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.

Top Tips:

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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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Choose a random number

Computers can't think for themselves - they can only follow instructions., so getting them to choose a number that is truely random is not easy. Thankfully, most programming languages have a function that will choose a number for you that appears to be chosen at random.

This example generates a random integer between 0 and 10 and saves it into a variable called r

' do this once, at the start of your code Randomize() ' store a random number between 0 and 10 Dim r As Integer r = Rnd() * 10
# do this once, at the start of your code import random ' store a random number between 0 and 10 r = random.randint(0, 10)
r = random(0, 10)
{ not specified in eduqas pseudocode reference }
// do this once, at the start of your code Random rnd = new Random(); // store a random number between 0 and 10 int r = rnd.Next(0, 10);