Pseudocode is your stepping stone to proper programming - it's...
Computer Science498 views·Updated 5 Sept 2026·6 pagesLearn Effective Pseudocode Writing
1 / 6
1
of 6
Variables and Data Types
Getting comfortable with variables is absolutely crucial - they're basically containers that store information your program needs to remember. You create them using the equals sign, like name = "Bob", and it's that simple.
Here's something important to remember: variables created inside a function stay local to that function (they can't be used elsewhere). However, if you want to make a variable from your main program local to a specific function, just use the local keyword, or make it available everywhere with global.
Casting lets you convert between different data types, which you'll use constantly. The functions str(), int(), and float() are your best mates here - str(3) gives you "3", whilst int("3") gives you the number 3.
Quick Tip: Think of casting like translation - you're converting data from one "language" (type) to another so different parts of your program can understand it.
2
of 6
Input, Output and Loops
The print command is your window to the world - it displays whatever you want on screen. You can print text directly with print("hello") or show what's stored in a variable by printing the variable itself.
Count controlled iteration (for loops) runs a specific number of times. The example for i=0 to 7 actually runs 8 times because it includes both 0 and 7 - this catches loads of students out in exams!
Condition controlled iteration keeps going until something changes. While loops check the condition first, then run the code. Do-until loops run the code first, then check - this guarantees the code runs at least once, which is sometimes exactly what you need.
Remember: Count when you know how many times, condition when you're waiting for something to happen!
3
of 6
Decision Making and Text Handling
If-else statements are like having a conversation with your program - you're giving it different responses based on what the user does. The structure flows from if to elseif (for additional conditions) to else (the catch-all backup).
Switch-case statements do the same job but look much cleaner when you've got loads of options to check. They're brilliant for menu systems where users might choose A, B, C, or something completely random.
String handling gives you superpowers with text. Use .length to find out how long a string is, and .substring() to grab specific chunks of text. The substring method needs two numbers: where to start and how many characters to take.
Pro Tip: Switch statements are your friend for multiple choices - they're much easier to read than endless if-elseif chains!
4
of 6
Subroutines and Arrays
Functions and procedures are like having helpful assistants in your code. Functions do a job and give you something back (using return), whilst procedures just do a job without returning anything. Think of functions as questions that need answers, procedures as commands that just get done.
Arrays are incredibly useful for storing lists of related data. They start counting from 0 (not 1!), so your first item is always at position 0. Declare them with the array keyword and a size, then fill them up with your data.
File handling lets your programs remember things between runs. Use openRead() to get information from files and readLine() to grab it line by line. Don't forget to close() your files when you're finished - it's like putting the lid back on a jar.
Key Point: Always remember arrays start at 0 - this trips up even experienced programmers sometimes!
5
of 6
File Operations and OOP Basics
Writing to files works similarly to reading, but you use openWrite() and writeLine() instead. This is brilliant for saving user data, high scores, or any information your program needs to remember for next time.
Object-oriented programming introduces methods (what objects can do) and attributes (what objects know about themselves). Everything is public (accessible everywhere) unless you specifically make it private with the private keyword.
Constructors are special procedures called new that set up your objects when they're first created. They're like the instruction manual that gets your object ready to use - setting initial values and getting everything organised.
Remember: Think of private attributes like your diary - only you (the object) should be able to read and change them directly!
6
of 6
Classes and Inheritance
Classes are like blueprints for creating objects. The Pet class example shows how you define what all pets should have (a name) and what they can do (be created with a given name through the constructor).
Inheritance is absolutely brilliant - it lets you create new classes based on existing ones without starting from scratch. The Dog class inherits everything from Pet, then adds its own special features (like breed).
The super.new() call is clever - it runs the parent class's constructor first, then adds the new stuff. This means Dog objects get both a name (from Pet) and a breed (from Dog) without duplicating code.
Think of it this way: If Pet is like a general animal template, Dog is a more specific version that keeps all the pet features but adds dog-specific ones!
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Computer Science498 views·Updated 5 Sept 2026·6 pagesLearn Effective Pseudocode Writing
Pseudocode is your stepping stone to proper programming - it's like writing instructions in plain English before converting them into actual code. These notes cover all the essential building blocks you'll need for your programming coursework, from basic variables to...
