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Top MCQs on Array Data Structure with Answers
Question 1
A program P reads in 500 integers in the range [0..100] representing the scores of 500 students. It then prints the frequency of each score above 50. What would be the best way for P to store the frequencies?
An array of 50 numbers
An array of 100 numbers
An array of 500 numbers
A dynamically allocated array of 550 numbers
Question 2
Consider the below program. What is the expected output?
void fun(int arr[], int start, int end)
{
while (start < end) {
int temp = arr[start];
arr[start] = arr[end];
arr[end] = temp;
start++;
end--;
}
}
swapping the elements pairwise
sorting the elements
Reverse an array
None
Question 3
Refer the below diagram and identify the problem.
Normal traversal of the matrix.
Row-wise traversal of the matrix.
Column-wise traversal of the matrix.
spiral traversal of the matrix.
Question 4
Fill in the blanks for completing the program to rotate an array by d elements.
/*Function to left rotate arr[] of size n by d*/
void Rotate(int arr[], int d, int n)
{
int p = 1;
while (_______) {
int last = arr[0];
for (int i = 0; ______ i++) {
arr[i] = arr[i + 1];
}
__________
p++;
}
}
p <= d , i < n - 1 , arr[n - 1] = last;
p < d, i < n, arr[n] = last;
p >=d, i >n , arr[n] = last
None
Question 5
Consider the below program, and what is doing this program basically?
#include <bits/stdc++.h>
using namespace std;
void print(char a[], int n, int ind)
{
for (int i = ind; i < n + ind; i++)
cout << a[(i % n)] << " ";
}
int main()
{
char a[] = { 'A', 'B', 'C', 'D', 'E', 'F' };
int n = sizeof(a) / sizeof(a[0]);
print(a, n, 3);
return 0;
}
It is printing the normal array
It is printing circular array rotated by 3
Syntax error
None
Question 6
Which of the following is the limitation of the array?
elements can be accessed from anywhere.
The size of the array is fixed.
Indexing is started from Zero.
Memory waste if an array's elements are smaller than the size allotted to them
Question 7
What will do the following code?
void fun(int arr[], int n)
{
for (int i = 0; i < n; i++) {
for (int j = i; j < n; j++) {
for (int k = i; k <= j; k++)
cout << arr[k] << " ";
cout << endl;
}
}
}
Prints the subsequence of the article.
Prints the elements of the array
Prints the subarray of the element.
None
Question 8
Let A be a matrix of size n x n. Consider the following program. What is the expected output?
void fun(int A[][N])
{
for (int i = 0; i < N; i++)
for (int j = i + 1; j < N; j++)
swap(A[i][j], A[j][i]);
}
Matrix A
Diagonal Of matrix A
Transpose of matrix A
None
Question 9
What is the correct way to call the function (fun) in the below program?
#include <bits/stdc++.h>
#include <iostream>
using namespace std;
void fun(char* arr)
{
int i;
unsigned int n = strlen(arr);
for (i = 0; i < n; i++)
cout << " " << arr[i];
}
// Driver program
int main()
{
char arr[]
= { 'g', 'e', 'e', 'k', 's', 'q', 'u', 'i', 'z' };
// How to call the above function here to print the char
// elements?
return 0;
}
fun(&arr);
fun(*arr);
fun(arr)
None
Question 10
What will the output of the below code, be if the base address of the array is 1200?
#include <iostream>
using namespace std;
int main()
{
int arr[] = { 1, 2, 3, 4, 5 };
cout << arr << ", " << &arr << ", " << &arr[0] << endl;
return 0;
}
1200, 1202, 1204
1200 1200 1200
1200, 1204, 1208
1200, 1204, 1208
There are 20 questions to complete.