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Count Number of Nodes in a Linked List using PHP

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Write a method or program to count the number of nodes in a linked list.

Introduction

How to Count Number of Nodes in a Linked List

i) Take a count variable and initialize it to zero, count = 0.

ii) Traverse a linked list and increment a count variable.

iii) When a node point to null then return the count.

void print(){
 
    /* temp pointer points to head. */
 
    struct node* temp = head;
 
    /* Initialize count variable . */
 
    int count=0;
 
    /* Traverse the linked list and maintain the count. */
 
    while(temp!=NULL){
 
       temp = temp->next;
 
        /* Increment count variable. */
        count++;
 
    }
 
     /* Print the total count. */
 
    printf("\n Total no. of nodes is %d",count);
 
}

Program to Count Number of Nodes in a Linked List

#include <stdio.h>
 
struct node{
 
    int data;
    struct node* next;
};
 
struct node* head;
 
void insert(int data){
 
    /* Allocate memory*/
    struct node* temp = (struct node*)malloc(sizeof(struct node));
 
    temp->data = data;
    temp->next = head;
 
    head = temp;
 
}
 
void print(){
 
    struct node* temp = head;
 
    int count=0;
 
    /* Traverse the linked list and maintain the count. */
 
    while(temp != NULL){
 
       temp = temp->next;
       count++;
 
    }
 
    printf("\n Total no. of nodes is %d",count);
 
}
 
void main(){
 
    head = NULL;
 
    insert(2);
    insert(4);
 
    /* calling print function to print the count of node. */
    print();
 
}

Time complexity is O(n).

Count Number of Nodes in a Linked List using PHP

Count Number of Nodes in a Linked List using PHP Posted on 04-10-2016  Write a method or program to count the number of nodes in a linked list. 9/10 105

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