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

Show:

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.

Top Tips:

  • Explore the different categories of skills at the top of this page
    Each skill has example code in Python, C#. You can also enable VB.NET and Pseudocode for OCR GCSE if you'd find that useful.
  • Search for a specific skill
    If you know what you're looking for, use the search bar above the categories list.
Skill
Description
VB.NET
Python
C#
While loop
   

A while loop will keep repeating whilst a condition is met (it will stop repeating when the condition is no longer met). 

This is known as a pre-conditioned loop because the program checks if the condition has been met before the code in the loop runs. This means that the minimum number of times the loop will run could be 0.

It is also an example of indefinite iteration because the loop could carry on forever unless the condition is met.

This example program keeps asking the user "Are we nearly there yet" until they say "yes"

nearly_there = "no" while nearly_there != "yes": nearly_there = input("Are we nearly there yet?")
string nearly_there = "no"; while(nearly_there != "yes") { Console.WriteLine("Are we nearly there yet?"); nearly_there = Console.ReadLine(); }

Loading...