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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Repeat Until loop

A repeat until loop will keep repeating until a condition is met.

This is known as a post-conditioned loop because the program checks if the condition has been met after the code in the loop runs. This means that the loop will always run at least once.

It is also an example of indefinite iteration because the loop could carry on forever if the condition is never met.

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

REPEAT SEND "Are we nearly there yet?" TO DISPLAY RECEIVE nearly_there FROM (STRING) KEYBOARD UNTIL nearly_there = "yes"
Do nearly_there = InputBox("Are we nearly there yet?") Loop Until nearly_there = "yes"
# there is no post-conditioned loop in python # but this works in the same way while True: nearly_there = input("Are we nearly there yet?") if nearly_there == "yes": break
do nearly_there = input("Are we nearly there yet?") until nearly_there == "yes"
{ user input is not specified in eduqas pseudocode reference } nearlythere is string repeat output "Are we nearly there yet?" nearlythere = input until nearlythere == "yes"
string nearly_there; do { Console.WriteLine("Are we nearly there yet?"); nearly_there = Console.ReadLine(); } while (nearly_there != "yes");