All posts by Max Johnson

How Recursion Works in 7 Gifs

Recursion is one of those topics that many students struggle with. When you’re first learning how to code, recursion is often difficult to grasp. Gif #1 (Visual Animation of Recursion) Gif #2: How Many in the line?     Gif #3 : Fibonacci Sequence Gif #4 : Pascals Triangle Code Gif #5: Pascals Triangle Animation   Gif … Continue reading How Recursion Works in 7 Gifs →

Fibonacci Sequence Code and Animation Explained

The Fibonacci Sequence is one of the classic recursive algorithms that you learn in computer science. Mathematically, the fibonacci sequence looks like this f(x) = f(x-1) + f(x-2)  and base values of either f0 =0 and f1=1 The Java Code Download the Java Code [crayon-5df1c730ef14b832970455/] The Python Code Download the Python Code [crayon-5df1c730ef155114702777/] Fibonnacci Recursion … Continue reading Fibonacci Sequence Code and Animation Explained →

5 Tips for the AP Computer Science A Exam

Tip 1  : Floating Point Error! If you are asked to compare doubles with either “==” or “!=” the answer is probably “Floating point error”!   (demo of floating point error in Java)   Tip 2 : Constructors are not inherited! The code below fails because constructors are not inherited! public class SuperClass{ } public class … Continue reading 5 Tips for the AP Computer Science A Exam →