How is data storage allocated for a COBOL array defined using the OCCURS clause?
- Allocation based on the DEPENDING ON clause
- Allocation determined by the INDEXED BY phrase
- Contiguous memory allocation for all occurrences
- Separate memory allocation for each occurrence
Data storage for a COBOL array defined using the OCCURS clause is allocated contiguously in memory for all occurrences. This ensures that the array elements are stored in a sequential block, allowing for efficient access and manipulation of array data.
In COBOL, _______ locks allow multiple users to read a file simultaneously, but only one user can write to it.
- Exclusive
- Read-only
- Shared
- Update
In COBOL, Exclusive locks allow multiple users to read a file simultaneously, but only one user can write to it. This ensures data integrity by preventing concurrent writes that could lead to inconsistencies. Shared locks, on the other hand, allow multiple users to read the file simultaneously without preventing each other.
What is the purpose of the INSPECT statement in COBOL?
- It allocates storage for a group of data items
- It controls the flow of the program
- It is used for arithmetic operations on numeric data
- It is used for searching and replacing specified characters in a string
The INSPECT statement in COBOL is employed for searching and replacing specified characters within a string. It provides a powerful mechanism for manipulating character data, facilitating tasks such as data cleaning and transformation.
A subprogram can have its own _____ section for local data.
- FILE
- LINKAGE
- LOCAL-STORAGE
- WORKING-STORAGE
A subprogram in COBOL can have its own LOCAL-STORAGE section for declaring local data items. These items are private to the subprogram and retain their values between successive calls to the subprogram.
How are COBOL structures different from simple data items?
- COBOL structures are always stored in binary format, while simple data items are stored in ASCII format
- COBOL structures are not supported in modern programming
- COBOL structures are used only for numeric data, while simple data items are used for alphanumeric data
- COBOL structures group related data items, while simple data items represent individual elements
COBOL structures differ from simple data items as they are used to group related data items together, providing a way to represent complex entities. Simple data items, on the other hand, represent individual elements without grouping.
What is the purpose of the "RESUME" statement in error recovery strategies?
- Allows the program to continue execution after handling an exception
- Reverts the program to its initial state
- Rolls back changes made to files
- Terminates the program to prevent further errors
The "RESUME" statement in COBOL is used to allow the program to continue execution after handling an exception. It helps in implementing controlled error recovery strategies, ensuring that the program can gracefully recover from errors and continue processing.
When using the MERGE statement in COBOL, what condition must be met for the input files?
- They must be in the same data division
- They must be individually sorted in ascending order
- They must contain numeric data only
- They must have the same record length
In COBOL, when using the MERGE statement, the input files must be individually sorted in ascending order based on the key fields specified in the MERGE statement. This ensures a successful merging process.
When dealing with indexed files in COBOL, what is the role of the index file?
- It compresses the data to save storage space
- It contains pointers to the actual records in the data file
- It organizes records in a sequential order
- It stores backup copies of the data file
The index file in COBOL's indexed file organization contains pointers to the actual records in the data file. This allows for efficient random access to records based on the indexed key.
In a COBOL program for processing employee data, you need to store the employee's unique identification number. Which type of COBOL variable would you use for this purpose?
- PIC 9(5) DISPLAY
- PIC 9(6) USAGE COMP-3
- PIC S9(9)
- PIC X(10)
For storing unique identification numbers in COBOL, PIC S9(9) is appropriate. It allows for numeric values with sign, suitable for representing employee IDs.
Which debugging technique involves adding temporary output statements to your COBOL code to track the program's flow and variable values?
- Backtracking
- Code inspection
- Interactive debugging
- Print debugging
Print debugging is a debugging technique where temporary output statements are added to the COBOL code to print variable values and messages during program execution. This helps in understanding the program's flow and identifying issues.