4.1.4
2D Arrays
2D Arrays
2D Arrays
A 2D array is the data structure which consists of an array of arrays.
2D Array
2D Array
- A 2D array is a data structure where arrays are filled with other arrays.
- This can be used to represent a 2D surface, or records.
Accessing elements
Accessing elements
- To access an individual array, we can access the array as usual:
- array = my2DArray[4]
- To access an individual element, we use this syntax:
- array[5][0]
- This would get the first element of the sixth array.
Applications of 2D arrays
Applications of 2D arrays
- 2D arrays are often used to represent a 2D surface, for example a chess board:
- Each element of the 2D array could contain the chess piece in that location.
- 2D arrays can be used to represent a database:
- The outer array stores a collection of records.
- The inner arrays store a single record.
1Components of a Computer
1.1Structure & Function of the Processor
1.2Types of Processors
1.3Input, Output & Storage
1.3.1Elements of Computer Systems
1.3.2Types of Computer Systems
1.3.3How Magnetic Storage Works
1.3.4Properties of Magnetic Storage
1.3.5Examples of Magnetic Storage
1.3.6How Optical Storage Works
1.3.7Properties of Optical Storage
1.3.8Examples of Optical Storage
1.3.9Types of Optical Disc
1.3.10Random Access Memory
1.3.11Read Only Memory
1.3.12Uses of Flash Memory
1.3.13Properties of Flash Memory
1.3.14What to do When We Run Out of Memory
1.3.15How Virtual Memory Works
2Software & Software Development
2.1Systems Software
2.2Applications Generation
2.2.1Applications Software
2.2.2Utilities
2.2.3Encryption Software
2.2.4Defragmentation Software
2.2.5Data Compression Software
2.2.6Backup Software
2.2.7Open Source Software
2.2.8Proprietary Software
2.2.9Licensing Issues
2.2.10Compilers
2.2.11Interpreters
2.2.12Assemblers
2.2.13Compiling a Program
2.2.14Lexical Analysis
2.2.15Compilation Stages
2.2.16Linkers, Loaders & Libraries
2.3Software Development
2.3.1Algorithmic Thinking
2.3.2Waterfall Lifecycle
2.3.3Waterfall Lifecycle - Strengths & Weaknesses
2.3.4Agile Methodology
2.3.5Agile Methodology - Strengths & Weaknesses
2.3.6Extreme Programming
2.3.7Extreme Programming - Strengths & Weaknesses
2.3.8Spiral Methodology
2.3.9Spiral Methodology - Strengths & Weaknesses
2.3.10Rapid Application Development
2.3.11RAD - Strengths & Weaknesse
2.4Types of Programming Language
3Exchanging Data
3.1Compression, Encryption & Hashing
3.2Databases
3.3Networks
3.3.1The Benefits of Networks
3.3.2Network Performance
3.3.3Types of Networks
3.3.4Network Protocols
3.3.5Transmission Protocols
3.3.6What is the Internet?
3.3.7Uniform Resource Locators
3.3.8Domain Name Service
3.3.9Web Hosting
3.3.10Layering Concepts
3.3.11TCP &. OSI Models
3.3.12The Advantages of Layering
3.3.13What's in a Packet?
3.3.14How do Packets get Routed?
3.3.15Did my Data Arrive Safely?
3.3.16Network Hardware
3.3.17Transmission Media
3.3.18Firewalls
3.3.19Proxies
3.3.20Client-Server Model
3.3.21Advantages of the Client Server Model
3.3.22Disadvantages of the Client Server Model
3.3.23Peer-to-Peer Model
3.3.24Advantages of the Peer-to-Peer Model
3.3.25Disadvantages of the Peer-to-Peer Model
4Data Types, Data Structures & Algorithms
4.1Data Types
4.1.1Data Types
4.1.2Casting
4.1.3Arrays
4.1.42D Arrays
4.1.5Strings
4.1.6Binary
4.1.7Sign & Magnitude
4.1.8Binary Addition
4.1.9Binary Shifts
4.1.10Hexadecimal
4.1.11Using Hexadecimal
4.1.12Converting Binary & Hexadecimal
4.1.13Converting Denary & Hexadecimal
4.1.14Floating Points in Binary
4.1.15Normalisation of Floating Points
4.1.16Floating Point Addition
4.1.17Floating Point Subtraction
4.1.18Bitwise Manipulation - Shifts
4.1.19Bitwise Manipulation - Masks
4.1.20Character Sets
4.1.21ASCII
4.1.22Unicode
4.2Data Structures
5Legal, Moral, Cultural & Ethical Issues
5.1Computing Related Legislation
5.2Moral & Ethical Issues
5.2.1Online Activity Tracking
5.2.2Censorship
5.2.3Positive Cultural Impacts
5.2.4Negative Cultural Impacts
5.2.5E-Waste
5.2.6Energy Consumption
5.2.7Positive Environmental Impact
5.2.8Layout, Colour Paradigms & Character Sets
5.2.9Computers in the Workplace
