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STATEMENTS FOR SEQUENTIAL FILES:
A basic operation on a file includes the reading and writing of its records.
Whenever the file is sequential, there are three verbs for the aim. These are READ, WRITE and REWRITE.
PROGRAM USING OCCURS CLAUSE: We have to write a simple program to demonstrate Occurs Clause. Get the employee details for 3 persons and compute the total salary. identifica
PROGRAM FOR MASTER FILE MAINTENANCE: We have to write a program to keep the stu-file for which a record has just 2 fields,viz., rno(Roll Number) and name(Student Name). Give t
FILE CHARACTERISTICS: The task of file handling is the responsibility of the system software termed as IOCS (Input-Output control system). Record Size: We know that th
CLASS CONDITION: The class condition establishes whether or not the value of the operand is numeric or alphabetic. The operand is numeric if it contains only the digits 0 t
File- Section &Working-Storage Section: a) FILE SECTION: The FILE SECTION includes the explanation of all data items that must be read from or written onto some external
Common form of the READ statements: Format 1 is the common form of the READ statements. Format 2 is used when the access mode is either random or dynamic. For illustration,
SIGN CONDITION: The sign condition establishes whether or not the algebraic value of an operand is negative, positive or zero. The operand can be either the numeric identif
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
Example of Accept statement: For illustration, ACCEPT FLAG-A can be specified to read the value of the FLAG_A from the console. It may be keep in mind that no file definition
OPEN STATEMENT: Whenever a READ or a WRITE operation is executed on a file, then it should be open. The opening of a file may be completed with the help of the OPEN verb. With
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