Categories: All Variables and Constants  String manipulation  Builtin functions  Input and output  Arrays  Conditional logic  Repetition / Iteration  Functions / Procedures 


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.

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Create a list of strings

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 colours and adds three strings into it before displaying the first item in the list.

SET colours TO ["Red", "Green", "Blue"] SEND colours[0] TO DISPLAY
Dim colours As New List(Of String) colours.Add("Red") colours.Add("Green") colours.Add("Blue") MsgBox(colours(0))
colours = [] colours.append("Red") colours.append("Green") colours.append("Blue") print(colours[0])
// spec doesn't mention lists: only arrays array colours[3] colours[0] = "Red" colours[1] = "Green" colours[2] = "Blue" print(colours[0])
colours[3] set colours[0] = "Red" set colours[1] = "Green" set colours[2] = "Blue" output colourd[0]
// using System.Collections.Generic; List<string> colours = new List<string>(); colours.Add("Red"); colours.Add("Green"); colours.Add("Blue"); Console.WriteLine(colours[0]);