Implement Doubly Linked List
using Singly Linked List
#include
#include
struct node
{
int num;
struct node *next;
};
void create(struct node **);
void move (struct node *);
void release(struct node **);
void display(struct node *);
int main()
{
struct node *p = NULL, *q = NULL;
int result, count;
printf("Enter data into the list\n");
create(&p);
printf("Displaying list:\n");
display(p);
move(p);
release (&p);
return 0;
}
void move(struct node *head)
{
struct node *p, *q;
int ch;
p = q = head;
printf("\nPointer at %d\n", head->num);
do
{
printf("Select option:\n1. Move front\n2. Move back\n3. Exit\nYour choice: ");
scanf("%d", &ch);
switch(ch)
{
case 1: if(q->next != NULL)
{
q = q->next;
printf("\nPointer at %d\n", q->num);
}
else
{
printf("\nPointer at last node %d. Cannot move ahead.\n", q->num);
}
break;
case 2: while (p->next != q)
{
p = p->next;
}
if (p == q)
{
printf("\nPointer at first node %d. Cannot move behind.\n", q->num);
}
else
{
q = p;
p = head;
printf("\nPointer at %d\n", q->num);
}
break;
case 3: return;
default: printf("\nInvalid choice entered. Try again\n");
}
} while (1);
}
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));
temp->num = c;
temp->next = NULL;
if (*head == NULL)
{
*head = temp;
}
else
{
rear->next = temp;
}
rear = temp;
printf("Do you wish to continue [1/0]: ");
scanf("%d", &ch);
} while (ch != 0);
printf("\n");
}
void display(struct node *head)
{
while (head != NULL)
{
printf("%d\t", head->num);
head = head->next;
}
printf("\n");
}
void release(struct node **head)
{
struct node *temp;
while ((*head) != NULL)
{
temp = *head;
(*head) = (*head)->next;
free(temp);
}
}
Output
Enter data into the list
Enter number: 2
Do you wish to continue [1/0]: 1
Enter number: 4
Do you wish to continue [1/0]: 1
Enter number: 6
Do you wish to continue [1/0]: 1
Enter number: 8
Do you wish to continue [1/0]: 1
Enter number: 10
Do you wish to continue [1/0]: 0
Displaying list:
2 4 6 8 10
Pointer at 2
Select option:
1. Move front
2. Move back
3. Exit
Your choice: 1
Pointer at 4
Select option:
1. Move front
2. Move back
3. Exit
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