Quiz on C++ Arrays

Welcome to the C++ Arrays Quiz! This extensive quiz covers a wide range of topics from basic to advance related to arrays in C++. Each question comes with a clear explanation, helping you understand not just the correct answer but why it's correct. Test your knowledge and strengthen your understanding of how arrays work, from basic declarations to advanced manipulations.

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Question 1

What is an array in C++?

  • A collection of elements of different types

  • A collection of elements of the same type

  • A collection of functions

  • None of the above

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Question 2

How do you declare an array of integers with 5 elements in C++?

  • int array[5];

  • array int[5];

  • int[5] array;

  • array[5] int;

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Question 3

What will be the output of the following code?

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

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

  • 1

  • 2

  • 3

  • 4

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Question 4

Which of the following correctly initializes an array of 3 integers to 0?

  • int arr[3] = {};

  • int arr[3] = {0, 0, 0};

  • int arr[3] = {0};

  • All of the above

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Question 5

What is the size of the array char arr[] = "geeksforgeeks";?

  • 12

  • 13

  • 15

  • 14

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Question 6

What is the index of the last element in an array int arr[20];?

  • 20

  • 19

  • 21

  • 18

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Question 7

How do you pass an array to a function in C++?

  • By copying

  • By value

  • By pointer

  • By name

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Question 8

What will be the output of the following C++ code?

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

int main() {
    int arr[3] = {1, 2};
    for(int i = 0; i < 3; i++)
        cout << arr[i] << " ";
    return 0;
}

  • 1 2 3

  • 1 2 1

  • 1 2 0

  • Compilation error

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Question 9

What will be the output of the following code?

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

void modifyArray(int arr[], int size) {
    for(int i = 0; i < size; i++) {
        arr[i] += 5;
    }
}

int main() {
    int arr[3] = {1, 2, 3};
    modifyArray(arr, 3);
    for(int i = 0; i < 3; i++) {
        cout << arr[i] << " ";
    }
    return 0;
}

  • 1 2 3

  • 6 7 8

  • 1 7 3

  • Compilation error

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Question 10

Which of the following are true about multidimensional arrays in C++?

  • They are arrays of arrays

  • The syntax to declare a 2D array is type arrayName[rows][columns];

  • They can have two or more dimensions

  • All of the above

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There are 30 questions to complete.

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