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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Concatenating strings

A string is some text such as "Hello"

Concatenating means joining together or adding / appending on to the end.

Concatenating strings means joining two strings together.

In this example, two strings (first_name and last_name) are concatenated (joined together) and saved in another string variable called full_name with a space in between them.

STRING first_name STRING last_name STRING full_name SET first_name TO "Bob" SET last_name TO "Builder" SET full_name TO first_name & " " & last_name
' Create three string variables Dim first_name As String Dim last_name As String Dim full_name As String ' set names first_name = "Bob" last_name = "Builder" ' concatenate first and last names full_name = first_name & " " & last_name
# create three string variables first_name = "Bob" last_name = "Builder" # concatenate first and last names full_name = first_name + " " + last_name
first_name = "Bob" last_name = "Builder" full_name = first_name + " " + last_name
firstname is string lastname is string fullname is string set firstname = "Bob" set lastname = "Builder" set fullname = firstname + " " + lastname
// create three string variables string firstName = "Bob"; string lastName = "Builder"; // concatenate first and last names fullName = firstName + " " + last_name;