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Questions and Answers
What will be the output of the following code snippet: int[] arr1 = {1, 2, 3}; arr2 = arr1; arr2 = 10; System.out.println(arr1);
Which of the following code snippets will result in a compilation error?
What will be the output of the following code? int[] arr = {1, 2, 3, 4}; System.out.println(arr[arr.length - 1]);
What will happen when the following code is executed: String[] fruits = {"Apple", "Banana", "Orange"}; System.out.println(fruits[fruits.length]);
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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)?
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Identify the issue in the following computed addressing formula in a 1D Array: Address = Base Address + (Index + 1) * Element Size
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If ArrayKo is an integer array having 6 elements with a base address of 1000, each integer occupies 2 bytes, what happens if you try to access A?
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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))
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Given a char array letters having 10 elements with a base address of 3000, what is the address of letters?
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What is the purpose of the array elements in the following code snippet: int seats[][] = new int; seats = 1;
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Why are arrays often used to implement matrix operations in scientific computing?
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Study Notes
Array Concepts
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Array declaration and initialization:
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int[] arr1 = {1, 2, 3};declares and initializes array with values. -
int[] arr2 = new int[];declares an array but doesn't initialize it. -
arr2 = arr1;assigns reference ofarr1toarr2, making them reference the same array. -
arr2 = 10;causes a runtime error as it attempts to assign an integer value to a reference.
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Error in array initialization:
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Int[] numbers = new int;causes a compilation error as it doesn't specify the size of the array. -
char letters[] = new char;causes a compilation error, similar to the previous point. -
String[] names = new String;causes a compilation error, similar to the previous point.
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Accessing array elements:
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System.out.println(arr[arr.length - 1]);prints the last element of the array, asarr.lengthgives the size of the array.
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ArrayIndexOutOfBoundsException:
- Accessing an element beyond the array bounds (index out of range) throws
ArrayIndexOutOfBoundsException. -
System.out.println(fruits[fruits.length]);will throw this error as the valid index goes from 0 tofruits.length - 1.
- Accessing an element beyond the array bounds (index out of range) throws
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Address calculation in 1D array:
- Address of an element:
Base Address + (Index * Element Size). Incorrect formula given:Base Address + (Index + 1) * Element Sizeis incorrect and will calculate the wrong address.
- Address of an element:
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2D Arrays:
- Used to represent matrices or tables with rows and columns.
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int seats[][] = new int[][];declares a 2D array but doesn't initialize it.
Array Applications
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Efficient storage and retrieval:
- Arrays, stored contiguously in memory, improve cache performance for matrix operations in scientific computing compared to other data structures.
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Representing real-world scenarios:
- They are used in implementing matrices, seating arrangements in cinemas, and other data structures.
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Description
Explore the fundamentals of arrays in Java programming, including declaration, initialization, and common errors. This quiz tests your knowledge on array access and exception handling in Java. Make sure to understand both correct usage and pitfalls associated with arrays.
