C Exercises: Find maximum value from a doubly linked list
C Doubly Linked List : Exercise-11 with Solution
Write a program in C to find the maximum value in a doubly linked list.
Pictorial Presentation:

Sample Solution:
C Code:
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
struct node {
int num;
struct node * preptr;
struct node * nextptr;
}*stnode, *ennode;
void DlListcreation(int n);
int getMaxNode(struct node *stnode);
void displayDlList();
int main()
{
int n;
stnode = NULL;
ennode = NULL;
printf("\n\n Doubly Linked List : Find maximum value from a doubly linked list :\n");
printf("--------------------------------------------------------------------------\n");
printf(" Input the number of nodes : ");
scanf("%d", &n);
DlListcreation(n);
displayDlList();
printf("\n The Maximum Value in the Linked List : %d\n\n", getMaxNode(stnode));
return 0;
}
void DlListcreation(int n)
{
int i, num;
struct node *fnNode;
if(n >= 1)
{
stnode = (struct node *)malloc(sizeof(struct node));
if(stnode != NULL)
{
printf(" Input data for node 1 : "); // assigning data in the first node
scanf("%d", &num);
stnode->num = num;
stnode->preptr = NULL;
stnode->nextptr = NULL;
ennode = stnode;
// putting data for rest of the nodes
for(i=2; i<=n; i++)
{
fnNode = (struct node *)malloc(sizeof(struct node));
if(fnNode != NULL)
{
printf(" Input data for node %d : ", i);
scanf("%d", &num);
fnNode->num = num;
fnNode->preptr = ennode; // new node is linking with the previous node
fnNode->nextptr = NULL;
ennode->nextptr = fnNode; // previous node is linking with the new node
ennode = fnNode; // assign new node as last node
}
else
{
printf(" Memory can not be allocated.");
break;
}
}
}
else
{
printf(" Memory can not be allocated.");
}
}
}
int getMaxNode(struct node *stnode)
{
if(stnode == NULL){
printf(" User message : Invalid Input !!!!\n");
return INT_MIN;
}
int max = stnode->num;
while(stnode != NULL){
if(stnode->num > max){
max = stnode->num;
}
stnode = stnode->nextptr;
}
return max;
}
void displayDlList()
{
struct node * tmp;
int n = 1;
if(stnode == NULL)
{
printf(" No data found in the List yet.");
}
else
{
tmp = stnode;
printf("\n\n Data entered in the list are :\n");
while(tmp != NULL)
{
printf(" node %d : %d\n", n, tmp->num);
n++;
tmp = tmp->nextptr; // current pointer moves to the next node
}
}
}
Sample Output:
Doubly Linked List : Find maximum value from a doubly linked list : -------------------------------------------------------------------------- Input the number of nodes : 3 Input data for node 1 : 5 Input data for node 2 : 9 Input data for node 3 : 1 Data entered in the list are : node 1 : 5 node 2 : 9 node 3 : 1 The Maximum Value in the Linked List : 9
Flowchart:

DlListcreation() :

getMaxNode() :

displayDlList() :

C Programming Code Editor:
Previous: Write a program in C to delete a node from middle of a doubly linked list.
Next: Write a program in C to create and display a circular linked list.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
- Weekly Trends
- Python Interview Questions and Answers: Comprehensive Guide
- Scala Exercises, Practice, Solution
- Kotlin Exercises practice with solution
- MongoDB Exercises, Practice, Solution
- SQL Exercises, Practice, Solution - JOINS
- Java Basic Programming Exercises
- SQL Subqueries
- Adventureworks Database Exercises
- C# Sharp Basic Exercises
- SQL COUNT() with distinct
- JavaScript String Exercises
- JavaScript HTML Form Validation
- Java Collection Exercises
- SQL COUNT() function
- SQL Inner Join