Recursion Visualizer – AP CSA | ShowMeClass

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Recursion Visualizer

AP CSA · Unit 10: Recursion

Learning Objectives

Trace recursive call stacks step by step

Identify base case vs recursive case

Understand how return values propagate

Compare recursion tree shapes for different algorithms

Anatomy of Recursion

Base case: Stops the recursion
Recursive case: Calls itself with smaller input
Return: Values bubble back up the call stack

Stack Overflow occurs if no base case is reached

Legend

Active (executing)

Returned (base case hit)

Waiting (paused)

Not yet called

RecursionCall StackBase CaseFibonacci

Function:factorial

Step:0 / 0

Result:—

Call Stack

Total Calls

0

Max Depth

0

Base Cases

0

Result

—

Step

0

Algorithm

Input n 5

Speed (ms) 400

Code

Quick Quiz▼

1. Every recursive method must have a:

Loop Base case Array parameter void return type

2. fibonacci(5) makes how many total calls?

5 9 15 25

3. Recursion uses which data structure internally?

Queue Stack (call stack) Linked list Hash map