A Level Computer Science Programming Guide/Arrays

Declaring Arrays

In Pseudocode, Arrays all have declarable Upper and Lower bounds.

In VB.NET, Arrays all have declarable Upper Bounds, but Lower Bounds are always 0.

One Dimensional Arrays

Language

General Usage

Example Usage

Pseudocode

DECLARE <Identifier> : ARRAY[<Lower Bound>:<Upper Bound>] OF <Data Type>

DECLARE NameList : ARRAY[1:5] OF STRING
DECLARE YearlyRainfall : ARRAY[1900:2100] OF REAL
DECLARE AgeList : ARRAY[0:40] OF INTEGER

VB.NET

Dim <Identifier>(<Upper Bound>) As <Data Type>

Dim NameList(4) As String
Dim YearlyRainfall(200) As Double
Dim AgeList(40) As Integer

Python

<Identifier> = []

NameList = []
YearlyRainfall = []
AgeList = []

Two Dimensional Arrays

Language

General Usage

Example Usage

Pseudocode

DECLARE <Identifier> : ARRAY[<Lower Bound>:<Upper Bound>, <Lower Bound>:<Upper Bound>] OF <Data Type>

DECLARE GameArea : ARRAY[1:32, 0:16] OF STRING
DECLARE SudokuGrid : ARRAY[1:9, 1:9] OF INTEGER
DECLARE PopulationDensity : ARRAY[1:50, 20:50] OF REAL

VB.NET

Dim <Identifier>(<Upper Bound>, <Upper Bound>) As <Data Type>

Dim GameArea(31, 16) As String
Dim SudokuGrid(8) As Integer
Dim PopulationDensity(49,30) As Double

Python

<Identifier1> = []
<Identifier2> = []
<Identifier1>.append(<Identifier2>)

Game = []
GameArea = []
GameArea.append(Game)

SudokuX = []
SudokuGrid = []
SudokuGrid.append(SudokuX)

Longitude = []
PopulationDensity = []
PopulationDensity.append(Longitude)

Using Arrays

One Dimensional Arrays

Language

General Usage

Example Usage

Pseudocode

<Identifier>[<Index>] ← <Value>

NameList[1] ← "Stephen"
YearlyRainfall[1985] ← 13.73
AgeList[39] ← 17

VB.NET

<Identifier>(<Index>) = <Value>

NameList(0) = "Stephen"
YearlyRainfall(85) = 13.73
AgeList(38) = 17

Python

<Identifier>.append(<Value>)

NameList.append("Stephen")
YearlyRainfall.append(13.73)
AgeList.append(17)

Two Dimensional Arrays

Language

General Usage

Example Usage

Pseudocode

<Identifier>[<Index>,<Index>] ← <Value>

GameArea[16, 5] ← "Fire"
SudokuGrid[9, 3] ← 7
PopulationDensity[14, 32] ← 242.023

VB.NET

<Identifier>(<Index>,<Index>) = <Value>

GameArea(15, 5) = "Fire"
SudokuGrid(8, 2) = 7
PopulationDensity(13, 12) = 242.023

Python

<Identifier1> = []
<Identifier2> = []
<Identifier1>.append(<Identifier2>)

Game.append("Fire")
GameArea.append(Game)

SudokoX.append(7)
SudokuGrid.append(SudokuX)

Longitude.append(242.023)
PopulationDensity.append(Longitude)