Random Number Generation

Test yourself

Random Number Generation

It is often useful to generate random numbers in Greenfoot programs.

Random number generation

Random numbers can be generated using a method of the Greenfoot class:
- Greenfoot.getRandomNumber(MIN, MAX);
- This line will generate a random number between MIN and MAX.

Random number generation

There is also an alternative way to use this method:
- Greenfoot.getRandomNumber(MAX);
- This line will generate a number up to but not including MAX.

Uses of random number generation

Random number generators are used for many reasons:
- Decisions in games e.g. dice throws and coin flips.
- Simulations of systems with chance.
- Cryptography.

1Computer Systems

1.1Systems Architecture

1.1.1Elements of Computer Systems

1.1.2Types of Computer Systems

1.1.3Von Neumann Architecture

1.1.4Registers of the Central Processing Unit (CPU)

1.1.5Fetch-Execute Cycle

1.1.6Factors Affecting CPU Performance

1.1.7Exam-Style Questions - Von Neumann Architecture

1.1.8Diagnostic Misconceptions - Embedded vs General

1.2Memory & Storage

1.2.1Types of Memory

1.2.2Flash Memory

1.2.3Properties of Flash Memory

1.2.4Running Out of Memory

1.2.5Virtual Memory

1.2.6Exam-Style Questions - Primary Memory

1.2.7Units of Capacity

1.2.8Calculating Capacity Requirements

1.2.9Solid State Storage

1.2.10Properties of Solid State Media

1.2.11Magnetic Storage

1.2.12Properties of Magnetic Media

1.2.13Examples of Magnetic Storage

1.2.14Optical Storage

1.2.15Properties of Optical Media

1.2.16Examples of Optical Storage

1.2.17Types of Optical Disk

1.2.18End of Topic Test - Computer Systems

1.2.19Grade 9 - Storage

1.2.20Exam-Style Questions - Storage

1.2.21Number Bases

1.2.22Converting Number Bases

1.2.23Converting Denary & Hexadecimal

1.2.24Hexadecimal

1.2.25Using Hexadecimal

1.2.26Binary Addition

1.2.27Binary Shifts

1.2.28Representing Text

1.2.29ASCII & Unicode

1.2.30Representing Images

1.2.31Converting Binary & Images

1.2.32Representing Sound

1.2.33Data Compression

1.2.34End of Topic Test - Representation

1.2.35Exam-Style Questions - Data Conversions

1.2.36Diagnostic Misconceptions - RAM vs ROM

1.2.37Diagnostic Misconceptions - Bits, Nibbles & Bytes

1.2.38Diagnostic Misconceptions - Bits Required to Store

1.3Computer Networks, Connections & Protocols

1.4Network Security

1.4.1Forms of Attack

1.4.2Penetration Testing

1.4.3Malware

1.4.4How Malware Spreads

1.4.5Social Engineering

1.4.6Phishing

1.4.7Cracking Passwords

1.4.8Denial of Service Attacks

1.4.9Data Interception

1.4.10Methods of Data Interception

1.4.11SQL Injection

1.4.12Network Administration

1.4.13Network Forensics

1.4.14Protecting Against Malware

1.4.15Firewalls

1.4.16User Access Levels

1.4.17Passwords

1.4.18Encryption

1.4.19End of Topic Test - Networks

1.5Systems Software

1.5.1System Software

1.5.2Utility Software

1.5.3Operating Systems

1.5.4User Interfaces

1.5.5Memory & Process Management

1.5.6File Management

1.5.7Device Management

1.5.8User Management

1.5.9Encryption Software

1.5.10Defragmentation Software

1.5.11Data Compression Software

1.5.12Backup Software

1.6Ethical, Legal, Cultural & Environmental Concern

2Computational Thinking, Algorithms & Programming

2.1Algorithms

2.1.1Computational Thinking - Abstraction

2.1.2Computational Thinking - Decomposition

2.1.3Algorithmic Thinking

2.1.4Pseudocode

2.1.5Flow Diagrams

2.1.6Interpreting Algorithms

2.1.7Correcting Algorithms

2.1.8Completing Algorithms

2.1.9Search Algorithms

2.1.10Binary Search

2.1.11Linear Search

2.1.12Overview of Sort Algorithms

2.1.13Bubble Sort

2.1.14Merge Sort

2.1.15Insertion Sort

2.1.16Exam-Style Questions - Sorting Algorithms

2.2Programming Fundamentals

2.3Producing Robust Programs

2.3.1Defensive Design

2.3.2Validation & Sanitisation

2.3.3Authentication & Contingencies

2.3.4Maintainability

2.3.5Comments

2.3.6Purpose of Testing

2.3.7Types of Testing

2.3.8Test Plans

2.3.9Types of Errors

2.3.10End of Topic Test - Programming

2.3.11Exam-Style Questions - Testing

2.4Boolean Logic

2.4.1Binary Systems

2.4.2Logic Circuits

2.4.3Boolean Logic

2.4.4Boolean Operators

2.4.5Grade 9 - Logic

2.5Programming Languages & IDEs

2.5.1High-Level vs Low-Level Languages

2.5.2Translation - Compliers & Interpreter

2.5.3Translation - Assemblers

2.5.4Integrated Development Environments

2.5.5Exam-Style Questions - Translation

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