Which COBOL file control verb is used to establish a connection between a COBOL program and an external file?
- FILE
- OPEN
- READ
- WRITE
The OPEN verb in COBOL is used to establish a connection between a COBOL program and an external file. It prepares the file for subsequent READ or WRITE operations.
_____ is the process of creating a new object from a class in Object-Oriented COBOL.
- CREATION
- GENERATION
- INSTANTIATION
- OBJECTIFICATION
In Object-Oriented COBOL, the process of creating a new object from a class is known as "INSTANTIATION." It involves creating an instance of a class with its own set of data and behavior.
In a large COBOL application, you have multiple programs that need to share a common data structure. How can subprograms help in managing this data sharing efficiently?
- COPY statement
- Global Data Section
- Parameter Passing
- Redefine Clause
Subprograms can efficiently manage data sharing by using Parameter Passing. By passing parameters, data can be exchanged between the main program and subprograms, ensuring modularity and reducing dependencies on global data.
When using the EXTERNAL clause in COBOL, how can you ensure variable visibility across different programs?
- By declaring the variable as REDEFINES in each program
- By declaring the variable in each program using the EXTERNAL clause
- By using the ENTRY statement in the calling program
- By using the GLOBAL clause along with the EXTERNAL clause
To ensure variable visibility across different programs, you can use the GLOBAL clause along with the EXTERNAL clause. This combination allows the variable to have global visibility, making it accessible across various program units.
When working with external files, the _____ clause is used for file access control.
- ACCESS
- CONTROL
- FILE
- ORGANIZATION
In COBOL, the ACCESS clause is used for file access control when working with external files. It specifies the type of access (e.g., sequential or random) that the program will have to the file.
The _____ debugging technique in COBOL involves isolating parts of the code to identify the source of a problem.
- Incremental
- Isolation
- Modular
- Stepwise
The "Isolation" debugging technique in COBOL involves isolating specific parts of the code for focused analysis. This helps identify the source of a problem by narrowing down the scope of investigation, facilitating efficient debugging.
How can you ensure that a variable is accessible to multiple paragraphs within a procedure?
- Declare the variable with a GLOBAL clause
- Define the variable in the DATA DIVISION
- Include the variable in the PROCEDURE DIVISION header
- Use the GLOBAL paragraph to define the variable
To make a variable accessible to multiple paragraphs within a procedure in COBOL, you need to declare the variable in the DATA DIVISION. This ensures that the variable is known and can be referenced by any paragraph within the procedure.
In COBOL, when dealing with variable-length records, which data structure is used to determine the length of each record?
- Data Division
- File Section
- Record Description Table (RDT)
- Record Descriptor Entry (RDE)
In COBOL, the Record Descriptor Entry (RDE) is used to specify the length and structure of variable-length records. It contains information such as the starting position and length of each field within the record.
In Object-Oriented COBOL, _____ allows a class to provide different implementations of a method based on the specific object type.
- Abstraction
- Encapsulation
- Inheritance
- Polymorphism
Polymorphism in Object-Oriented COBOL allows a class to provide different implementations of a method based on the specific object type. It enhances flexibility by enabling a single method name to have different behaviors in different classes.
_____ is the file access mode used when you only need to read records from a file in COBOL.
- EXTEND
- I-O
- INPUT
- OUTPUT
"INPUT" is the file access mode used in COBOL when you only need to read records from a file. This mode allows the program to read data from the specified file but does not allow writing or updating records.