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Label Records / Disk Directory:
The most important information stored in the header label is what is termed as the file title. In the situation of magnetic-disk files the labels normally do not exist (there are lots of exceptions). As, more than one file is stored on a disk pack, the Input-Output control system also maintains a disk directory for all the files.
INPUT AND OUTPUT PROCEDURE IN SORT STATEMENT: The common format of the SORT statement can write as shown below: The format of the RELEASE statement is as shown be
REWRITE STATEMENT: As in the situation of a relative file, the REWRITE statement needs that the file should be opened in the I-O mode, and if the SEQENTIAL access mode is spec
Example of File-control: The assign clause assigns a specific physical peripheral device name to a file. The physical peripheral device are machine-dependent. We use the devic
Environment Division: The Environment Division is the second division in the COBOL source program. It is mainly machine-dependent . The computer and all the peripheral dev
Record Description for the Variable-length Records: When the variable- length records consists of records of various lengths, each record type is to be explained at level 01 f
Program for Sequential File Creation & Rewriting We have to write a program to create a Length file with just two fields: l (Length) and l-c (Length-Code). Add a few records.
GIVING file-name-5. The input files to be merged through the MERGE statements which are specified in the USING phrase. These files should be sequential files and should be
CR and DB (Credit and Debit Sign): The two characters that is CR or DB symbol may appear only at the rightmost place of the picture. They are similar to the minus sign edit ch
UPDATING OF THE RELATIVE AND INDEXED FILES: The Sequential files are updated by creating a new master file from an existing old master file and a transaction file. Such an Upda
GO TO, STOP RUN: The GO TO verb is used to completely transfer the control to elsewhere in the program. Its form is as shown below: GO TO procedure-name As a result o
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