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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 addition, some of the index tables are also created and maintained with the file.
An indexed file on COBOL can be accessed either sequential or randomly. Though, while creating an indexed file the records can be written only sequentially and in the ascending order of the key. Whenever an indexed file is accessed randomly, the series in which the records are accessed is controlled by the programmer by specifying the value of the data item known as record key.
The Indexed files in a COBOL program can be handled through appropriate special codes in the FILE-CONTROL paragraph and in the PROCEDURE DIVISION.
PROGRAMS FOR REDEFINES CLAUSE: We have to write a simple program to explain the REDEFINES clause at 01 level. identification division. program- id. Redef. environment
PROGRAM FOR INDEXED SEQUENTIAL FILE CREATION (RANDOM MODE): We have to write a program to create an Indexed Sequential File in random mode for Student particulars. Suppose jus
PROGRAM TO DEMONSTRATE MERGE VERB: The two files for which a record having 2 fields viz. Account Number and Name are already available. Now Merge these two files and create a
SPECIAL-NAMES: This paragraph is used to associate some hardware names to the user-specified mnemonic names. This paragraph is elective in all compilers. The format of this pa
Comparison of Numeric Operands: We are well-known with the kind of the relational condition where both the operands are numeric. The comparison in this situation is algebraic
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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 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
Illustration of Multiply verb: (a) MULTIPLY A BY B. In this situation the value of A & B will be multiplied and the product will be stored in B. The decimal point locatio
simplify smple interest
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