Arrays and strings are fundamental concepts in computer programming, serving as essential tools for data organization and manipulation.
An array is a data structure that stores a collection of elements, typically of the same type, in a contiguous block of memory. This allows for efficient access and modification of elements using an index, such as accessing the third element in an array of numbers. Arrays are versatile and can hold integers, characters, objects, or other data types, making them ideal for tasks like sorting lists, searching for values, or performing calculations on datasets.
A string, meanwhile, is a sequence of characters that represents text. In most programming languages, strings are implemented as arrays of characters, enabling operations like concatenation (joining strings), substring extraction (pulling out a portion of text), and searching for patterns. For example, a string might store a word like “hello,” which can be analyzed, modified, or compared with other strings for applications in text processing, user interfaces, or data encryption.
Together, arrays and strings form the backbone of many algorithms. Arrays provide the structure for handling multiple items, while strings specialize in textual data, often intersecting in real-world uses like parsing files, validating inputs, or building dynamic web content. Understanding their properties—such as fixed size in arrays versus mutable length in some strings—helps developers optimize performance and write efficient code.
Table of Contents
- Part 1: OnlineExamMaker AI Quiz Generator – The Easiest Way to Make Quizzes Online
- Part 2: 20 Arrays & Strings Quiz Questions & Answers
- Part 3: AI Question Generator – Automatically Create Questions for Your Next Assessment
Part 1: OnlineExamMaker AI Quiz Generator – The Easiest Way to Make Quizzes Online
Are you looking for an online assessment to test the Arrays & Strings skills of your learners? OnlineExamMaker uses artificial intelligence to help quiz organizers to create, manage, and analyze exams or tests automatically. Apart from AI features, OnlineExamMaker advanced security features such as full-screen lockdown browser, online webcam proctoring, and face ID recognition.
Take a product tour of OnlineExamMaker:
● Includes a safe exam browser (lockdown mode), webcam and screen recording, live monitoring, and chat oversight to prevent cheating.
● AI Exam Grader for efficiently grading quizzes and assignments, offering inline comments, automatic scoring, and “fudge points” for manual adjustments.
● Embed quizzes on websites, blogs, or share via email, social media (Facebook, Twitter), or direct links.
● Handles large-scale testing (thousands of exams/semester) without internet dependency, backed by cloud infrastructure.
Automatically generate questions using AI
Part 2: 20 Arrays & Strings Quiz Questions & Answers
or
1. Question: What is an array in programming?
A) A collection of elements of different data types
B) A collection of elements of the same data type stored in contiguous memory
C) A single variable that can hold multiple values of any type
D) A function to manipulate strings
Answer: B
Explanation: An array is a data structure that stores elements of the same data type in contiguous memory locations, allowing efficient access via indices.
2. Question: How do you declare an array of integers with 5 elements in C++?
A) int array[5];
B) array int[5];
C) int array = [5];
D) array = int[5];
Answer: A
Explanation: In C++, arrays are declared using the syntax “type arrayName[size];”, so “int array[5];” creates an array of 5 integers.
3. Question: What is the output of accessing the third element in an array declared as int arr[] = {1, 2, 3, 4, 5}; using arr[2]?
A) 1
B) 2
C) 3
D) 4
Answer: C
Explanation: Array indices start at 0, so arr[2] refers to the third element, which is 3.
4. Question: In Java, what method is used to get the length of an array?
A) length()
B) size()
C) length
D) getLength()
Answer: C
Explanation: In Java, arrays have a public field called “length” that returns the number of elements in the array.
5. Question: What is a string in programming?
A) A sequence of characters
B) An array of numbers
C) A single character variable
D) A function for calculations
Answer: A
Explanation: A string is a data type that represents a sequence of characters, often stored as an array of characters in memory.
6. Question: How do you concatenate two strings in Python?
A) string1 + string2
B) string1.concat(string2)
C) string1 & string2
D) string1.append(string2)
Answer: A
Explanation: In Python, strings can be concatenated using the “+” operator, which combines them into a single string.
