Array Concepts and Addressing

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Questions and Answers

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

An error will occur at runtime. (correct)

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

char letters[] = new char; letters = 'A';

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

String[] names = new String; names = 'Alice'; names = 123;

Int[] numbers = new int; numbers = 1; (correct)

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

4 (correct)

An error will occur

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

An ArrayIndexOutOfBoundsException will be thrown. Signup and view all the answers

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)?

2020 Signup and view all the answers

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

It will compute the wrong address for the first element. Signup and view all the answers

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`?

It will result in an out-of-bounds error if the array has more than 6 elements. Signup and view all the answers

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

Formula 1 Signup and view all the answers

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

3008 Signup and view all the answers

Analyze the following code snippet: `int seats[][] = new int; seats = 1;` Determine the purpose of the array elements.

It marks seat (2,5) as occupied. Signup and view all the answers

Analyze why arrays are often used to implement matrix operations in scientific computing.

Arrays provide contiguous memory storage, which improves cache performance for matrix operations. Signup and view all the answers

Study Notes

Array Concepts

Array Declaration and Initialization: An array is declared using the data type[] arrayName syntax. Example: int[] myArray = {1, 2, 3};
Array Element Access: Individual elements in an array are accessed using their index, starting from 0. Example: myArray[0] refers to the first element (value 1 in this case).
Array Size: The length property of an array returns the number of elements in the array.
ArrayIndexOutOfBoundsException: This exception occurs when you try to access an element outside the valid index range of the array. Example: myArray[3] would throw an exception as the array only has 3 elements.

Array Addressing and Computation

Base Address: This is the memory address of the start of the array.
Element Size: The number of bytes each element occupies in memory.
Address Calculation: The address of an element is calculated using the formula: Address = Base Address + (Index * Element Size)

Two-Dimensional Arrays

Representation: Two-dimensional arrays are often used to represent tables or matrices. They consist of rows and columns.
Element Access: Elements in a 2D array are accessed using two indices: the row index and the column index. Example: myArray[2][3] refers to the element at the third row and fourth column.

Array Operations

Matrix Operations: Arrays are commonly used to implement matrix operations in scientific computing because they provide contiguous memory storage, enhancing cache performance.

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Description

This quiz covers fundamental concepts of arrays including declaration, initialization, element access, and addressing. You'll explore common exceptions like ArrayIndexOutOfBoundsException and how to calculate memory addresses for array elements. Test your understanding of these critical programming principles!