13.1 User-defined Data Types Cambridge iA 9618

Why are user-defined data types necessary in programming?

• They allow programmers to create structured and meaningful representations of data.

• They replace built-in data types entirely.

• They reduce the need for variables in a program.

• They prevent the use of arrays.

Which of the following is NOT a benefit of user-defined data types?

• They make debugging impossible.

• They improve code readability and maintainability.

• They allow for data abstraction and encapsulation.

• They help organize complex data structures.

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

• Enumerated type

• Array

• Record

• Class

What is the purpose of an enumerated type?

• It defines a variable that can hold a predefined set of values.

• It allows variables to store floating-point numbers.

• It dynamically allocates memory for objects.

• It creates a class for object-oriented programming.

Which of the following is a valid enumerated type declaration in pseudocode?

• TYPE Day = (Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday)

• ENUM Day = Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday

• DECLARE Day AS ENUM(Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday)

• SET Day = Monday OR Tuesday OR Wednesday OR Thursday OR Friday OR Saturday OR Sunday

What is a pointer used for in programming?

• It stores the memory address of another variable.

• It stores multiple values of different types.

• It creates an enumerated list of values.

• It defines a user-defined function.

Which of the following statements about pointers is true?

• A pointer holds the memory address of a variable.

• A pointer is a composite data type.

• A pointer always points to a constant value.

• Pointers cannot be dereferenced.

Which of the following is a composite data type?

• Record

• Enumerated type

• Pointer

• Boolean

What is a record used for?

• To store a collection of different data types under one identifier.

• To store a single data type in a fixed-size array.

• To reference another variable’s memory address.

• To create a collection of similar values.

Which of the following is a correct definition of a record in pseudocode?

• TYPE StudentRecord DECLARE Name : STRING DECLARE Age : INTEGER DECLARE Grade : CHAR END TYPE

• RECORD StudentRecord Name : STRING Age : INTEGER Grade : CHAR END RECORD

• TYPE StudentRecord(Name STRING, Age INTEGER, Grade CHAR)

• SET StudentRecord = (Name, Age, Grade)