#include<iostream>
#include<cstdio>
#include<cstdlib>
using namespace std;
/*
* Node Declaration
*/
struct node
{
int info;
struct node *next;
struct node *prev;
}*start, *last;
int counter = 0;
/*
* Class Declaration
*/
class double_clist
{
public:
node *create_node(int);
void insert_begin();
void insert_last();
void insert_pos();
void delete_pos();
void search();
void update();
void display();
void reverse();
void sort();
double_clist()
{
start = NULL;
last = NULL;
}
};
int main()
{
int choice;
double_clist cdl;
while (1)
{
cout<<"\n-------------------------------"<<endl;
cout<<"Operations on Doubly Circular linked list"<<endl;
cout<<"\n-------------------------------"<<endl;
cout<<"1.Insert at Beginning"<<endl;
cout<<"2.Insert at Last"<<endl;
cout<<"3.Insert at Position"<<endl;
cout<<"4.Delete at Position"<<endl;
cout<<"5.Display List"<<endl;
cout<<"6.Exit"<<endl;
cout<<"Enter your choice : ";
cin>>choice;
switch(choice)
{
case 1:
cdl.insert_begin();
break;
case 2:
cdl.insert_last();
break;
case 3:
cdl.insert_pos();
break;
case 4:
cdl.delete_pos();
break;
case 5:
cdl.display();
break;
case 6:
exit(1);
default:
cout<<"Wrong choice"<<endl;
}
}
return 0;
}
node* double_clist::create_node(int value)
{
counter++;
struct node *temp;
temp = new(struct node);
temp->info = value;
temp->next = NULL;
temp->prev = NULL;
return temp;
}
/*
*INSERTS ELEMENT AT BEGINNING
*/
void double_clist::insert_begin()
{
int value;
cout<<endl<<"Enter the element to be inserted: ";
cin>>value;
struct node *temp;
temp = create_node(value);
if (start == last && start == NULL)
{
cout<<"Element inserted in empty list"<<endl;
start = last = temp;
start->next = last->next = NULL;
start->prev = last->prev = NULL;
}
else
{
temp->next = start;
start->prev = temp;
start = temp;
start->prev = last;
last->next = start;
cout<<"Element inserted"<<endl;
}
}
void double_clist::insert_last()
{
int value;
cout<<endl<<"Enter the element to be inserted: ";
cin>>value;
struct node *temp;
temp = create_node(value);
if (start == last && start == NULL)
{
cout<<"Element inserted in empty list"<<endl;
start = last = temp;
start->next = last->next = NULL;
start->prev = last->prev = NULL;
}
else
{
last->next = temp;
temp->prev = last;
last = temp;
start->prev = last;
last->next = start;
}
}
/*
*INSERTS ELEMENT AT POSITION
*/
void double_clist::insert_pos()
{
int value, pos, i;
cout<<endl<<"Enter the element to be inserted: ";
cin>>value;
cout<<endl<<"Enter the postion of element inserted: ";
cin>>pos;
struct node *temp, *s, *ptr;
temp = create_node(value);
if (start == last && start == NULL)
{
if (pos == 1)
{
start = last = temp;
start->next = last->next = NULL;
start->prev = last->prev = NULL;
}
else
{
cout<<"Position out of range"<<endl;
counter--;
return;
}
}
else
{
if (counter < pos)
{
cout<<"Position out of range"<<endl;
counter--;
return;
}
s = start;
for (i = 1;i <= counter;i++)
{
ptr = s;
s = s->next;
if (i == pos - 1)
{
ptr->next = temp;
temp->prev = ptr;
temp->next = s;
s->prev = temp;
cout<<"Element inserted"<<endl;
break;
}
}
}
}
/*
* Delete Node at Particular Position
*/
void double_clist::delete_pos()
{
int pos, i;
node *ptr, *s;
if (start == last && start == NULL)
{
cout<<"List is empty, nothing to delete"<<endl;
return;
}
cout<<endl<<"Enter the postion of element to be deleted: ";
cin>>pos;
if (counter < pos)
{
cout<<"Position out of range"<<endl;
return;
}
s = start;
if(pos == 1)
{
counter--;
last->next = s->next;
s->next->prev = last;
start = s->next;
free(s);
cout<<"Element Deleted"<<endl;
return;
}
for (i = 0;i < pos - 1;i++ )
{
s = s->next;
ptr = s->prev;
}
ptr->next = s->next;
s->next->prev = ptr;
if (pos == counter)
{
last = ptr;
}
counter--;
free(s);
cout<<"Element Deleted"<<endl;
}
/*
* Display Elements of the List
*/
void double_clist::display()
{
int i;
struct node *s;
if (start == last && start == NULL)
{
cout<<"The List is empty, nothing to display"<<endl;
return;
}
s = start;
for (i = 0;i < counter-1;i++)
{
cout<<s->info<<"<->";
s = s->next;
}
cout<<s->info<<endl;
}
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