Data Structures and Arrays Quiz
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Questions and Answers

What value is assigned by default to a boolean type in an array?

  • '\u0000'
  • null
  • 0
  • false (correct)
  • What would be the result of trying to execute the following code?

    double[] myList;
    myList = {1.9, 2.9, 3.4, 3.5};```
    

  • It would initialize the array successfully.
  • It would compile but not run correctly.
  • It would result in a syntax error. (correct)
  • It would create an array but not assign values.
  • Given the array declaration double[] myList = {1.9, 2.9, 3.4, 3.5};, what is the length of myList?

  • 5
  • 3
  • 4 (correct)
  • 10
  • What happens if you try to use the code myList = myList + myList; before initializing myList?

    <p>It will result in a compile-time error.</p> Signup and view all the answers

    Which of the following is a correct way to declare, create, and initialize an array all in one statement?

    <p>int[] myList = {10, 20, 30};</p> Signup and view all the answers

    How do you read input values into an array using java.util.Scanner?

    <p>for (int i = 0; i &lt; myList.length; i++) { myList[i] = input.nextDouble(); }</p> Signup and view all the answers

    What is the purpose of the enhanced for loop in Java?

    <p>To iterate through an array without needing an index variable.</p> Signup and view all the answers

    What error is present in the code snippet for finding the largest element?

    <p>myList is being assigned to max directly.</p> Signup and view all the answers

    How is the sum of all elements in an array calculated?

    <p>total += myList[i]; - inside a for loop.</p> Signup and view all the answers

    What is the purpose of the line 'myList[i] = Math.random() * 100;'?

    <p>To initialize myList with double values ranging from 0 to 100.</p> Signup and view all the answers

    What distinguishes a static data structure from a dynamic data structure?

    <p>Static data structures have a fixed memory size.</p> Signup and view all the answers

    Which of the following is an example of a linear data structure?

    <p>Stack</p> Signup and view all the answers

    How is an array created in programming?

    <p>datatype[] arrayRefVar = new datatype[arraySize];</p> Signup and view all the answers

    What is the main limitation of an array once it has been created?

    <p>The array cannot be resized.</p> Signup and view all the answers

    In which type of data structure can data elements not be traversed in a single run?

    <p>Non-Linear Data Structure</p> Signup and view all the answers

    Which statement about arrays is incorrect?

    <p>An array can dynamically change its size during runtime.</p> Signup and view all the answers

    Which of the following arrays represents a correct declaration and creation in one step?

    <p>int arrayRefVar[] = new int[20];</p> Signup and view all the answers

    Which type of data structure is an example of a dynamic data structure?

    <p>Linked List</p> Signup and view all the answers

    Study Notes

    Data Structures

    • Data structures are storage mechanisms used to organize and store data.
    • Linear Data structures arrange elements sequentially, with each element linked to its neighbors. Examples include arrays, stacks, and queues.
    • Static Data structures have a fixed memory size, making element access easier but limiting flexibility. Arrays are an example.
    • Dynamic Data structures have flexible size, adapting during runtime for potential memory efficiency. Queues and stacks are examples.
    • Non-linear Data structures don't arrange elements sequentially. Data traversal requires multiple steps. Examples include trees and graphs.

    Arrays

    • Arrays are collections of the same data type stored in contiguous memory locations.
    • The size of an array is fixed once it's created.
    • Declaring Array Variables:
      • datatype[] arrayRefVar; (e.g., double[] myList;)
    • Creating Arrays:
      • arrayRefVar = new datatype[arraySize]; (e.g., myList = new double[10];)
    • The arrayRefVar references the first element in the array, while arrayRefVar[arraySize - 1] references the last element.

    Array Length and Default Values

    • To find the size of an array use arrayRefVar.length.
    • Default values are assigned to array elements upon creation:
      • 0 for numeric primitives (e.g., int, double)
      • '\u0000' for char
      • false for boolean

    Using Indexed Variables and Array Initializers

    • Indexed variables (arrayRefVar[index]) work like regular variables for accessing and manipulating elements.
    • Array Initializers provide a shorthand for declaring, creating, and initializing arrays:
      • datatype[] arrayRefVar = {value1, value2, ...}; (e.g., double[] myList = {1.9, 2.9, 3.4, 3.5};)

    Processing Arrays: Examples

    • Input values: Read user-input for each element.
    • Random Values: Generate random numbers for each element.
    • Printing: Display all array elements.
    • Summing: Calculate the sum of all elements.
    • Finding the Largest: Identify the largest element.
    • Finding the Smallest Index of the Largest Element: Determine the index of the largest element.

    Enhanced For Loop (for-each loop)

    • Introduced in JDK 1.5, the enhanced for loop allows sequential iteration without using index variables.
    • Syntax: for (elementType value: arrayRefVar) { ... }
    • Suitable for simple iteration but not for altering the array order or modifying elements.

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    Related Documents

    COSC125_week3_Arrays.pptx

    Description

    Test your knowledge on various data structures and their characteristics, including linear, static, dynamic, and non-linear types. This quiz also covers the fundamentals of arrays, including declaration and creation. Challenge yourself and see how well you understand these essential concepts of computer science.

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