Static vs dynamic arrays in Data Structures Theory - Quick Revision & Key Differences

Recall & Review

beginner

What is a static array?

A static array is a collection of elements with a fixed size that is set when the array is created. Its size cannot be changed later.

beginner

What is a dynamic array?

A dynamic array is a collection of elements that can grow or shrink in size during the program's execution, allowing flexible storage.

intermediate

How does a static array store data compared to a dynamic array?

A static array stores data in a fixed block of memory, while a dynamic array may allocate new memory and copy data when resizing.

beginner

Name one advantage of static arrays.

Static arrays are simple and fast because their size is fixed, so memory is allocated once and access is quick.

beginner

Why might you choose a dynamic array over a static array?

You choose a dynamic array when you need to store a changing number of elements because it can resize automatically.

Which type of array has a fixed size that cannot change after creation?

A Static array

B Dynamic array

C Linked list

D Hash table

Static arrays have a fixed size set at creation and cannot be resized.

What happens when a dynamic array runs out of space?

A It throws an error

B It deletes old elements

C It stops accepting new elements

D It allocates a larger block of memory and copies existing elements

Dynamic arrays allocate more memory and copy elements to allow growth.

Which array type generally uses less memory when the number of elements is known and fixed?

A Dynamic array

B Neither uses memory

C Static array

D Both use the same memory

Static arrays allocate exactly the needed memory once, so they use less overhead.

Which array type is better when you need to add or remove elements frequently?

A Dynamic array

B Static array

C Neither

D Both are equally good

Dynamic arrays can resize, making them better for frequent changes.

What is a common disadvantage of dynamic arrays compared to static arrays?

A Cannot store numbers

B Slower access to elements

C Fixed size

D No memory allocation

Dynamic arrays may be slower due to resizing and copying operations.

Explain the main differences between static and dynamic arrays.

Think about size flexibility and memory use.

Describe a situation where a dynamic array is more useful than a static array.

Consider programs where data size is unknown or changes.