Categories: All Variables and Constants  String manipulation  Builtin functions  Input and output  Arrays  Conditional logic  Repetition / Iteration  Functions / Procedures 

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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.

Introduction

This website aims to give a quick reference for VB.NET, Python and C# and pseudocode and is aimed primarily at teachers & students working towards a GCSE or A Level 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.

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Skill
Description
VB.NET
Python
C#
Create a list of integers
   

A list is similar to an array: both allow more than one piece of data to be stored in the same variable.

It's not possible to add or remove data to an array after it's been set for the first time but it is possible to add or remove data to a list.

This example creates a list called numbers and adds three integer numbers into it before displaying the sum of all the numbers added together.

numbers = [] numbers.append(1) numbers.append(2) numbers.append(3) print(sum(numbers))
// using System.Collections.Generic; // using System.Linq; List<int> numbers = new List<int>(); numbers.Add(1); numbers.Add(2); numbers.Add(3); // Sum requires System.Linq Console.WriteLine(numbers.Sum());

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