Data Structures unit 2

Question 1

What is a data structure?

Answer 1

An organised collection of related elements used to store and manage data.

Question 2

What is a one-dimensional array?

Answer 2

A list of elements, each with a unique index starting from 0.

Question 3

Give an example of a one-dimensional array.

Answer 3

marks = [75, 80, 92, 66]

Question 4

What is a two-dimensional array?

Answer 4

A matrix (grid) with rows and columns where each element is accessed using two indices.

Question 5

Give an example of a two-dimensional array.

Answer 5

timetable = [
[“Math”, “English”],
[“Science”, “History”]
]

Question 6

What data type do all elements in an array share?

Answer 6

The same data type (e.g., all integers or all strings).

Question 7

What is a record in programming?

Answer 7

A collection of fields, where each field can store a value of a different data type.

Question 8

Give an example of a record.

Answer 8

student = {
“name”: “Alice”,
“age”: 15,
“grade”: 8.5
}

Question 9

What is the main difference between arrays and records?

Answer 9

Arrays store elements of the same type, records store different types of values in fields.

Question 10

What does designing a record structure involve?

Answer 10

Deciding what fields are needed and what data type each one should store.