You are developing a COBOL program to read data from a file sequentially. Which file control verb should you use to open the file?
- CLOSE
- OPEN
- READ
- WRITE
In COBOL, the OPEN verb is used to open a file before reading from or writing to it in a program. This verb establishes the connection between the COBOL program and the external file, allowing subsequent READ or WRITE operations.
In a COBOL program, what file organization is typically used for master files in a database system?
- Dynamic
- Indexed
- Relative
- Sequential
Indexed file organization is typically used for master files in a database system in COBOL. It allows for efficient random access based on a key field, making it suitable for scenarios where records need to be retrieved directly by their key values.
The "I-O" file access mode allows both _____ and _____ operations on a file in COBOL.
- Appending, Renaming
- Closing, Opening
- Reading, Writing
- Updating, Deleting
The "I-O" (Input-Output) file access mode in COBOL allows both reading and writing operations on a file. It enables a program to perform a combination of input and output operations on the same file.
What is the significance of the RECORD KEY clause when defining VSAM and ISAM files in COBOL?
- It defines the length of each record in the file
- It identifies the field used as a key to uniquely identify records in the file
- It indicates the position of the record within the file
- It specifies the physical location of the file on the disk
The RECORD KEY clause in COBOL is significant when defining VSAM and ISAM files as it identifies the field used as a key to uniquely identify records in the file. This key is essential for direct access to specific records.
You are developing a COBOL application that requires modeling real-world entities and their relationships. Which Object-Oriented COBOL concept would you use to achieve this?
- Abstract Data Types
- Encapsulation
- Inheritance
- Polymorphism
In Object-Oriented COBOL, Inheritance is used to model real-world entities and their relationships. It allows a class to inherit attributes and behaviors from another class, promoting code reusability and representing an "is-a" relationship.
When defining an array or table in COBOL, you must specify the _____ of elements it can hold.
- INDEX
- OCCURS
- RANGE
- SIZE
When defining an array or table in COBOL, the OCCURS clause is used to specify the number of elements it can hold. It determines the size or occurrence of the table, indicating how many times a data item should repeat.
When performing division in COBOL, which operator should you use?
- *
- +
- -
- /
The forward slash (/) operator is used for division in COBOL. For instance, "DIVIDE operand1 BY operand2 GIVING result." is a division operation in COBOL.
How is encapsulation achieved in Object-Oriented COBOL?
- By bundling data and methods within a class
- By separating data and procedures
- Through external subroutine calls
- Through the use of global variables
Encapsulation in Object-Oriented COBOL is achieved by bundling data and methods within a class. This means that the internal details of the class, such as data structures and implementation details, are hidden from the outside world, promoting information hiding and reducing complexity.
The LEVEL NUMBER in COBOL indicates the ________ of the data item.
- Address
- Hierarchy
- Size
- Type
The LEVEL NUMBER in COBOL indicates the hierarchical level of the data item. It specifies the position of the data item within the data hierarchy, helping in organizing and structuring data.
_____ in Object-Oriented COBOL is a way to define a contract that a class must adhere to, specifying the methods it must implement.
- Encapsulation
- Inheritance
- Interface
- Polymorphism
Interface in Object-Oriented COBOL is a way to define a contract that a class must adhere to, specifying the methods it must implement. It establishes a set of method signatures that must be implemented by any class that implements the interface.