delete fist and last node in double link list

// Dobly Link List DELETE First

#include

#include

using namespace std;

struct node

{

int info;

node *plink,*flink;

}*head=NULL,*tail=NULL,*nptr,*ptr;

void insert()

{

nptr=new node;

int item;

cout<<"Enter the Value";

cin>>item;

nptr->info=item;

if (head==NULL)

{

head=nptr;

tail=nptr;

nptr->plink=NULL;

nptr->flink=NULL;

}

else

{

ptr=head;

nptr->flink=ptr;

nptr->plink=NULL;

ptr->plink=nptr;

head=nptr;

}

}

void deletef()

{

ptr=head;

head=ptr->flink;

head->plink=NULL;

}

void traverse()

{

ptr=head;

while(ptr!=NULL)

{

cout<info<<endl;

ptr=ptr->flink;

}

}

int main()

{

int n,i;

cout<<"Enter the no of element you want to enter";

cin>>n;

for(i=1;i<=n;i++)

{

insert();

}

deletef();

traverse();

}

======================================================================

// Dobly Link List DELETE Last

#include

#include

using namespace std;

struct node

{

int info;

node *plink,*flink;

}*head=NULL,*tail=NULL,*nptr,*ptr;

insert()

{

nptr=new node;

int item;

cout<<"Enter the Value";

cin>>item;

nptr->info=item;

if (head==NULL)

{

head=nptr;

tail=nptr;

nptr->plink=NULL;

nptr->flink=NULL;

}

else

{

ptr=head;

nptr->flink=ptr;

nptr->plink=NULL;

ptr->plink=nptr;

head=nptr;

}

}

deletel()

{

ptr=tail;

tail=ptr->plink;

tail->flink=NULL;

}

traverse()

{

ptr=head;

while(ptr!=NULL)

{

cout<info<<endl;

ptr=ptr->flink;

}

}

int main()

{

int n,i;

cout<<"Enter the no of element you want to enter";

cin>>n;

for(i=1;i<=n;i++)

{

insert();

}

deletel();

traverse();

}