S7 - 33 Arrays, tupules and records

Question 1

what is an array?

Answer 1

A finite, ordered set of elements of the same type

Question 2

what does an array do?

Answer 2

An array holds a finite set of elements which are then assigned with an index number

Question 3

how can we reference any element in an array?

Answer 3

by entering an integer in square brackets in front of a variable.

e.g.
birdname = [“robin”, “blackbird”, “pigeon”]

birdname [2] = pigeon

Question 4

how can we return the length of an array?

Answer 4

cars = [“porsche”, “lamborghini”, “mclaren”,]

cars - this is an array and holds all these strings

the function len[cars] will assign an integer (this shows how many cars it holds)

e.g.

numcars = len[cars]
print(numcars) # it will print the integer 3 on the screen

Question 5

LOOK AT PSEUDOCODE IN PAGE 180

To find the position of a bird in an array

Answer 5

page 180

Question 6

what are the 2 arrays?

Answer 6

+ 1-dimensional array
+ 2-dimensional arrays

Question 6

how many dimensions can an array have?

Answer 6

An array can have 2 or more dimensions

Question 7

list 4 elementary data types

Answer 7

+ integer
+ real
+ boolean
+ char

Question 8

what is a tuple?

Answer 8

An ordered set of values that could be elements of any type

Question 9

whats the difference between arrays and a tupule

Answer 9

Unlike arrays, the elements do not all have to be the same time

Question 10

a tuple is immutable, what does this mean?

Answer 10

like a string the elements cannot be changed

Question 11

state the advantages and disadvantages of a tuple

Answer 11

• elements cannot be changed
• isn’t dynamic, cannot add or remove items

+ elements do not all have to be the same type