Understanding Array Manipulation and Functions

This video is the final practice session for AP Computer Science A, focusing on multiple choice questions. Tim Gallagher and Rob Schultz guide students through three coding problems involving Boolean arrays, removing duplicates from an array, and summing elements in a 2D array. The session emphasizes code tracing and understanding the logic behind each solution. Students are encouraged to download the accompanying PDF for hands-on practice. The instructors provide detailed explanations and animations to help visualize the code execution process.

What is the purpose of downloading the PDF file associated with the video?

• To have a backup of the video content

• To share with classmates

• To write and draw on while tracing code

• To submit as homework

In the first question, what is the initial value of 'j' in the for loop?

• Length of the array minus one

• 0

• Length of the array

• 1

What is the final output of the new vows array in the first question?

• False, False, True, True

• True, True, False, False

• True, False, True, True

• False, True, False, False

What is the intended function of the removeDupes method?

• To add duplicate numbers

• To remove adjacent duplicate numbers

• To remove all numbers

• To sort the array

What is the initial value of 'k' in the removeDupes method?

• 0

• Size of the array minus one

• 1

• Size of the array

What happens to the array list when an element is removed?

• It duplicates the element

• It shifts up

• It shifts down

• It remains unchanged

What is the main issue with the removeDupes method?

• It advances 'k' incorrectly after removal

• It removes non-duplicate elements

• It does not remove any elements

• It adds elements instead of removing

What is the initial value of the sum variable in the final question?

• The first element of the array

• 1

• 0

• The last element of the array

How many rows are there in the 2D array in the final question?

• 1

• 4

• 2

• 3

What is the final value of the sum after executing the code in the final question?

• 36

• 48

• 54

• 60