Array - Recap

How do you initialize an array in C?

• a) int arr[3] = (1,2,3);

• b) int arr(3) = {1,2,3};

• c) int arr[3] = {1,2,3};

• d) int arr(3) = (1,2,3);

What are the different ways to initialize an array with all elements as zero?

• a) int array[5] = {};

• b) int array[5] = {0};
  

• c)int a = 0, b = 0, c = 0;

    int array[5] = {a, b, c};

• d) All of the mentioned

. What are the elements present in the array of the following C code?

int array[5] = {5};

• a)5, 5, 5, 5, 5

• b) 5, 0, 0, 0, 0

• c) 5, (garbage), (garbage), (garbage), (garbage)

• d) (garbage), (garbage), (garbage), (garbage), 5

Which of the following C statements will calculate the correct size of an array of 10 integers?

(Assuming the declaration as int a[10];)

• a) sizeof(a[10]);

• b) sizeof(*a);

• c) sizeof(a);

• d) sizeof(&a);

What is the index of the last element in an array of size n in C?

•  n

• n+1

• n-1

• 0

What will be the output of the following code?

#include <stdio.h>

int main() {

int arr[] = {10, 20, 30, 40, 50};

printf("%d", *(arr + 2));

return 0;

}

• 10

• 30

• 50

• 20

Which of the following is not valid for accessing an array element?

• arr[i]

• *(arr + i)

• i[arr]

• arr * i

Which of the following is a valid declaration of a 3D array?

• int arr[5][5][5];

• int arr(5,5,5);

• int arr[5,5,5];

• int [5][5][5] arr;

Scenario: An online shopping app stores selected item prices in an array:
int cart[] = {150, 299, 450, 299, 199};
What will be the output of this code?
int total = 0;

for (int i = 0; i < 5; i++) {

if (cart[i] == 299) {

total++; }

}

• 0

• 5

• 1

• 2

Scenario: A library uses an array to store ISBNs in ascending order. To check if a book is present, binary search is used.
int isbn[] = {100, 200, 300, 400, 500};
Question: Which of the following inputs will make the binary search terminate in 1st comparison?

• 300

• 100

• 500

• 400