Arrays (Cambridge (CIE) O Level Computer Science)

Create

DECLARE scores: ARRAY[0:4]OF INTEGER

scores = []

Creates a blank array with 5 elements (0-4)

Creates a blank array

scores ← [12, 10, 5, 2, 8]

scores = [12, 10, 5, 2, 8]

Creates an array called scores with values assigned

Assignment

colours[4] ← "Red"

colours[4] = "Red"

 Assigns the colour "Red" to index 4 (5th element)

# Creating a one-dimensional array
array = [1, 2, 3, 4, 5]

# Accessing elements of the array
print(array[0])   # Output: 1
print(array[2])   # Output: 3

# Modifying elements of the array
array[1] = 10
print(array)      # Output: [1, 10, 3, 4, 5]

# Iterating over the array
for element in array:
    print(element)

# Output:
# 1
# 10
# 3
# 4
# 5

# Length of the array
length = len(array)
print(length)     # Output: 5

Create

DECLARE NamesAndNumbers : ARRAY[1:3, 1:3] OF STRING

NamesAndNumbers = [],[]

Creates a blank 2D array with 3 elements (0-2)

Creates a blank 2D array

NamesAndNumbers[1, 2] ← "John"

NamesAndNumbers[1, 3] ← "Emily"

NamesAndNumbers[2, 1] ← "25"

NamesAndNumbers[2, 2] ← "33"

NamesAndNumbers[2, 3] ← "19"

NamesAndNumbers[3, 1] ← "Sarah"

NamesAndNumbers[3, 2] ← "12"

NamesAndNumbers[3, 3] ← "8" 

NamesAndNumbers = ["Rob","Paul","Hayley"],[10, 5, 8] 

Creates a 2D array called players with values assigned

Assignment

NamesAndNumbers[0,1] ← "Holly"

NamesAndNumbers[0][1] = "Holly"

 Assigns the name "Holly" to index 0, 1 (1st row, 2nd column) - replaces "Paul"

# Initialising a 2D array with 3 rows and 3 columns, with the specified values
array_2d = [[1, 2, 3],
            [4, 5, 6],
            [7, 8, 9]]

# Accessing elements in the 2D array
print(array_2d[0][0])  # Output: 1
print(array_2d[1][2])  # Output: 6

# Nested iteration to access items in the 2D array

for row in array_2d:

for item in row:

print(item, end=" ")

print() # Print a newline after each row