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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.
PERFORM WITH TIMES OPTION: The format of a PERFORM TIMES statement is as shown below: Illustration: A) Perform the para-2 5 times. In this situation the specifie
PROGRAM FOR SCREEN SECTION: identification division. program- id. environment division. data division. working-storage section. 01 a pic 9(2) value
ACCEPT STATEMENT: The ACCEPT statement is used to read the low-volume data from the operator's console, several other hardware device or from the operating system. The common
CONDITION - COBOL Programming: The condition is an entity which at one point of time can have only one of the two values - true or false. As we already know that, the IF verb
single program how may when statement has used
Can we declare a redefine clause as below? A Redefines B, PIC X(4)
PROGRAM FOR SIMPLE PERFORM: We have to write a program to elaborate simple PERFORM statement Identification division. Program- id. Perf1. Environment division. Da
NONSTANDARD CLAUSES: The various clauses explained above are as per the ANSI standard. Also, most compilers provide for additional nonstandard clauses to meet the specific nec
RULES FOR OCCURS CLAUSE: The rules apply for the OCCURS clause and the subscripts are as shown below. (1) The integer in the OCCURS clause should be a positive integer.
Group Item as Operand in the Relational Condition: Whenever an operand of a relational condition is the group item, the item is then considered to be an alphanumeric field. Th
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