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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    Each skill has example code in VB.NET, Python, C# and Pseudocode for Edexcel, Eduqas and OCR GCSE.
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IF ... ELSE statement

If you want your code to choose between two possibilities you'll need an IF ... ELSE statement.

This example asks the user what their name is. If they answer the question it says hello. If they don't answer the question it displays an error message.

SEND "What's your name?" TO DISPLAY RECEIVE name FROM (STRING) KEYBOARD IF name = "" THEN SEND "You have to enter your name" TO DISPLAY ELSE SEND "HELLO " & name TO DISPLAY END IF
Dim name As String name = InputBox("What is your name?") If name = "" Then MsgBox("You have to enter your name") Else MsgBox("Hello " & name) End If
name = input("What is your name?") if name == "": print("You have to enter your name") else: print("Hello " + name)
name = input("What is your name?") if name == "" then print("You have to enter your name") else print("Hello " + name) endif
{ user input not specified in eduqas pseudocode reference } output "What is your name?" name is string set name = input if name == "" then output "You have to enter your name" else output "Hello " + name end if
Console.WriteLine("What is your name?"); string name = Console.ReadLine(); if(name == "") { Console.WriteLine("You have to enter your name"); } else { Console.WriteLine("Hello " + name); }