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FILE-CONTROL:
The FILE-CONTROL paragraph names each and every file and identifies the first medium through file control entries. The basic format of a file control entry is given below:
SELECT [OPTIONAL] file-name ASSIGN TO hardware-name.
In common, a COBOL source program uses some files. For each of these files, there should be a FILE-CONTROL entry. This entry names the file and assigns the peripheral device that holds that specific file. The file names which appear in the SELECT clauses should be exclusive and all these files should be described in DATA DIVISION. The file name must be formed according to the rules of data names.
The word OPTIONAL may be used only for the input files. Whenever the object program is executed, the optional files do not require being present on every juncture. If the optional clause is omitted for a specific file, the file should be present during the execution of the program. If the file is missing or absent, an execution error will occur. On the other hand, if an elective file is absent, any try to open the file for reading will not result in an error. But the absent file will be measured to be an empty file that means that the file does not contain any record.
Valid and Invalid Word - Cobol words: Valid Word Invalid Word & Reason emp-sal -pay ( it starts with a hyphen) TOTAL MARK (blank space em
DELETE STATEMENT: The format of the delete statement is as shown below: DELETE file-name RECORD [ ; INVALID KEY imperative-statement ] Whenever the ACCESS MOD
PROGRAM FOR RENAMES CLAUSE: identification division. program- id. environment division. data division. working-storage section. 01 emp. 02 empdet.
Identification Division: The Identification Division is the first division of each and every COBOL source program. The paragraph PROGRAM-ID is necessary in most of the mac
PROGRAM FOR IF : We have to write a program to check whether the given number is ODD or EVEN. Identification division. Program- id. Ifst. Environment division.
OCCURS CLAUSE - PROGRAM: We have to write a program to demonstrate the occurs clause. Get names of the students and show them on the screen. identification division.
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
Example of Write statement: Illustration: (i) WRITE TRANS-RECORD AFTER ADVANCING 3 LINES. This WRITE statement specified that the TRANS-RECORD is a record name of a fi
REWRITE statement: The REWRITE statement is used to update the existing record in a disk file. The normal format is as shown below: REWRIE record-name [ FROM ide
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
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