Program to find average of all nodes in a Linked List

Given a singly linked list. The task is to find the average of all nodes of the given singly linked list.

Examples:

Input: 7->6->8->4->1
Output: 26
Average of nodes:
(7 + 6 + 8 + 4 + 1 ) / 5 = 5.2

Input: 1->7->3->9->11->5
Output: 6

Iterative Solution:



  1. Initialise a pointer ptr with the head of the linked list and a sum variable with 0.
  2. Start traversing the linked list using a loop until all the nodes get traversed.
  3. Add the value of current node to the sum i.e. sum += ptr -> data .
  4. Increment the pointer to the next node of linked list i.e. ptr = ptr ->next .
  5. Divide sum by total number of node and Return the average.

Below is the implementation of the above approach:

C++

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// C++ implementation to find the average of
// nodes of the Linked List
  
#include <bits/stdc++.h>
using namespace std;
  
/* A Linked list node */
struct Node {
    int data;
    struct Node* next;
};
  
// function to insert a node at the
// beginning of the linked list
void push(struct Node** head_ref, int new_data)
{
    /* allocate node */
    struct Node* new_node = new Node;
  
    /* put in the data */
    new_node->data = new_data;
  
    /* link the old list to the new node */
    new_node->next = (*head_ref);
  
    /* move the head to point to the new node */
    (*head_ref) = new_node;
}
  
// Function to iteratively find the avg of
// nodes of the given linked list
float avgOfNodes(struct Node* head)
{
    // if head = NULL
    if (!head)
        return -1;
  
    int count = 0; // Initialize count
    int sum = 0;
    float avg = 0.0;
  
    struct Node* current = head; // Initialize current
    while (current != NULL) {
        count++;
        sum += current->data;
        current = current->next;
    }
  
    // calculate average
    avg = (double)sum / count;
  
    return avg;
}
  
// Driver Code
int main()
{
    struct Node* head = NULL;
  
    // create linked list 7->6->8->4->1
    push(&head, 7);
    push(&head, 6);
    push(&head, 8);
    push(&head, 4);
    push(&head, 1);
  
    cout << "Average of nodes = " << avgOfNodes(head);
  
    return 0;
}

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Java

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// Java implementation to find the average of
// nodes of the Linked List
class GFG
      
/* A Linked list node */
static class Node 
{
    int data;
    Node next;
};
  
// function to insert a node at the
// beginning of the linked list
static Node push(Node head_ref, int new_data)
{
    /* allocate node */
    Node new_node = new Node();
  
    /* put in the data */
    new_node.data = new_data;
  
    /* link the old list to the new node */
    new_node.next = (head_ref);
  
    /* move the head to point to the new node */
    (head_ref) = new_node;
    return head_ref;
}
  
// Function to iteratively find the avg of
// nodes of the given linked list
static double avgOfNodes(Node head)
{
    // if head = null
    if (head == null)
        return -1;
  
    int count = 0; // Initialize count
    int sum = 0;
    double avg = 0.0;
  
    Node current = head; // Initialize current
    while (current != null)
    {
        count++;
        sum += current.data;
        current = current.next;
    }
  
    // calculate average
    avg = (double)sum / count;
  
    return avg;
}
  
// Driver Code
public static void main(String args[])
{
    Node head = null;
  
    // create linked list 7.6.8.4.1
    head=push(head, 7);
    head=push(head, 6);
    head=push(head, 8);
    head=push(head, 4);
    head=push(head, 1);
  
    System.out.println("Average of nodes = " + avgOfNodes(head));
}
}
// This code is contributed by Arnab Kundu

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C#

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// C# implementation to find the average 
// of nodes of the Linked List 
using System;
  
class GFG 
      
/* A Linked list node */
public class Node 
    public int data; 
    public Node next; 
}; 
  
// function to insert a node at the 
// beginning of the linked list 
static Node push(Node head_ref, 
                 int new_data) 
    /* allocate node */
    Node new_node = new Node(); 
  
    /* put in the data */
    new_node.data = new_data; 
  
    /* link the old list to the new node */
    new_node.next = (head_ref); 
  
    /* move the head to point to the new node */
    (head_ref) = new_node; 
    return head_ref; 
  
// Function to iteratively find the avg of 
// nodes of the given linked list 
static double avgOfNodes(Node head) 
    // if head = null 
    if (head == null
        return -1; 
  
    int count = 0; // Initialize count 
    int sum = 0; 
    double avg = 0.0; 
  
    Node current = head; // Initialize current 
    while (current != null
    
        count++; 
        sum += current.data; 
        current = current.next; 
    
  
    // calculate average 
    avg = (double)sum / count; 
  
    return avg; 
  
// Driver Code 
public static void Main(String []args) 
    Node head = null
  
    // create linked list 7.6.8.4.1 
    head=push(head, 7); 
    head=push(head, 6); 
    head=push(head, 8); 
    head=push(head, 4); 
    head=push(head, 1); 
  
    Console.WriteLine("Average of nodes = "
                           avgOfNodes(head)); 
  
// This code is contributed by Rajput-Ji

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Output:

Average of nodes = 5.2

Time complexity : O(n)
Where n is equal to number of nodes.



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