## Applications of Stack | Applications of Stack in Data Structure

Almost all application, software, and website uses the stack for many purposes. In the field of information technology (in a data structure) and in real life also application of stack plays a vital role.
Contents In Page

- 1. What is stack
- 2. What are pop and push
- 3. Application of stack video
- 4. Applications of stack
- - Convert and Evaluation of expression
- - Perform Undo sequence
- - Keeps visited history
- - In recursion
- - Tree Traversals
- - Check the correctness of the parentheses sequence
- - In Data structure
- - As an auxiliary data structure

## What is a Stack?

A stack is a linear data structure in which an element may be inserted or deleted only at one end called the top of the stack. Stack uses a variable called top which indicates the topmost element in the order stack. Applications of Stack is the main topic that we are going to read very clearly.## What is push and pop in the stack?

Inserting element in the stack is called pushing known as push () operation. Deleting an element from the stack is called popping known as pop() operation. A stack is used in the data structure.

## The application of Stack

The application of stack are given described below### 1. To convert and evaluate expressions (postfix, prefix & infix).

#### a. Application of Stacks in Conversions

Stack has an important role in the conversions of postfix and prefix expression. The characters of the infix are scanned and proceed for stack operation. If the scanned character is an operator and if the stack is empty, the operator is stored in stack otherwise precedence of an operator is compared to the operator in stack and proceeds to output expression. The process of postfix and prefix conversion is also taken place in the same way but it has a single stack that contains the converted substring and finally the converted expression.#### b. Application of Stacks in Evaluation

Prefix and postfix expression can be evaluated faster than the infix expression. Evaluation of expressions like infix, postfix, and prefix can be done by scanning one-character from the left (in postfix) and from the right (in the prefix). The set of the first popped elements to the first operand is evaluated and the result then transferred to the stack but in infix expression, the precedence of the operator and brackets rule should be followed.### 2. To perform the Undo Sequence.

The undo sequence is created by keeping all recent changes in stack. While pushing a change in stack previous change is blocked by the recent change and recent change will stay at the top of the stack. When we use undo, we call the pop operation which removes the recent change which stays at the top of the stack and utilizes in the program. Now, that the previous change comes at the top of the stack and the sequence runs in the same order. Undo sequence is considered to be the most important application of stack in all kinds of software and websites.### 3. To keep the page visited history in Web browsers.

As the stack is a data structure and can be used to count the entry by saving each entry in memory. When the user entered a website the number of entry elements increases by 1 i.e. entry element=entry element+1. That the increment will be stored in the database. Every time the users enter a website the entry element increases and finally shows the overall visits on websites.### 4. Uses of the stack in recursion.

If you know about recursion then just think where the recursion function stores its previous results, Obviously in the stack. The recursive function may go to an uncountable loop and for the next step, it needs the previous result. It seems like breaking the complete process into many subprocesses and solve one after another. To give the final solution it also uses the stack, it merges all solutions from the stack.### 5. Application of Stack in Tree Traversals.

We know that tree traversal is a process to pass form all the nodes of a tree. In a tree every element cannot be accessed directly, it needs a process ie. tree traversal. This process starts from the root of the tree to the nodes with the help of edges. It uses the recursive method to pass from one node to another node. So, the stack is very useful in tree traversals.