Build Stack Data Structure Implementation using Linked List

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Write a program to implement a stack using linked list. In my last post, I have explained the implementation of a stack data structure using an array. In this post, I’ll explain how to implement a stack  data structure using linked list.

Stack Data Structure

Let’s revise some of the terminologies of a stack.

i) Stack worked on LIFO (Last In First Out) Principle. It means insertion and deletion are allowed only at one end. The element which added last must be the first element to be removed.

ii) In Stack, Insertion operation is called Push and deletion operation is called Pop . During push operation if memory is not available then it’s termed as StackOverflow. During pop operation if a stack is empty, then it’s called StackUnderflow

Program to Implement Stack using Linked List

I assumed you have a basic understand of linked list. If you are not familiar with linked list data structure then check my previous posts on linked list.

#include <stdio.h>
#include <stdlib.h>
 
/* Create a node which contains data and next pointer link */
 
struct node{
 
 int data;
 struct node *link;
};
 
struct node *head;
 
void push(int data){
 
        /* Allocate memory */
 
 struct node *newNode = (struct node*)malloc(sizeof(struct node));
 
 /* If memory is full */
 
 if (newNode == NULL) {
 
   printf("Stack Overflow \n");
   return;
 
 }
 
 /* Create new node */
 
 newNode->data = data;
 newNode->link = head;
 
 head = newNode;
 
}
 
void pop() {
 
 /* If there is no element to pop */
 
 if(head == NULL) {
 
   printf("Stack Underflow");
   exit(0);
 
 }
 
 struct node *p = head;
 
         int data;
 data = p->data;
 
 /* Points to next link */
 
 head = head->link;
 free(p);
 
 printf("Popped element is %d\n",data);
}
 
main() {
 
       /*Initially head is assigned null. */
 
 head = NULL;
 
 push(4);
 push(6);
 pop();
 push(8);
 pop();
 
}

Output

Popped element is 6
Popped element is 8

Explanation

In this program first, we pushed element 4 and 6 in a stack. Stack worked on LIFO(Last In First Out) principle. Then a pop method is called, so 6 is popped out. Again we push element 8 and then we called a pop method which popped 8 from a stack.

Build Stack Data Structure Implementation using Linked List

Build Stack Data Structure Implementation using Linked List Posted on 05-10-2016  Write a program to implement a stack using linked list. In my last post, I have explained the implementation of a stack data structure using an array. In this post, I’ll explain how to implement a stack data structure using linked list. 5/10 267

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