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Arrays Interview Questions

MCQ Question 1 of 10

Question 1: C++ Array Declaration

Which of the following is the correct way to declare an integer array of size 5 in C++?

int arr[5];int[5] arr;array int arr(5);arr int[5];

Question 2: C++ Guess the Output – Array Initialization

What will be the output of the following code?

#include <iostream>
using namespace std;

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

03Garbage ValueError

Question 3: C++ Array Index

What will happen if you try to access arr[10] in an array declared as int arr[5];?

It will give an error at compile-time.It will cause undefined behavior at runtime.It will print 0.It will automatically resize the array.

Question 4: C++ Guess the Output – Array Elements

What will be the output of the following code?

#include <iostream>
using namespace std;

int main() {
    int arr[] = {10, 20, 30, 40};
    cout << arr[1] + arr[3];
    return 0;
}

30405060

Question 5: C++ Size of Array

If we declare int arr[10]; then what is sizeof(arr) (assuming int takes 4 bytes)?

102040Depends on compiler

Question 6: C++ Guess the Output – Array Traversal

What will be the output of the following code?

#include <iostream>
using namespace std;

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

1231 2 3ErrorGarbage Values

Question 7: C++ Multidimensional Array

How do you correctly declare a 2D array with 3 rows and 4 columns in C++?

int arr[3,4];int arr[3][4];int[3][4] arr;array arr[3][4];

Question 8: C++ Guess the Output – Multidimensional Array

What will be the output of the following code?

#include <iostream>
using namespace std;

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

1234

Question 9: C++ Array and Functions

When an array is passed to a function in C++, what is actually passed?

Entire array copyArray reference (pointer to first element)Array sizeNone of the above

Question 10: C++ Guess the Output – Array and Pointers

What will the following code print?

#include <iostream>
using namespace std;

int main() {
    int arr[] = {5, 10, 15};
    cout << *arr;
    return 0;
}

51015Error