Data Structures & Algorithms Quiz

Given the following code snippet: int[] arr1 = {1, 2, 3}; int[] arr2 = new int[3]; arr2 = arr1; arr2[0] = 10 System.out.println(arr1[0]); What will the output be?

• A) 1

• B) 10

• C) 0

• D) An error will occur at runtime.

Which of the following code snippets will result in a compilation error?

• A) Int[] numbers = new int[5]; numbers[0] = 1;

• B) double[] fractions = {1.2, 2.4, 3.6}; System.out.println(fractions[2]);

• C) char letters[] = new char[3]; letters[3] = 'A';

• D) String[] names = new String[2]; names[0] = "Alice"; names[1] = 123;

What will be the output of the following code? int[] arr = {1, 2, 3, 4}; System.out.println(arr[arr.length - 1]);

• A) 1

• B) 4

• C) 3

• D) An error will occur

Analyze the following code: String[] fruits = {"Apple", "Banana", "Orange"}; System.out.println(fruits[fruits.length]); What will happen when this code is executed?

• A) It prints Orange.

• B) It prints null.

• C) An ArrayIndexOutOfBoundsException will be thrown.

• D) It prints the length of the array.

Analyze the following scenario: If the base address in a 1D integer array arr is 2000, and each integer takes 4 bytes, what will be the address of the 5th element (arr[4])?

• A) 2004

• B) 2020

• C) 2016

• D) 2008

Identify the issue in the following computed addressing formula in a 1D Array: Address = Base Address + (Index + 1) * Element Size

• A) It will compute the wrong address for the first element.

• B) It skips over even elements.

• C) It results in a runtime error for negative indices.

• D) It correctly computes addresses for all elements.

If ArrayKo is an integer array having 6 elements with a base address of 1000, and each integer occupies 2 bytes, what happens if you try to access A[6]?

• A) It will access memory at address 1012.

• B) It will access memory at address 1016.

• C) It will result in an out-of-bounds error if the array has more than 6 elements.

• D) It will access memory at address 1018.

Compare the following two formulas for computing element addresses. Which one is correct? Formula 1: Address = Base Address + (Index * Element Size) Formula 2: Address = Base Address + (Index * (Element Size + 1))

• A) Formula 1

• B) Formula 2

• C) Both are correct

• D) Neither is correct

Given a char array letters having 10 elements with a base address of 3000, what is the address of letters[8]?

• A) 3008

• B) 3009

• C) 3010

• D) 3016

A 2D array is being used to represent a seating arrangement in a cinema hall. Analyze the following code snippet and determine the purpose of the array elements: int seats [ ] [ ] = new int [10] [15]; seats[2][5] = 1;

• A) It stores the price of tickets for each seat.

• B) It marks seat (2,5) as occupied.

• C) It stores the age of the person sitting at that seat.

• D) It reserves 15 seats in row 10.