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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.

- Explore the different categories of skills at the top of this page
Each skill has example code in VB.NET, Python, C# and Pseudocode for Edexcel, Eduqas and OCR GCSE.

- Search for a specific skill
If you know what you're looking for, use the search bar above the categories list.

A function is like a **procedure** except that it always **returns** a value.

**Parameters** are variables that allow you to send data to the **function** to customise what it does or how it works.

The **parameters** are the variables named in brackets after the **function** name.

This return value is calculated when the function is **called** and can be saved into a variable or used later in the program.

Both **functions** and **procedures** are sections of code that have been given a name, which can be re-used to do something useful.

*This example defines a function which will generate and return a random number. It has two parameters which allow you to set the minimum and maximum number the random number will be between.*

*This function is called to choose a random number between 10 and 20 and then called again to choose a random number between 50 and 100. Both numbers are returned and saved into separate variables.*

# Define the function
FUNCTION ChooseRandomBetween(min, max)
BEGIN FUNCTION
INTEGER n
SET n TO RANDOM(max - min) + min
RETURN n
END FUNCTION
# Call the function
INTEGER FirstNumber
SET FirstNumber = ChooseRandomBetween(10, 20)
INTEGER SecondNumber
SET SecondNumber TO ChooseRandomBetween(50, 100)

' Define the function
Sub ShowRandomBetween(min As Integer, max As Integer)
dim n As Integer
n = (Rnd() * (max - min)) + min
Return n
End Function
' Call the function
Dim FirstNumber As Integer
FirstNumber = ShowRandomBetween(10, 20)
Dim SecondNumber As Integer
SecondNumber = ShowRandomBetween(50, 100)

import random
# define the function
def choose_random_between(min, max):
print(random.randint(min, max))
# call the function
first_number = choose_random_between(10, 20)
second_number = choose_random_between(50, 100)

// this code assumes there is a function defined called random(min, max)
// which chooses a random number between a minimum and maximum (inclusive)
// this is not in the pseudocode spec
// define the function
function choose_random_between(min, max):
return random(min, max)
endfunction
// call the function
first_number = choose_random_between(10, 20)
second_number = choose_random_between(50, 100)

{ not specified in eduqas pseudocode reference }

// define the function
int showRandomBetween(int min, int max)
{
Random r = new Random();
int number = r.Next(min, max);
return number;
}
// call the function
int firstNumber = showRandomBetween(10, 20);
int secondNumber = showRandomBetween(50, 100);

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