What is Stack data structure
A stack is a Linear data structure, used to store the data effectively and efficiently.
It follows Last in First Out(LIFO). Elements are inserted and deleted from top of an stack.
Let us consider a example of dishes.Here we add the dishes from the top i.e. considered as push and we remove the dishes from the top i.e considered as push
Stack stores different type of the Elements such as strings,integers etc.
It provides different operations or methods to work with stack
Stack can be implemented using Array or LinkedList
Stack Operations
Stack contains following basic operations
push: Adds an element to an Stackpop: Removes an element from an stacktop: Returns the top element of an stackisEmpty: true, if stack is empty, false if stack is not emptysize: Returns the size of an elements
Stack vs Queue
| Stack | Queue |
|---|---|
| Last In First Out | First In First Out |
| Linear Data structure | Linear Data structure |
| Add and delete elements from top of an list | Add and delete elements from both sides. Adds an elements to rear list, Delete an element from Front of an list |
| Add an element to Stack called Push | Add an element to Queue called Enqueue |
| Removes an element from a stack called Pop | Removes an element is called Dequeue |
| Recursion used for Data storage | sequential processing for data process |
