Trimester reflection

• I most learned about new things in JAVA, and how to succeed in the AP exam
  • I’m glad I learned how to apply the web dev concepts I learned about last year to this year, and was able to lead my team to learning about it as well
  • I’m also glad I’m preparing early for the AP exam
• Leadership
  • I enjoy taking on the leadership role in my group and participating from a “teacher” perspective
  • It helped me learn more in order to

Collegeboard MCQ

• I scored a solid 40/40 on my CB exam

• Something I struggled with was thinking about recursion, I spent the longest time there. I have to adjust my thinking away from the typical mindset of loops and create tables for each iteration, keeping track of the different variables

Question: Consider the following code:

public class RecursionExample {
    public static int factorial(int n) {
        if (n == 0 || n == 1) {
            return 1;
        } else {
            return n * factorial(n - 1);
        }
    }

    public static void main(String[] args) {
        int result = factorial(4);
        System.out.println("The factorial of 4 is: " + result);
    }
}

What is the output of the above code?

A) 4
B) 12
C) 24
D) 120

Answer: Correct Answer: C) 24

Explanation: The given code defines a recursive function factorial to calculate the factorial of a number. In the main method, it calls factorial(4). Let’s break down the recursion:

• factorial(4) calls 4 * factorial(3)
• factorial(3) calls 3 * factorial(2)
• factorial(2) calls 2 * factorial(1)
• factorial(1) returns 1 (base case)

Now, substitute the values back:

• factorial(2) returns 2 * 1 = 2
• factorial(3) returns 3 * 2 = 6
• factorial(4) returns 4 * 6 = 24

So, the output of the code is 24, making option C the correct answer.