1.
Introduction
2.
What is a Stack Data Structure?
3.
What is a Queue Data Structure?
4.
Difference between Stack and Queue Data structure
5.
5.1.
What are stacks and queues called?
5.2.
Why is queue called FIFO?
5.3.
What kind of data can we store in the stack?
5.4.
What are the types of queues?
6.
Conclusion
Last Updated: Jul 12, 2024
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# Difference Between Stack And Queue Data Structures

Ayush Tiwari
0 upvote

## Introduction

Both stack and queue are linear data structures used for storing and managing collections of elements. They allow access and removal of elements based on specific rules.

Difference: A stack follows the Last In, First Out (LIFO) principle, whereas a queue follows the First In, First Out (FIFO) principle.

This blog will discuss the various differences between the stacks and the queue data structures by understanding both stack and queue and then comparing both Data Structures. At last, we will understand the practical application of stack and queue individually. So, let's get started!

## What is a Stack Data Structure?

Stack is a special type of ADT also known as Abstract data type, which is known to store and remove elements from one side of the list only, that side is known as â€˜TOPâ€™. â€˜Last in first outâ€™, commonly known as â€˜LIFOâ€™ is the order which is followed by the stack. In the stack, we canâ€™t access any element as we can access the array, We can only access that element that is on the top of the stack. A pointer is used to keep the track of the â€˜topâ€™ element of the stack.

Condition to Check if Stack is Empty

``````int Empty()
{
if(top==-1)
return 1;
else return 0;
}``````

Condition to Check if Stack is Full

``````int Full()
{
if(top==MAX-1)
return 1;
else
return 0;
}``````

## What is a Queue Data Structure?

A queue is a special type of ADT also known as Abstract data type, which is known to store elements from one side knowns as â€˜rearâ€™ and remove elements from the other side known as â€˜frontâ€™. â€˜First in First Outâ€™, commonly known as â€˜FIFOâ€™ is the order which is followed by the queue. In the queue, we canâ€™t access any element as we can access in the array, we can only access the front element of the stack and push the element in the â€˜rearâ€™. A pointer is used to keep the track of the â€˜frontâ€™ element of the stack and the â€˜rearâ€™ of the stack.

Let us understand the condition to check if the queue is empty or full

Condition to Check if Queue is Empty

``````int Empty()
{
if(front==-1 || front==rear+1)
return 1;
else
return 0;
}``````

Condition to Check if Queue is Full

``````int Full()
{
if(rear==MAX-1)
return 1;
else
return 0;
}The pointers``````

## Difference between Stack and Queue Data structure

Must Readhash function in data structure

### What are stacks and queues called?

Stacks and queues are called linear data structures. A stack follows Last In, First Out (LIFO) order, where the last element added is the first to be removed. A queue follows First In, First Out (FIFO) order.

### Why is queue called FIFO?

A queue is called FIFO (First In, First Out) because the first element added to the queue is the first one to be removed. This ensures that elements are processed in the order they arrive.

### What kind of data can we store in the stack?

We can store homogeneous data of any data type.

### What are the types of queues?

There are three types of queues which are as follows:-

• Simple Queue
• Double Ended Queue
• Circular Queue

## Conclusion

In this article, we discussed the differences between the stack and queue data structures.

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