Create Program to Print Middle Element of a Linked List

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Write a program to print middle element of a linked list. It is also the most asked question in interviews.  I assume you have a basic understanding of linked list and it’s concept.

First Method:

i) Traverse a linked list and maintain the count of nodes.

ii) After traversing a linked list we know it’s length. In a second traversal, traverse the linked list by count/2 and print the last element(count/2). We get the middle element of a linked list.

The above method works good. But you can solve this problem in one pass, by using two pointers.

Second Method:

i) Take two pointers. Move the first pointer by one and second pointer by two.

ii) When the second pointer reaches at the end of a linked list. The first pointer points to the middle element of a linked list.

Program to Print Middle Element of a Linked List

```#include <stdio.h>
struct node{
int data;
struct node* next;
};

void insert_node(int data){

/* Creating a new node */
struct node* newnode=(struct node*)malloc(sizeof(struct node*));
newnode->data = data;

}

void middleelement(){

/* Take two pointers first and second */
struct node *first,*second;

while(second!=NULL && second->next!=NULL){

/* Move first by one and second by two step */
second = second->next->next;
first=first->next;
}

/* Print value of first node which points to middle */
printf("Middle element is %d",first->data);
}

}

main()
{

insert_node(2);
insert_node(4);
insert_node(6);
insert_node(8);
insert_node(9);

middleelement();

}```

Write a program to print middle element of a linked list. It is also the most asked question in interviews. I assume you have a basic understanding of linked list and it’s concept.

Posted on 06-10-2016

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