CAS Community   >   Resources   >  

Using a function to generate random coloured patterns on Raspberry Pi/Ubuntu

Program for a Raspberry Pi or Ubuntu PC that calls a "snow" function using different symbols, colours and weights to make simple screen-candy.

Phil Gardner

Created by Phil Gardner
last edited Dec 12 2017 by Phil Gardner

Produces and erases coloured patterns all over your terminal window/screen.

Running from IDE e.g. Geany starts from blank window.

Running from command-line blots out any work you had previously been doing(!)

If you have a Raspberry Pi, you already have the compiler to make the executable. You can load the multi-snow.cpp file into the Geany editor, then click on Build. Once built successfully, you can click on Execute.

If you are using Ubuntu, if you do not have the compiler, you can install it with…

sudo apt-get install build-essential

To compile from command line using compiler:

g++ multi-snow.cpp

…then run the executable with:


Deluxe compilation instructions, for an executable with a more descriptive name:

g++ -o snow multi-snow.cpp

…run with:


“What’s it got in its pocketsess?” Constants, integer and string data-types, random numbers (not seeded in this case), % (modulo remainder), while loop, switch-case selection statement, functions and calls, escape-sequences for old-school terminal screens to send cursor to any x,y position in window. No fishes… curses!

Book available on Amazon:

574 pages, over 200 programs, suitable for GCSE or A level students.

Downloaded 604 times.


This resource has attached files: to access these files, please tick the box below to assent to the license terms
License: The resources on CAS website are under Creative Commons Attribution-Share Alike 3.0 licence unless otherwise specified by the resource creators.

You must confirm that you have read and agree the licence's ToS before you can download the attachments of this resource.

I have read the licence agreement of this resource and agree to abide by its terms and conditions.

Feedback and Comments

Available when logged in (join via the front page, for free):
  • View 0 comments on this resource.
  • View resource history, links to related resources.
  • Leave feedback for the author(s), or help by editing the resource.

© 2021 BCS, The Chartered Institute for IT Registered charity: No. 292786
Using the websiteDisclaimer of liabilityCookies policyPrivacy notice