When might you choose to use a PERFORM UNTIL loop instead of a PERFORM VARYING loop?
- When the loop condition is based on a fixed number of iterations
- When the loop condition is based on a logical condition at the end of the loop
- When the loop condition is based on a specific range of values
- When the loop condition is not predetermined
A PERFORM UNTIL loop in COBOL is used when the loop condition is based on a logical condition at the end of the loop. It ensures that the loop continues until a specified condition is met, providing flexibility in defining the termination criteria.
When working with indexed files in COBOL, the _______ clause is used to specify the maximum number of alternate indexes.
- ALTINDEXMAX
- ALTMAXINDEX
- INDEXMAX
- MAXINDEX
The INDEXMAX clause in COBOL is used to specify the maximum number of alternate indexes associated with a particular file. This defines the limit on the number of alternate indexes that can be defined for efficient file access.
To identify duplicate records in a COBOL file, you can use the _____ clause in the file description.
- DUPLICATES
- OCCURS
- REPEATED
- UNIQUE
The DUPLICATES clause in the file description of a COBOL program is used to identify and handle duplicate records within the file. It allows the programmer to specify the criteria for identifying duplicates based on one or more fields.
In VSAM files, what is the role of the Alternate Index (AIX)?
- Acts as a backup index for the primary index
- Facilitates sequential access only
- Organizes records in reverse order
- Provides an alternate path to the data records based on a key field
The Alternate Index (AIX) in VSAM files serves as an alternate path to access data records based on a key field other than the primary key. It allows for efficient retrieval and random access to records using a secondary key.
In a COBOL program for managing employee records, you need to represent each employee's details, including name, ID, and salary. Which type of COBOL data item would be most appropriate for this purpose?
- GROUP
- JUSTIFIED
- OCCURS
- REDEFINES
The GROUP data item in COBOL is suitable for representing a collection of related data fields. In the context of managing employee records, you can use GROUP to organize details such as name, ID, and salary under a single structure, making it convenient to manage and access employee information.
In COBOL, what is a user-defined function, and how is it implemented in the Procedure Division?
- A user-defined function is a custom subroutine written by the programmer to perform specific tasks. It is implemented using the FUNCTION verb in the Procedure Division
- A user-defined function is a data type in COBOL
- A user-defined function is a reserved function provided by COBOL
- COBOL does not support user-defined functions
In COBOL, a user-defined function is a custom subroutine created by the programmer to perform specific tasks. It is implemented using the FUNCTION verb in the Procedure Division, allowing developers to extend the language's functionality.
In a COBOL application, you need to process a large transaction log file sequentially. Which file organization would be most appropriate for this scenario?
- Indexed
- Line Sequential
- Relative
- Sequential
For processing files sequentially, the Sequential file organization is the most appropriate in COBOL. It allows reading records in the order they appear in the file, which is efficient for large transaction log files.
In a COBOL program that handles sales transactions, you need to store the daily sales figures for each product. How would you use the OCCURS clause to accomplish this efficiently?
- Depending On
- Grouping
- Indexing
- Non-indexed
Using the OCCURS clause with indexing is most efficient for storing daily sales figures for each product. It allows direct access to specific elements based on an index, facilitating quick retrieval of sales data for a particular product.
What is the purpose of the ACCESS MODE clause when defining an indexed file in COBOL?
- DYNAMIC and RANDOM
- RANDOM and SEQUENTIAL
- SEQUENTIAL and DYNAMIC
- SEQUENTIAL only
The ACCESS MODE clause in COBOL specifies how the file will be accessed. RANDOM allows both direct and sequential access, while SEQUENTIAL allows only sequential access. Combining them provides flexibility in file access methods.
In a COBOL program, you need to store data related to multiple sales transactions, each having various attributes. How would you define a suitable data structure for this scenario?
- Defining individual variables for each attribute of a sales transaction
- Employing nested records to capture various attributes within each sales transaction
- Using an array or table structure with OCCURS clause to represent multiple sales transactions
- Utilizing REDEFINES clause to optimize storage for sales transaction data
Using an array or table structure with the OCCURS clause is suitable for handling multiple sales transactions, providing a systematic way to organize and process the data.