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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While loop

A while loop will keep repeating whilst a condition is met (it will stop repeating when the condition is no longer met). 

This is known as a pre-conditioned loop because the program checks if the condition has been met before the code in the loop runs. This means that the minimum number of times the loop will run could be 0.

It is also an example of indefinite iteration because the loop could carry on forever unless the condition is met.

This example program keeps asking the user "Are we nearly there yet" until they say "yes"

STRING nearly_there SET nearly_there TO "no" WHILE nearly_there <> "yes" SEND "Are we nearly there yet?" TO DISPLAY RECEIVE nearly_there FROM (STRING) KEYBOARD END WHILE
Dim nearly_there As String nearly_there = "no" While nearly_there <> "yes" nearly_there = InputBox("Are we nearly there yet?") End While
nearly_there = "no" while nearly_there != "yes": nearly_there = input("Are we nearly there yet?")
nearly_there = "no" while nearly_there != "yes" nearly_there = input("Are we nearly there yet?") endwhile
{ user input not specified in eduqas pseudocode reference } nearlythere is string set nearlythere = "no" while nearlythere <> "yes" output "Are we nearly there yet?" nearlythere = input repeat
string nearly_there = "no"; while(nearly_there != "yes") { Console.WriteLine("Are we nearly there yet?"); nearly_there = Console.ReadLine(); }