A Level 13.1 - 13.3

Why are user-defined types necessary in programming?

• They provide a way to directly modify built-in types.

• They allow programmers to create complex data structures that match specific requirements.

• They reduce the performance of programs.

• They limit the number of variables you can create.

Which of the following is an example of a non-composite user-defined data type?

• Array

• Record

• Enumeration

• LinkedList

What is a composite data type?

• A data type that consists of simple values only.

• A data type that is built using other data types, allowing more complex structures.

• A data type used exclusively for numeric operations.

• A data type used to store text data only.

Which of the following would be the most appropriate user-defined type to represent a 'Book' in a library system?

• String

• Boolean

• Record (Title, Author, Year Published, ISBN)

• Integer

Which of the following is NOT a method of file organisation?

• Sequential

• Indexed

• Hashing

• Binary

What method of file access is used when searching for records in a sequential file?

• Direct access

• Random access

• Sequential access

• Indexed access

Which method of file organisation is most appropriate for efficiently storing and retrieving data with large datasets using a unique key?

• Sequential access

• Hashing

• Random access

• Linked list

What is the primary purpose of a hashing algorithm in file organisation?

• To sort records in alphabetical order.

• To reduce the size of the file.

• To map data to a unique location for faster retrieval.

• To encrypt sensitive data in the file.

In a floating-point number, which part of the representation contains the exponent?

• Mantissa

• Denominator

• Sign bit

• Exponent field

Convert the binary floating-point number 1.101 × 2^3 into its denary equivalent.

• 10.5

• 13.25

• 11.5

• 14.75