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Variables and Data Types
Getting comfortable with variables is absolutely crucial - they're basically containers that store information your program needs to remember. You create them using the equals sign, like name = "Bob", and it's that simple.
Here's something important to remember: variables created inside a function stay local to that function (they can't be used elsewhere). However, if you want to make a variable from your main program local to a specific function, just use the local keyword, or make it available everywhere with global.
Casting lets you convert between different data types, which you'll use constantly. The functions str(), int(), and float() are your best mates here - str(3) gives you "3", whilst int("3") gives you the number 3.
Quick Tip: Think of casting like translation - you're converting data from one "language" (type) to another so different parts of your program can understand it.
2
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Input, Output and Loops
The print command is your window to the world - it displays whatever you want on screen. You can print text directly with print("hello") or show what's stored in a variable by printing the variable itself.
Count controlled iteration (for loops) runs a specific number of times. The example for i=0 to 7 actually runs 8 times because it includes both 0 and 7 - this catches loads of students out in exams!
Condition controlled iteration keeps going until something changes. While loops check the condition first, then run the code. Do-until loops run the code first, then check - this guarantees the code runs at least once, which is sometimes exactly what you need.
Remember: Count when you know how many times, condition when you're waiting for something to happen!
3
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Decision Making and Text Handling
If-else statements are like having a conversation with your program - you're giving it different responses based on what the user does. The structure flows from if to elseif (for additional conditions) to else (the catch-all backup).
Switch-case statements do the same job but look much cleaner when you've got loads of options to check. They're brilliant for menu systems where users might choose A, B, C, or something completely random.
String handling gives you superpowers with text. Use .length to find out how long a string is, and .substring() to grab specific chunks of text. The substring method needs two numbers: where to start and how many characters to take.
Pro Tip: Switch statements are your friend for multiple choices - they're much easier to read than endless if-elseif chains!
4
of 6Sign up to see the content. It's free!
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By signing up you accept Terms of Service and Privacy Policy
Subroutines and Arrays
Functions and procedures are like having helpful assistants in your code. Functions do a job and give you something back (using return), whilst procedures just do a job without returning anything. Think of functions as questions that need answers, procedures as commands that just get done.
Arrays are incredibly useful for storing lists of related data. They start counting from 0 (not 1!), so your first item is always at position 0. Declare them with the array keyword and a size, then fill them up with your data.
File handling lets your programs remember things between runs. Use openRead() to get information from files and readLine() to grab it line by line. Don't forget to close() your files when you're finished - it's like putting the lid back on a jar.
Key Point: Always remember arrays start at 0 - this trips up even experienced programmers sometimes!
5
of 6Sign up to see the content. It's free!
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File Operations and OOP Basics
Writing to files works similarly to reading, but you use openWrite() and writeLine() instead. This is brilliant for saving user data, high scores, or any information your program needs to remember for next time.
Object-oriented programming introduces methods (what objects can do) and attributes (what objects know about themselves). Everything is public (accessible everywhere) unless you specifically make it private with the private keyword.
Constructors are special procedures called new that set up your objects when they're first created. They're like the instruction manual that gets your object ready to use - setting initial values and getting everything organised.
Remember: Think of private attributes like your diary - only you (the object) should be able to read and change them directly!
6
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- Access to all documents
- Improve your grades
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By signing up you accept Terms of Service and Privacy Policy
Classes and Inheritance
Classes are like blueprints for creating objects. The Pet class example shows how you define what all pets should have (a name) and what they can do (be created with a given name through the constructor).
Inheritance is absolutely brilliant - it lets you create new classes based on existing ones without starting from scratch. The Dog class inherits everything from Pet, then adds its own special features (like breed).
The super.new() call is clever - it runs the parent class's constructor first, then adds the new stuff. This means Dog objects get both a name (from Pet) and a breed (from Dog) without duplicating code.
Think of it this way: If Pet is like a general animal template, Dog is a more specific version that keeps all the pet features but adds dog-specific ones!
We thought you’d never ask...
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
You can download the app from Google Play Store and Apple App Store.
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Students love us, and so will you.
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