next" logical record in the
PERFORM STATEMENT: The PERFORM statement can be used to execute the group of consecutive statements written elsewhere in the program. We refer to this group of statements a
Example of read statement: Illustration: READ OLD-MASTER AT END MOVE ZERO TO END-OF-RECORDS. As a result of this statement, generally the next record from the OLD-MAST
SIMPLE MERGE VERB: Like sorting, the merging of files is often required in different commercial application. It is likely to merge two or more files with the help of one MERGE
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