5.2.10Automated Decision-Making
5.2.11Artificial Intelligence
5.2.12Monitoring Behaviour
5.2.13Analysing Personal Information
5.2.14Piracy & Offensive Communication
6Elements of Computational Thinking
6.1Thinking Abstractly
6.2Thinking Ahead
6.3Thinking Procedurally
6.4Thinking Logically
6.5Thinking Concurrently
7Problem Solving & Programming
7.1Programming Techniques
7.2Programming Construction
Jump to other topics
1Components of a Computer
1.1Structure & Function of the Processor
1.2Types of Processors
1.3Input, Output & Storage
1.3.1Elements of Computer Systems
1.3.2Types of Computer Systems
1.3.3How Magnetic Storage Works
1.3.4Properties of Magnetic Storage
1.3.5Examples of Magnetic Storage
1.3.6How Optical Storage Works
1.3.7Properties of Optical Storage
1.3.8Examples of Optical Storage
1.3.9Types of Optical Disc
1.3.10Random Access Memory
1.3.11Read Only Memory
1.3.12Uses of Flash Memory
1.3.13Properties of Flash Memory
1.3.14What to do When We Run Out of Memory
1.3.15How Virtual Memory Works
2Software & Software Development
2.1Systems Software
2.2Applications Generation
2.2.1Applications Software
2.2.2Utilities
2.2.3Encryption Software
2.2.4Defragmentation Software
2.2.5Data Compression Software
2.2.6Backup Software
2.2.7Open Source Software
2.2.8Proprietary Software
2.2.9Licensing Issues
2.2.10Compilers
2.2.11Interpreters
2.2.12Assemblers
2.2.13Compiling a Program
2.2.14Lexical Analysis
2.2.15Compilation Stages
2.2.16Linkers, Loaders & Libraries
2.3Software Development
2.3.1Algorithmic Thinking
2.3.2Waterfall Lifecycle
2.3.3Waterfall Lifecycle - Strengths & Weaknesses
2.3.4Agile Methodology
2.3.5Agile Methodology - Strengths & Weaknesses
2.3.6Extreme Programming
2.3.7Extreme Programming - Strengths & Weaknesses
2.3.8Spiral Methodology
2.3.9Spiral Methodology - Strengths & Weaknesses
2.3.10Rapid Application Development
2.3.11RAD - Strengths & Weaknesse
2.4Types of Programming Language
3Exchanging Data
3.1Compression, Encryption & Hashing
3.2Databases
3.3Networks
3.3.1The Benefits of Networks
3.3.2Network Performance
3.3.3Types of Networks
3.3.4Network Protocols
3.3.5Transmission Protocols
3.3.6What is the Internet?
3.3.7Uniform Resource Locators
3.3.8Domain Name Service
3.3.9Web Hosting
3.3.10Layering Concepts
3.3.11TCP &. OSI Models
3.3.12The Advantages of Layering
3.3.13What's in a Packet?
3.3.14How do Packets get Routed?
3.3.15Did my Data Arrive Safely?
3.3.16Network Hardware
3.3.17Transmission Media
3.3.18Firewalls
3.3.19Proxies
3.3.20Client-Server Model
3.3.21Advantages of the Client Server Model
3.3.22Disadvantages of the Client Server Model
3.3.23Peer-to-Peer Model
3.3.24Advantages of the Peer-to-Peer Model
3.3.25Disadvantages of the Peer-to-Peer Model
4Data Types, Data Structures & Algorithms
4.1Data Types
4.1.1Data Types
4.1.2Casting
4.1.3Arrays
4.1.42D Arrays
4.1.5Strings
4.1.6Binary
4.1.7Sign & Magnitude
4.1.8Binary Addition
4.1.9Binary Shifts
4.1.10Hexadecimal
4.1.11Using Hexadecimal
4.1.12Converting Binary & Hexadecimal
4.1.13Converting Denary & Hexadecimal
4.1.14Floating Points in Binary
4.1.15Normalisation of Floating Points
4.1.16Floating Point Addition
4.1.17Floating Point Subtraction
4.1.18Bitwise Manipulation - Shifts
4.1.19Bitwise Manipulation - Masks
4.1.20Character Sets
4.1.21ASCII
4.1.22Unicode
4.2Data Structures
5Legal, Moral, Cultural & Ethical Issues
5.1Computing Related Legislation
5.2Moral & Ethical Issues
5.2.1Online Activity Tracking
5.2.2Censorship
5.2.3Positive Cultural Impacts
5.2.4Negative Cultural Impacts
5.2.5E-Waste
5.2.6Energy Consumption
5.2.7Positive Environmental Impact
5.2.8Layout, Colour Paradigms & Character Sets
5.2.9Computers in the Workplace
5.2.10Automated Decision-Making
5.2.11Artificial Intelligence
5.2.12Monitoring Behaviour
5.2.13Analysing Personal Information
5.2.14Piracy & Offensive Communication
6Elements of Computational Thinking
6.1Thinking Abstractly
6.2Thinking Ahead
6.3Thinking Procedurally
6.4Thinking Logically
6.5Thinking Concurrently
7Problem Solving & Programming
7.1Programming Techniques
7.2Programming Construction
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