Array Data Structure Quiz for Beginners

Last Updated :
Discuss
Comments

Question 1

Why the below code snippet provides error?

C++ 
#include <iostream>
using namespace std;

int main() {

    int arr[3][2] ={{1,2,3},{4,5,6},{7,8,9}};
     for(int i=0;i<3;i++)
       for(int j=0;j<3;j++)
         cout<<arr[i][j]<<endl;
    return 0;
}

  • arr[i][j] is is not declared

  • there are no any braces used inside for loop

  • We have declared an array of 3 rows and 2 columns, but assigned value to 3 rows and 3 columns.

  • None

Question 2

What is the size of int arr[15]; if we assume that int is 4 bytes?

  • 15

  • 11

  • 12

  • 60

Question 3

When does the ArrayIndexOutOfBoundsException occur?

  • Compile time

  • Run time

  • Not an Exception

  • None

Question 4

The first Index of the array typically starts from -----

  • -1

  • 1

  • 0

  • None

Question 5

When the array has free unused memory, which method can be used to free up the extra memory?

  • free()

  • shrinkSize()

  • growSize()

  • None

Question 6

Which method is used to access elements in an array?

  • Sequential

  • Random

  • Logarithmic

  • Alternative

Question 7

What is the time complexity for inserting/deleting at the beginning of the array?

  • O(1)

  • O(logN)

  • O(NlogN)

  • O(N)

Question 8

What will do the below code snippet?

C++ 
#include <iostream>
using namespace std;

int main()
{
    int m = 3, n = 4, c = 0;

    int* arr = new int[m * n];

    for (int i = 0; i < m; i++) {
        for (int j = 0; j < n; j++) {

            *(arr + i * n + j) = ++c;
        }
    }

    return 0;
}

  • It will create a 1d array and assign value to it.

  • It will create a 1d array of size m*n and assign value to it.

  • It will create a 1d dynamic array and assign value to it.

  • It will create a dynamic 2d array and assign value to it.

Question 9

In C++, we can create a dynamic array using the ______keyword.

  • array

  • this

  • super

  • new

Question 10

How can we create a dynamic array in C?

  • vector( )

  • dynamic_array( )

  • malloc()

  • None

There are 30 questions to complete.

Take a part in the ongoing discussion