Test: Arrays - 2

# Test: Arrays - 2 - Software Development

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## 20 Questions MCQ Test Basics of C++ - Test: Arrays - 2

Test: Arrays - 2 for Software Development 2023 is part of Basics of C++ preparation. The Test: Arrays - 2 questions and answers have been prepared according to the Software Development exam syllabus.The Test: Arrays - 2 MCQs are made for Software Development 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Arrays - 2 below.
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Test: Arrays - 2 - Question 1

### What is the index of the first element in an array?

Detailed Solution for Test: Arrays - 2 - Question 1

In C++, the index of the first element in an array is always 0.

Test: Arrays - 2 - Question 2

### What is the maximum number of elements an array can hold in C++?

Detailed Solution for Test: Arrays - 2 - Question 2

The maximum number of elements an array can hold in C++ depends on various factors such as the implementation, system limitations, and available memory.

Test: Arrays - 2 - Question 3

### How can you access the nth element in an array?

Detailed Solution for Test: Arrays - 2 - Question 3

The index of the nth element in an array is (n-1), as array indices start from 0 in C++.

Test: Arrays - 2 - Question 4

Which of the following statements about multi-dimensional arrays is true?

Detailed Solution for Test: Arrays - 2 - Question 4

Multi-dimensional arrays in C++ are represented as a linear sequence of elements in memory. They can have different sizes for each dimension.

Test: Arrays - 2 - Question 5

What is the default value assigned to uninitialized elements in an array?

Detailed Solution for Test: Arrays - 2 - Question 5

Uninitialized elements in an array have undefined values and can contain garbage values.

Test: Arrays - 2 - Question 6

Which of the following is true regarding arrays in C++?

Detailed Solution for Test: Arrays - 2 - Question 6

Arrays in C++ have a fixed size once declared. Their size cannot be changed dynamically during runtime.

Test: Arrays - 2 - Question 7

What is the memory layout of elements in a 2D array?

Detailed Solution for Test: Arrays - 2 - Question 7

Elements in a 2D array are stored in a column-wise manner. The elements of each column are stored adjacent to each other in memory.

Test: Arrays - 2 - Question 8

What is the size of an array in bytes?

Detailed Solution for Test: Arrays - 2 - Question 8

The size of an array in bytes depends on the data type of the elements and the number of elements in the array. It can be calculated using the formula sizeof(array).

Test: Arrays - 2 - Question 9

What is the output of the following code snippet?
#include <iostream>
using namespace std;

int main() {
int arr = {1, 2, 3, 4, 5};
cout << arr << endl;
return 0;
}

Detailed Solution for Test: Arrays - 2 - Question 9

The code declares an integer array 'arr' with 5 elements and initializes them with values 1, 2, 3, 4, and 5. The statement 'cout << arr << endl;' prints the value at index 3, which is 4.

Test: Arrays - 2 - Question 10

What is the output of the following code snippet?
#include <iostream>
using namespace std;

int main() {
int arr[] = {1, 2, 3, 4, 5};
cout << arr << endl;
return 0;
}

Detailed Solution for Test: Arrays - 2 - Question 10

The code declares an integer array 'arr' with 5 elements and initializes them with values 1, 2, 3, 4, and 5. The statement 'cout << arr << endl;' tries to access an element at index 10, which is beyond the array's size. It will result in undefined behavior and may print a garbage value.

Test: Arrays - 2 - Question 11

What is the output of the following code snippet?
#include <iostream>
using namespace std;

int main() {
int arr;
cout << arr << endl;
return 0;
}

Detailed Solution for Test: Arrays - 2 - Question 11

The code declares an integer array 'arr' with 5 elements but does not initialize them. In C++, uninitialized elements in an array are set to 0 by default. The statement 'cout << arr << endl;' prints the value at index 0, which is 0.

Test: Arrays - 2 - Question 12

What is the output of the following code snippet?
#include <iostream>
using namespace std;

int main() {
int arr = {1, 2, 3, 4, 5};
cout << arr << endl;
return 0;
}

Detailed Solution for Test: Arrays - 2 - Question 12

The code declares an integer array 'arr' with 5 elements and initializes the first three elements with values 1, 2, and 3. The remaining two elements are not explicitly initialized and will contain garbage values. The statement 'cout << arr << endl;' prints the value at index 4, which may be a garbage value.

