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This resource is designed as a quick reference or revision guide. It has not been endorsed by any exam boards. If you spot any mistakes, please let me know and I'll fix them asap.

This website aims to give a quick reference for VB.NET, Python, C# and pseudocode and is aimed primarily at teachers & students working towards a GCSE in Computer Science

**VB.NET**, **Python** and **C#** are programming languages designed to be understood and followed by computers. **Pseudocode** is not a programming language: it's written to be understood by humans so that they can turn it into any programming language.

Each exam board has published a document saying how they'll write pseudocode in their exams. The whole idea of **syntax** (a set of rules) for pseudocode is silly - it's not designed to be a programming language that is run by a computer. With this in mind, all exam boards state that you **don't** have to follow the syntax for 'their' version of pseudocode when you **write** out your own algorithms, but you **should** be able to understand their version of pseudocode when **reading** an algorithm in an exam.

- Explore the different categories of skills at the top of this page
Each skill has example code in VB.NET, Python, C# and Pseudocode for Edexcel, Eduqas and OCR GCSE.

- Search for a specific skill
If you know what you're looking for, use the search bar above the categories list.

A **list** is similar to an **array**: both allow more than one piece of data to be stored in the same variable.

It's not possible to add or remove data to an **array** after it's been set for the first time but it is possible to add or remove data to a **list**.

*This example creates a list called numbers and adds three integer numbers into it before displaying the sum of all the numbers added together.*

SET numbers to [1, 2, 3]
SEND SUM(numbers) TO DISPLAY

Dim numbers As New List(Of Integer)
numbers.AddRange({1, 2, 3})
MsgBox(numbers.Sum())
' You could also do:
Dim numbers As New List(Of Integer)
numbers.Add(1)
numbers.Add(2)
numbers.Add(3)
MsgBox(numbers(0) + numbers(1) + numbers(2))

numbers = []
numbers.append(1)
numbers.append(2)
numbers.append(3)
print(sum(numbers))

array numbers[3]
numbers[0] = 1
numbers[1] = 2
numbers[2] = 3
print(numbers[0] + numbers[1] + numbers[2])

numbers[3]
set numbers[0] = 1
set numbers[1] = 2
set numbers[2] = 3
output numbers[0] + numbers[1] + numbers[2]

// using System.Collections.Generic;
// using System.Linq;
List<int> numbers = new List<int>();
numbers.Add(1);
numbers.Add(2);
numbers.Add(3);
// Sum requires System.Linq
Console.WriteLine(numbers.Sum());

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