All posts by Penjee

What is DeMorgan’s Law in Programming? [ Answered with pics]

Demorgan’s Law is something that any student of programming eventually needs to deal with. Just tell me the “formula”: ok the diagram below shows the 2 ways that you can re-write a compound boolean expression using DeMorgan’s Law. (The very bottom of this page shows coding examples and common misconceptions) How do you say “no” to … Continue reading What is DeMorgan’s Law in Programming? [ Answered with pics] →

Cisco Binary Number Game [ It’s Back and here and free!]

Many teachers have recently asked : What happened to the Cisco Binary numbers game? Many computer science teachers have used Cisco’s popular game to help reinforce their binary numbers lessons.  Cisco has removed the game! We here at Penjee have created our own version of the Cisco Binary Number Game here! It’s free., requires no loginning in … Continue reading Cisco Binary Number Game [ It’s Back and here and free!] →

How to Use a Variable and Function in Alice 2

One of the ways that Alice teaches student about returning a value can be seen in how methods, variables and functions work. Methods cannot be dragged into variable values   This is because , in Alice, a method is an action and does not return a value. Functions can be dragged into variable values   Since functions return a … Continue reading How to Use a Variable and Function in Alice 2 →