Data Structure MCQ (Multiple Choice Questions)

Data Structure Questions and Answers – Array and Array Operations

This set of Data Structure Multiple Choice Questions & Answers (MCQs) focuses on “Array and Array Operations”.

1. Which of these best describes an array?

A) A data structure that shows a hierarchical behavior
B) Container of objects of similar types
C) Arrays are immutable once initialised
D) Array is not a data structure

... Answer is B)
Explanation: Array contains elements only of the same type.

2. How do you initialize an array in C?

A) int arr[3] = (1,2,3);
B) int arr(3) = {1,2,3};
C) int arr[3] = {1,2,3};
D) int arr(3) = (1,2,3);

... Answer is C)
Explanation: This is the syntax to initialize an array in C.

3. How do you instantiate an array in Java?

A) int arr[] = new int(3);
B) int arr[];
C) int arr[] = new int[3];
D) int arr() = new int(3);

... Answer is C)
Explanation: Note that int arr[]; is declaration whereas int arr[] = new int[3]; is to instantiate an array.


4. Which of the following is the correct way to declare a multidimensional array in Java?

A) int[] arr;
B) int arr[[]];
C) int[][]arr;
D) int[[]] arr;

... Answer is C)
Explanation: The syntax to declare multidimensional array in java is either int[][] arr; or int arr[][];


5. What is the output of the following Java code?