Array Basics in AP Computer Science A

What will be the output of the following code?

java
int[] arr = new int[3];
System.out.println(arr[0]);

What happens if you try to compile and run the following code?

java
int[] nums = {1, 2, 3};
System.out.println(nums[3]);

What is the output of the following code snippet?

java
int[] numbers = new int[5];
numbers[0] = 10;
numbers[4] = 20;
System.out.println(numbers[2] + numbers[4]);

Consider the following code snippet. What is the output?

java
int[] arr = {1, 2, 3, 4, 5};
for (int i = 0; i < arr.length; i++) {
 for (int j = 0; j < arr.length; j++) {
 if (arr[i] + arr[j] == 6) {
 System.out.println(arr[i] + " " + arr[j]);
 }
 }
}

What exception is thrown when you try to access an array element with an index that is out of bounds?

How do you access the first element of an array named values in Java?

Given the array double[] prices = {19.99, 24.50, 17.75};, how would you change the second element to 29.99?

What is the primary purpose of traversing an array?

Given an array int[] values = {5, 10, 15, 20};, write a loop to add 2 to each element. Which of the following code snippets correctly does this?

Which of the following is the correct way to declare an array of integers named numbers in Java?