Test: Arrays - 2 - Question 13

What is the output of the following code snippet?
#include <iostream>
using namespace std;

int main() {
int arr = {1, 2, 3, 4, 5};
cout << arr << endl;
return 0;
}

Detailed Solution for Test: Arrays - 2 - Question 13

The code declares an integer array 'arr' with 5 elements and prints the value of 'arr'. In C++, when an array name is used in an expression, it decays into a pointer to its first element. Therefore, 'cout << arr << endl;' prints the memory address of the first element in the array.

Test: Arrays - 2 - Question 14

What is the output of the following code snippet?
#include <iostream>
using namespace std;

int main() {
int arr = {1, 2, 3, 4, 5};
cout << sizeof(arr) << endl;
return 0;
}

Detailed Solution for Test: Arrays - 2 - Question 14

The code declares an integer array 'arr' with 5 elements. The 'sizeof(arr)' returns the size of the entire array in bytes, which is equal to the number of elements (5) multiplied by the size of each element (4 bytes for an integer). Therefore, 'cout << sizeof(arr) << endl;' prints 20.

Test: Arrays - 2 - Question 15

What is the output of the following code snippet?
#include <iostream>
using namespace std;

int main() {
int arr = {1, 2, 3, 4, 5};
cout << sizeof(arr) / sizeof(arr) << endl;
return 0;
}

Detailed Solution for Test: Arrays - 2 - Question 15

The code declares an integer array 'arr' with 5 elements. The 'sizeof(arr)' returns the size of the entire array in bytes, and 'sizeof(arr)' returns the size of each element in bytes. Therefore, 'cout << sizeof(arr) / sizeof(arr) << endl;' prints the number of elements in the array, which is 5.

Test: Arrays - 2 - Question 16

Which sorting algorithm has the worst-case time complexity of O(n^2)?

Detailed Solution for Test: Arrays - 2 - Question 16

Bubble Sort has a worst-case time complexity of O(n^2) when the array is reverse sorted. It involves repeatedly swapping adjacent elements if they are in the wrong order.

Test: Arrays - 2 - Question 17

Which sorting algorithm can be implemented using a recursive approach?

Detailed Solution for Test: Arrays - 2 - Question 17

Merge Sort can be implemented using a recursive approach. It divides the array into two halves, recursively sorts them, and then merges the sorted halves.

Test: Arrays - 2 - Question 18

What is the output of the following code snippet?
#include <iostream>
using namespace std;

void swap(int& a, int& b) {
int temp = a;
a = b;
b = temp;
}

void bubbleSort(int arr[], int n) {
for (int i = 0; i < n - 1; i++) {
for (int j = 0; j < n - i - 1; j++) {
if (arr[j] > arr[j + 1]) {
swap(arr[j], arr[j + 1]);
}
}
}
}

int main() {
int arr[] = {5, 2, 4, 6, 1, 3};
int n = sizeof(arr) / sizeof(arr);
bubbleSort(arr, n);
cout << arr << endl;
return 0;
}

Detailed Solution for Test: Arrays - 2 - Question 18

The code implements the Bubble Sort algorithm to sort the array 'arr' in ascending order. After sorting, the value at index 3 will be 3. Therefore, 'cout << arr << endl;' prints 3.

Test: Arrays - 2 - Question 19

Which sorting algorithm has the best average-case time complexity?

Detailed Solution for Test: Arrays - 2 - Question 19

Merge Sort has an average-case time complexity of O(n log n), which is the best among the given sorting algorithms. It recursively divides the array into halves and merges them in a sorted manner.

Test: Arrays - 2 - Question 20

Which sorting algorithm is known for its simplicity and suitability for small input sizes?

Detailed Solution for Test: Arrays - 2 - Question 20

Insertion Sort is known for its simplicity and suitability for small input sizes. It works by gradually building a sorted portion of the array and inserting elements in the correct order.

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## Basics of C++

70 videos|45 docs|15 tests