13.1 - User Defined Data Types

Question 1

Purpose of user-defined data type

Answer 1

• To create a new data type
• To allow data types not available in the programming language

Question 2

Why are user-defined data types necessary

Answer 2

• When the programmer needs to specify a new data type to meet the requirments of an application
• When there are no suitable data types provided by the programming language

Question 3

State what is meant by user-defined

Answer 3

• Derived from one or more existing data types
• Used to extend built in data types
• Creates data type specific to application

Question 4

Define non composite data type

Answer 4

• A single data type that does not reference another data type
• Usually built into the programming language

Question 5

What is a composite data type

Answer 5

• Data type that refers to other data types
• Constructed from other data types

Question 6

What is an enumerated data type

Answer 6

• Data type used to store constant values
• A list of possible value
• Non composite, user defined

Question 7

What is a pointer data type

Answer 7

• A user defined, non composite data type
• referencing a memory location

Question 8

What is a set data type

Answer 8

• A data type to create sets and apply mathematical operations
• Contains a collection of unorganized data values

Question 9

What operations does a set support

Answer 9

• Checks if vaues exists
• Delete/Add data in a set
• Union two sets