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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    Each skill has example code in VB.NET, Python, C# and Pseudocode for Edexcel, Eduqas and OCR GCSE.
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Getting part of a string (substring)

A string is some text. A substring is part of a bigger string. For example, "name" is a substring of "Hello, what's your name?".

This example creates a variable containing the string "What is your name" then displays the substring of the 5th and 6th characters ("is")


STRING message SET message TO "What is your name?" SEND SUBSTRING(message, 5,2) TO DISPLAY
Dim message as String = "What is your name?" 'Get the 5th and 6th characters MsgBox(message.SubString(5,2))
message = "What is your name?" # Get the 5th and 6th characters print(message[5:7])
message = "What is your name?" print(message.substring(5,2))
message is string set message = "What is your name?" output message.substring(5,2)
string message = "What is your name?"; // Get the 5th and 6th characters Console.WriteLine(message.Substring(5,2));