CS 100 :: Spring 2025 :: In-Class Links

This is where Dave will be posting links to content used within the lectures and assignments.

A † indicates that it was not shown in class, but you may want to check it out if you're interested (you are not required to).

Lecture 21 (Tuesday July 22, 2025)

Join the VEVOX session
https://vevox.app/#/m/493891376
Visualization of the Enigma Machine
YouTube
Visualization of AES
YouTube
Online MD5 Hash Generator
https://www.md5hashgenerator.com/
Modular Exponentiation
https://planetcalc.com/8977/

Extra Content

Dave's Spreadsheet Examples for working with Arrays
s25-dave-array-examples.xlsx (right-click save as)

Lecture 20 (Thursday July 17, 2025)

Join the VEVOX session
https://vevox.app/#/m/404830431
Spreadsheet for today
cs100-in-class-July-17-2025.xlsx (right-click save as)

Lecture 19 (Tuesday July 15, 2025)

Join the VEVOX session
https://vevox.app/#/m/404510237
Spreadsheet for today
cs100-in-class-July-15-2025.xlsx (right-click save as)

Lecture 18 (Thursday July 10, 2025)

Join the VEVOX session
https://vevox.app/#/m/415534968
Spreadsheet for today
cs100-in-class-July-10-2025.xlsx (right-click save as)

Lecture 17 (Tuesday July 08, 2025)

Join the VEVOX session
https://vevox.app/#/m/488239617
Spreadsheet for today
cs100-in-class-July-08-2025.xlsx (right-click save as)

Lecture 16 (Thursday June 26, 2025)

Join the VEVOX session
https://vevox.app/#/m/478324016
Spreadsheet for today
cs100-in-class-June-26-2025.xlsx (right-click save as)

Lecture 15 (Tuesday June 24, 2025)

Join the VEVOX session
https://vevox.app/#/m/423945373
Spreadsheet for today
cs100-in-class-June-24-2025.xlsx (right-click save as)

Note: Lecture 14 was Q&A

Lecture 13 (Tuesday June 17, 2025)

Join the VEVOX session
https://vevox.app/#/m/434013984

Assignment 2

Quiz Template:
quiz.html

Lab 5

Starter lab file:
lab-quiz.html (you may want to right-click save as...)

Lecture 12 (Thursday June 12, 2025)

Join the VEVOX session
https://vevox.app/#/m/494713091
What HTTP header is my browser sending?
https://www.whatismybrowser.com/detect/what-http-headers-is-my-browser-sending
CS 100 Counter (with cookies):
https://student.cs.uwaterloo.ca/~cs100/count/
Chrome Browser Cookies
chrome://settings/cookies
Google Ad Center
https://myadcenter.google.com
https://myadcenter.google.com/controls
Your Battery Level
battery.html
UW Weather:
http://weather.uwaterloo.ca/waterloo_weather_station_data.xml
Background communication example
ajax.html
Cookie Clicker (just for fun)†
https://orteil.dashnet.org/cookieclicker/

Lecture 11 (Tuesday June 10, 2025)

Join the VEVOX session
https://vevox.app/#/m/495977185
What HTTP header is my browser sending?
https://www.whatismybrowser.com/detect/what-http-headers-is-my-browser-sending
Scratch:
scratch.mit.edu
Alert:
alert.html
Today:
today.html
Count:
count.html
Boxes:
boxes.html
Lights:
https://helloenjoy.itch.io/lights

Lab 4 (Friday June 6, 2025)

Lecture 10 (Thursday June 5, 2025)

Join the VEVOX session
https://vevox.app/#/m/482491682
CSS Validator
https://jigsaw.w3.org/css-validator/
Dave's live demo page
https://student.cs.uwaterloo.ca/~cs100/demo/
W3 Schools (CSS)
https://www.w3schools.com/css/
Google Fonts
https://fonts.google.com/knowledge
Font Fallbacks
https://www.w3schools.com/css/css_font_fallbacks.asp
Free book on fonts (provided by google)†
Stop Stealing Sheep
Classic Great Gatsby meme
meme

Lecture 09 (Tuesday June 3, 2025)

Join the VEVOX session
https://vevox.app/#/m/460827461
Classic Great Gatsby meme
meme

Lab 3

Lecture 08 (Thursday May 29, 2025)

Join the VEVOX session
https://vevox.app/#/m/401914092
HTML Validator
https://validator.w3.org/
For Dave to cut & paste: I ❤️ Beyoncé!

Lecture 04 (Thursday May 15, 2025)

Join the VEVOX session
https://vevox.app/#/m/478042224
Example of an annoying URL with a space in it (note the %20 and how a space in ASCII is #20):
https://student.cs.uwaterloo.ca/~cs100/links/this%20URL%20has%20spaces%20in%20it.txt
Hiding a URL by using the (Hex) ASCII codes:
https://%75%77%61%74%65%72%6C%6F%6F%2E%63%61
Scene from the movie The Martian:
YouTube
† Fun retro fact! The Martian scene mentions the game: Leather Goddesses of Phobos from 1986. You can play it online here.
Unicode Emoji list:
https://www.unicode.org/emoji/charts/emoji-list.html
† xkcd joke on combining emojis:
https://xkcd.com/1813/
Look up your Waterloo faculty colour by Hex Code:
https://uwaterloo.ca/brand/how-express-our-brand/colour
† images that contain all 2²⁴ colours:
https://allrgb.com/

Lecture 03 (Tuesday May 13, 2025)

Join the VEVOX session
https://vevox.app/#/m/403260593
† Fun Stereogram
Gorilla

Lecture 02 (Thursday May 8, 2025)

Join the VEVOX session
https://vevox.app/#/m/456397634
† Powers of 10 (going from high level to low level):
YouTube
† Babbage's Difference Engine (what a mechanical machine that uses 10 digits might look like)
YouTube

Lecture 01 (Tuesday May 6, 2025)

Course Outline:
https://outline.uwaterloo.ca/viewer/view/nwk3kw
Join the VEVOX session
https://vevox.app/#/m/416293147
† Challenge Dave to a game on Board Game Arena (Dave's username: Dave Tompkins)
boardgamearena.com
(but only if you're keen -- there are no "bonus" / participation points)

Assignment Zero

Note: Our apologies -- there was some miscommunication over whether there was to be a secret word or a secret video for Assignment Zero — here are both (use whatever you need):

The secret video is: here
The secret word is: Gorilla