Data Structures Quiz

Which of the following is an abstract data type?

• int

• array

• stack

• pointer

What does malloc() return if it fails to allocate memory?

• -1

• NULL

• 0

• void

Which of the following allocates dynamic memory in C?

• new

• malloc

• alloc

• alloc_mem

What is the correct way to allocate memory for an integer array of 5 elements?

• int *arr = malloc(5);

• int *arr = malloc(sizeof(int) * 5);

• int arr[5];

• int arr = malloc(5);

Which scenario best explains the use of pointers?

• To swap values in a function

• To print output

• To increase array size

• To declare constants

Why is dynamic memory allocation important?

• Prevents function calls

• Helps define memory at runtime

• Improves syntax

• Supports all data types

Which part of memory is used by dynamically allocated memory?

• Stack

• Heap

• Code

• Data

Which of the following data structures allows random access?

• Linked List

• Stack

• Queue

• Array

Which structure consumes more memory, array or linked list?

• Array

• Linked List

• Both equal

• Depends on size

What connects the elements in a linked list?

• Index

• Pointer

• Key

• Address