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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Casting (converting) to a real

Often it's useful to convert a string representation of a number (e.g. one typed in by the user) to a decimal number for use in calculations (real data type)

This example converts the string "1.1234" to the real value 1.1234

STRING str_number = "1.1234" ' There's not explicit casting. ' It's done implicitly by the data types of the variables REAL real_number = str_number
' Create a string variable containing a real value Dim StrNumber as String StrNumber = "1.1234" ' Cast the string to a real Dim DblNumber as Double DblNumber = Convert.toDouble(StrNumber)
# Create a string variable containing a real value str_number = "1.1234" # Cast the string to a real float_number = float(str_number)
str_number = "1.1234" float_number = float(str_number)
{ not specified in eduqas pseudocode reference }
// Create a string variable containing a real value strNumber = "1.1234"; // Cast the string to a real floatNumber = double.Parse(strNumber);