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Create Program to Print Middle Element of a Linked List

View: 507    Dowload: 0   Comment: 0   Post by: hanhga   Category: Php&mySql   Fields: Other

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;
};
 
struct node* head;
 
void insert_node(int data){
 
    /* Creating a new node */
    struct node* newnode=(struct node*)malloc(sizeof(struct node*));
    newnode->data = data;
    newnode->next = head;
 
    head = newnode;
}
 
void middleelement(){
 
   /* Take two pointers first and second */
    struct node *first,*second;
    first=second = head;
 
    if(head!=NULL){
 
      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()
{
 
  head = NULL;
 
  insert_node(2);
  insert_node(4);
  insert_node(6);
  insert_node(8);
  insert_node(9);
 
  middleelement();
 
}

Create Program to Print Middle Element of a Linked List

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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