![]() ![]() We also keep track of the size and capacity of the stack. In linked list implementation, a stack is a pointer to the head of the list where pushing and popping items happens, with perhaps a counter to keep track of the listâs size. We can easily implement a stack through a linked list. Which is exactly what we did and hence accomplished to make a Linked List behave as a Stack. We keep a LinkedList pointer to point to the top of the stack and keep its track. In this post, a linked list implementation of the stack is discussed. ![]() So for any data structure to act as a Stack, it should have push() method to add data on top and pop() method to remove data from top. When we say "implementing Stack using Linked List", we mean how we can make a Linked List behave like a Stack, after all they are all logical entities. In this, we simply return the data stored in the head of the list. In order to do this, we will simply delete the first node, and make the second node, the head of the list. Removing Element from Stack (Linked List) Now whenever we will call the push() function a new node will get added to our list in the front, which is exactly how a stack behaves. In order to insert an element into the stack, we will create a node and place it in front of the list. The advantage of using a linked list over arrays is that it is possible to implement a stack that can grow or shrink as much as needed. Node *front // points to the head of list In linked list implementation, a stack is a pointer to the head of the list where pushing and popping items happens, with perhaps a counter to keep track of the listâs size. Then we define our stack class, class Stack pop (): Return the top element of the Stack i.e simply delete the first element from the linked list. This is our Linked list node class which will have data in it and a node pointer to store the address of the next node element. push (): Insert a new element into the stack i.e just insert a new element at the beginning of the linked list. In this way our Linked list will virtually become a Stack with push() and pop() methods.įirst we create a class node. To achieve stack like behaviour, you always add new elements to the head of the list (push) and only allow the first element to be removed from the list (pop). A linked list is an easy structure for implementing a stack. ![]() Data is removed from the stack with the Pop. Data is added to a stack with the Push method. In other words, inserts the element at the front of this list. This would for example allow you to reuse the list in order to construct the stack class. The primary operations you perform with a stack are Push and Pop. ![]() With Linked list, the push operation can be replaced by the addAtFront() method of linked list and pop operation can be replaced by a function which deletes the front node of the linked list. push(E e) method pushes an element onto the stack represented by this list. Stack is a data structure to which a data can be added using the push() method and data can be removed from it using the pop() method. Stacks can be easily implemented using a linked list. Implementation of Stack using Linked List
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