C Program to Find the Largest Element in a Doubly Linked List

This C Program finds the largest element in a doubly linked list.

Here is a source code of the C Program that finds the largest in a doubly linked list. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

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/*
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 * C Program to Find the Largest Element in a Doubly Linked List

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 */
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```
 
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#include <stdio.h>
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#include <stdlib.h>
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```
 
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```
struct node
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{
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    int num;
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    struct node *next;
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    struct node *prev;
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};
```
```
 
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void create(struct node **);
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int max(struct node *);
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void release(struct node **);
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```
 
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int main()
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```
{
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    struct node *p = NULL;
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    int n;
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```
 
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    printf("Enter data into the list\n");

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    create(&p);
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    n = max(p);
```

    printf("The maximum number entered in the list is %d.\n", n);

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    release (&p);
```
```
 
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    return 0;
```
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}
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```
 
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int max(struct node *head)
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{
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    struct node *max, *q;
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    q = max = head;
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    while (q != NULL)
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    {
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        if (q->num > max->num)
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        {
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            max = q;
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        }
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        q = q->next;
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    }
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    return (max->num);
```
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}
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```
 
```
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void create(struct node **head)
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```
{
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    int c, ch;
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    struct node *temp, *rear;
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    do
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    {
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        printf("Enter number: ");
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        scanf("%d", &c);
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        temp = (struct node *)malloc(sizeof(struct node));

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        temp->num = c;
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        temp->next = NULL;
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        temp->prev = NULL;
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        if (*head == NULL)
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        {
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            *head = temp;
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        }
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        else
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```
        {
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            rear->next = temp;
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            temp->prev = rear;
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        }
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        rear = temp;
```

        printf("Do you wish to continue [1/0]: ");

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        scanf("%d", &ch);
```
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    } while (ch != 0);
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    printf("\n");
```
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}
```
```
 
```
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void release(struct node **head)
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```
{
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    struct node *temp = *head;
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    *head = (*head)->next;
```
```
    while ((*head) != NULL)
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```
    {
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        free(temp);
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        temp = *head;
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        (*head) = (*head)->next;
```
```
    }
```
```
}
```

$ cc largestdoubly.c 
$ ./a.out
Enter data into the list
Enter number: 12
Do you wish to continue [1/0]: 1
Enter number: 7
Do you wish to continue [1/0]: 1
Enter number: 23
Do you wish to continue [1/0]: 1
Enter number: 4
Do you wish to continue [1/0]: 1
Enter number: 1
Do you wish to continue [1/0]: 1
Enter number: 16
Do you wish to continue [1/0]: 0
 
The maximum number entered in the list is 23.