Answer Posted / splurgeop

// assumin all things are given function to delete
from beginning.....



int delete_from_beg()
{
int el;
if(head==NULL)
{
printf("\n can't delete ");
return -1;
}
else
{
struct doubly *temp;
temp=head;
el=temp->info;
head=temp->next;
temp->next=NULL;
head->prev=NULL;
return el;
}

}



//delete from end


int delete_from_end()
{
int el;
if(head==NULL)
{
printf("\n can't delete");
return -1;
}
else
{
struct doubly *temp;
temp=head;
while(temp->next!=NULL)
temp=temp->next;
el=temp->info;
if(temp==head)
head=NULL;
else
temp->prev->next=NULL;
return el;
}
}




// delete from any position



int delete_at_pos(int item)
{
int el,flag=0;
struct doubly *temp;
if(head==NULL)
{
printf("\n cant delete ");
return -1;
}
else
{
temp=head;
while(item>1)
{
item--;
temp=temp->next;
if(temp==NULL&& item>=1)
{
flag=1;
break;
}
}
if(flag==1)
{
el=-1;
printf("\n cant delete at the specified
location");
}
else
{
if(temp==head)
{
el=temp->info;
head=temp->next;
}
else
{
struct doubly *t;
t=temp;
el=temp->info;
temp->prev->next=t->next;
temp->next->prev=t->prev;
}

}
}
return el;
}




// where doubly is structure

struct doubly
{
int data;
struct doubly *prev,*next;
};

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