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Circular double linked list implementation
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Circular double linked list implementation
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#include<stdio.h>
#include<stdlib.h>
struct node
{
struct node *prev;
struct node *next;
int data;
};
struct node *head;
void display();
void search();
void insertion_beginning();
void insertion_last();
void deletion_beginning();
void deletion_last();
//Driver Code
int main ()
{
int choice =0;
while(choice != 9)
{
printf("\n*********Main Menu*********\n");
printf("\nChoose the option to perform Following operation\n");
printf("\n---------------------------------------------------\n");
printf("\n1.Search\n2.Show\n3.Insert in Beginning\n4.Insert at last\n5.Delete from Beginning\n6.Delete from last\n7.Exit\n");
printf("\nEnter your choice?\n");
scanf("\n%d",&choice);
switch(choice)
{
case 1:
search();
break;
case 2:
display();
break;
case 3:
insertion_beginning();
break;
case 4:
insertion_last();
break;
case 5:
display();
break;
case 6:
deletion_last();
break;
case 7:
exit(0);
break;
default:
printf("Please options available");
}
}
}
// Display all elments in the linked list
void display()
{
struct node *ptr;
ptr=head;
if(head == NULL)
{
printf("\nUnderflow");
}
else
{
printf("\n The Values are as follows \n");
while(ptr -> next != head)
{
printf("%d\n", ptr -> data);
ptr = ptr -> next;
}
printf("%d\n", ptr -> data);
}
}
// Search a specific elements in the entered lists
void search()
{
struct node *ptr;
int item,i=0,flag=1;
ptr = head;
if(ptr == NULL)
{
printf("\nEmpty List\n");
}
else
{
printf("\nEnter item which you want to search?\n");
scanf("%d",&item);
if(head ->data == item)
{
printf("item found at the location %d",i+1);
flag=0;
}
else
{
while (ptr->next != head)
{
if(ptr->data == item)
{
printf("item found at the location %d ",i+1);
flag=0;
break;
}
else
{
flag=1;
}
i++;
ptr = ptr -> next;
}
}
if(flag != 0)
{
printf("Item not found\n");
}
}
}
// helps tp inseet elements in the begining
void insertion_beginning()
{
struct node *ptr,*temp;
int item;
ptr = (struct node *)malloc(sizeof(struct node));
if(ptr == NULL)
{
printf("\nOVERFLOW");
}
else
{
printf("\nEnter Item value");
scanf("%d",&item);
ptr->data=item;
if(head==NULL)
{
head = ptr;
ptr -> next = head;
ptr -> prev = head;
}
else
{
temp = head;
while(temp -> next != head)
{
temp = temp -> next;
}
temp -> next = ptr;
ptr -> prev = temp;
head -> prev = ptr;
ptr -> next = head;
head = ptr;
}
printf("\nNode Successfully inserted\n");
}
//Insertion at the last of the linked lists
}
void insertion_last()
{
struct node *ptr,*temp;
int item;
ptr = (struct node *) malloc(sizeof(struct node));
if(ptr == NULL)
{
printf("\nOVERFLOW");
}
else
{
printf("\nEnter value");
scanf("%d",&item);
ptr->data=item;
if(head == NULL)
{
head = ptr;
ptr -> next = head;
ptr -> prev = head;
}
else
{
temp = head;
while(temp->next !=head)
{
temp = temp->next;
}
temp->next = ptr;
ptr ->prev=temp;
head -> prev = ptr;
ptr -> next = head;
}
}
printf("\nnode successfully inserted\n");
}
//deletion of the first element in using Doubly Circular linked lists
void deletion_beginning()
{
struct node *temp;
if(head == NULL)
{
printf("\n UNDERFLOW");
}
else if(head->next == head)
{
head = NULL;
free(head);
printf("\nnode deleted successfully\n");
}
else
{
temp = head;
while(temp -> next != head)
{
temp = temp -> next;
}
temp -> next = head -> next;
head -> next -> prev = temp;
free(head);
head = temp -> next;
}
}
//deletion at last
void deletion_last()
{
struct node *ptr;
if(head == NULL)
{
printf("\n UNDERFLOW");
}
else if(head->next == head)
{
head = NULL;
free(head);
printf("\nnode deleted successfully\n");
}
else
{
ptr = head;
if(ptr->next != head)
{
ptr = ptr -> next;
}
ptr -> prev -> next = head;
head -> prev = ptr -> prev;
free(ptr);
printf("\nnode deleted successfully\n");
}
}