Mastering C Arrays and Memory

What is the size of an array in C if it is declared as int arr[10];?

• 20 bytes

• 10 bytes

• 40 bytes

• 80 bytes

How do you access the third element of an array named 'data'?

• data[1]

• data[2]

• data[3]

• data[-1]

What will be the output of the following code: int arr[] = {1, 2, 3}; printf('%d', arr[1]);?

• 4

• 3

• 1

• 2

Explain how memory is allocated for arrays in C.

• Memory for arrays in C is allocated randomly in non-contiguous blocks.

• Memory for arrays in C is allocated in a single block on the stack only.

• Arrays in C are allocated only on the heap regardless of their size.

• Memory for arrays in C is allocated in contiguous blocks, either on the stack or heap, based on the total size calculated from the number of elements and their size.

What is the difference between a static array and a dynamic array?

• The main difference is that static arrays have a fixed size, while dynamic arrays can change size during execution.

• Static arrays can grow in size during execution.

• Dynamic arrays have a fixed size and cannot change.

• Static arrays are more memory efficient than dynamic arrays.

How do you declare a two-dimensional array in C?

• array[3][4] int;

• int array(3,4);

• int array[3][4];

• int[4][3] array;

What will happen if you try to access an array element out of its bounds?

• The program will crash immediately.

• The array will automatically resize to accommodate the access.

• An error or undefined value will be returned.

• The last element of the array will be returned.

Write a code snippet to initialize an array with the first five even numbers.

• [0, 2, 4, 6, 8]

• [0, 1, 2, 3, 4]

• [2, 4, 6, 8, 10]

• [1, 3, 5, 7, 9]

What is the output of the following code: int arr[5] = {0}; printf('%d', arr[4]);?

• 0

• 1

• -1

• 5

How can you find the length of an array in C?

• The length of an array can be found by counting its elements manually.

• The length of an array in C can be found using sizeof(arr) / sizeof(arr[0]).

• Use the length() function to get the size of the array.

• You can find the length by using arr.length.