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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For loop (with step)

for loop is a count-controlled loop which means it your code says exactly how many times the loop should repeat. 

A for loop will use a variable to count between the minimum and maximum value. This variable is called the index, which is why for loops often use the variable i.

Rather than increasing the index by 1 each time, you can step up by any amount until you reach the maximum.

This example will count down from 10 to 1 then say "Blast off!" 

For i = 10 To 1 Step -1 MsgBox(i) Next i MsgBox("Blast off!")
for i in range(10,0,-1): print(i) print("Blast off!")
for i = 10 to 0 step -1 print(i) print("Blast off!")
{ There isn't a for loop with step specified } { but the following while loop does the same thing } i is integer set i = 10 while i >= 0 output i set i = i - 1 repeat output "Blast off!"
for(int i = 10; i > 0; i--) { Console.WriteLine(i); } Console.WriteLine("Blast off!");