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Arrays Interview Questions

MCQ Question 1 of 10

Question 1: Array Declaration

Which of the following is the correct way to declare an integer array of size 10 in C?

int arr(10);int arr[10];int arr{10};array int arr[10];

Question 2: Array Indexing

If int arr[5]; is declared, what are the valid indices?

1 to 50 to 40 to 5-1 to 4

Question 3: Array Initialization

Which of the following correctly initializes an array in C?

int arr[3] = {1, 2, 3};int arr[] = {1, 2, 3};Both A and BNone

Question 4: Accessing Array Elements

What will the following code print?

#include <stdio.h>

int main() {
    int arr[3] = {10, 20, 30};
    printf("%d", arr[1]);
    return 0;
}

102030Garbage Value

Question 5: Array and Loop

What will be printed?

#include <stdio.h>

int main() {
    int arr[4] = {2, 4, 6, 8};
    for (int i = 0; i < 4; i++) {
        printf("%d ", arr[i]);
    }
    return 0;
}

2 4 6 80 1 2 3Garbage valuesCompilation error

Question 6: Array Out of Bounds

What happens if we try to access arr[10] when arr has size 5?

Gives 0Compilation errorRuntime error (undefined behavior)Always prints garbage

Question 7: 2D Array Size

How many elements does an array int arr[3][4]; contain?

71234

Question 8: 2D Array Access

What will be printed?

#include <stdio.h>

int main() {
    int arr[2][2] = {{1, 2}, {3, 4}};
    printf("%d", arr[1][0]);
    return 0;
}

1234

Question 9: Strings as Arrays

Which of the following is the correct declaration of a string in C?

char str[] = "Hello";char str[6] = "Hello";Both A and Bint str[] = "Hello";

Question 10: Sizeof Operator

If int arr[10]; and sizeof(int) = 4, what will sizeof(arr) return?

10440Undefined