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.

```
/*
```

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

```
 */
```
```
 
```
```
#include <stdio.h>
```
```
#include <stdlib.h>
```
```
 
```
```
struct node
```
```
{
```
```
    int num;
```
```
    struct node *next;
```
```
    struct node *prev;
```
```
};
```
```
 
```
```
void create(struct node **);
```
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int max(struct node *);
```
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void release(struct node **);
```
```
 
```
```
int main()
```
```
{
```
```
    struct node *p = NULL;
```
```
    int n;
```
```
 
```

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

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

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

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

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