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#
Write data to a csv file
   

A csv file stands for a Comma-separated-values file. It will open as a spreadsheet (often in Excel) with lots of data organised into rows and columns.

When you open the csv file in a text editor (like notepad), the value for each cell is separated by a comma. Each row is written on a new line.

This example writes the 3 times table to a file called "timestables.csv":

e.g:

1, 3

2, 6

3, 9

4, 12

etc...

# open the file f = open("timestables.csv", "w") # loop from 1 to 10 for num in range(1, 10): # write to the file f.write(num) f.write(",") f.write(num*3) f.write("\n") # close the file so it can be read by other programs f.close()
// add this to the top of your file using System.IO; // open the file using(StreamWriter sw = new StreamWriter("timestables.csv")) { // lop from 1 to 10 for(int num = 1; num < 10; num++){ // write to the file sw.Write(num); sw.Write(","); sw.Write(num*3); sw.Write("\n"); } }

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