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Quiz on C++ Arrays

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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;
}

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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";?

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Question 6

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

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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;
}