7. Question: What is the result of reversing the string “hello”?
A) “hello”
B) “olleh”
C) “Hello”
D) “HELLO”
Answer: B
Explanation: Reversing “hello” means flipping the order of characters, resulting in “olleh”.
8. Question: Is the string “radar” a palindrome?
A) Yes
B) No
C) Only if converted to uppercase
D) Only if spaces are removed
Answer: A
Explanation: A palindrome reads the same forwards and backwards; “radar” does, so it is a palindrome.
9. Question: Which sorting algorithm is commonly used for arrays?
A) Binary search
B) Quick sort
C) Linear search
D) Hashing
Answer: B
Explanation: Quick sort is an efficient sorting algorithm for arrays that uses divide-and-conquer to arrange elements in order.
10. Question: How do you perform a linear search in an array?
A) Divide the array in half repeatedly
B) Check each element sequentially until found
C) Sort the array first
D) Use a hash table
Answer: B
Explanation: Linear search involves iterating through the array one element at a time to find the target value.
11. Question: What is a 2D array?
A) An array with only one row
B) An array of arrays, forming a matrix
C) A string array
D) A single-dimensional array
Answer: B
Explanation: A 2D array is a collection of elements arranged in rows and columns, essentially an array where each element is another array.
12. Question: In Java, how do you get a substring from “programming” starting at index 5?
A) “programming”.substring(5)
B) “programming”.substr(5)
C) “programming”.slice(5)
D) “programming”.getSub(5)
Answer: A
Explanation: In Java, the substring() method extracts a portion of the string starting from the specified index, so “programming”.substring(5) gives “amming”.
13. Question: Are strings immutable in Java?
A) Yes
B) No
C) Only for certain strings
D) Depends on the length
Answer: A
Explanation: In Java, strings are immutable, meaning once created, their value cannot be changed, and any modification creates a new string.
14. Question: What is the main difference between an array and a linked list?
A) Arrays are dynamic, linked lists are static
B) Arrays store elements in contiguous memory, linked lists use pointers
C) Linked lists are faster for access, arrays are not
D) Arrays cannot hold strings
Answer: B
Explanation: Arrays store elements in contiguous memory for fast access, while linked lists use nodes with pointers, making insertion/deletion easier but access slower.
15. Question: How do you compare two strings in C++ for equality?
A) string1 == string2
B) string1.equals(string2)
C) strcmp(string1, string2) == 0
D) Both A and C, depending on context
Answer: D
Explanation: In C++, for std::string, you use “==” for equality; for C-style strings, strcmp() returns 0 if equal.
16. Question: What is the result of reversing the array [1, 2, 3, 4]?
A) [4, 3, 2, 1]
B) [1, 2, 3, 4]
C) [2, 1, 4, 3]
D) [3, 2, 1, 4]
Answer: A
Explanation: Reversing an array means swapping elements from the start and end, so [1, 2, 3, 4] becomes [4, 3, 2, 1].
17. Question: How do you find the maximum element in an array [5, 3, 9, 1]?
A) By sorting the array
B) By iterating and comparing each element
C) Using binary search
D) By reversing the array
Answer: B
Explanation: To find the maximum, iterate through the array and keep track of the largest element encountered.
18. Question: What does the length of a string represent?
A) The number of characters in the string
B) The memory size of the string
C) The number of words in the string
D) The index of the last character
Answer: A
Explanation: The length of a string is the count of characters it contains, excluding any null terminator in some languages.
19. Question: How do you initialize an array in Java?
A) int[] arr = new int[5];
B) int arr[] = {1, 2, 3, 4, 5};
C) Both A and B
D) int arr = new int[5] {1, 2, 3};
Answer: C
Explanation: In Java, you can initialize an array using “new int[5]” for an array of a specific size or directly with values like “{1, 2, 3, 4, 5}”.
20. Question: What is a common method to check if a string contains a substring?
A) contains()
B) includes()
C) find()
D) All of the above, depending on the language
Answer: D
Explanation: Methods like contains() in Java, includes() in JavaScript, or find() in Python can check for substrings, though syntax varies by language.
or
Part 3: AI Question Generator – Automatically Create Questions for Your Next Assessment
Automatically generate questions using AI