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#include <iostream>
#include <stdlib.h>
using namespace std;
int opcion;
struct nodo{
string info;
string name;
nodo *next;
nodo *prev;
};
void AddtoEnd(nodo **head, nodo **last);
void AddtoStart(nodo **head, nodo **last);
void AddtoStart2(nodo **head, nodo **last);
void AddAfter(nodo **head, nodo **last); //despuesde
void AddBefore(nodo **head, nodo **last);
void show(nodo *head);
void showx(nodo *last);
void EliminarFinal(nodo **head, nodo **last);
void AddAfter(nodo **head, nodo **last);
int main()
{
nodo *c=NULL,*f=NULL; //head pointer and last/end pointer
AddtoStart(&c, &f);
AddtoStart(&c, &f);
AddtoStart(&c, &f);
show(c);
AddAfter(&c, &f);
AddAfter(&c, &f);
show(c);
}
void AddtoStart(nodo **head, nodo **last){
nodo *A;
string name;
cout<<"Add name to Start"<<endl;
cin>>name;
if((*head)==NULL){
*head = new nodo;//
(*head)->info =name; //
(*head)->next=NULL;//
(*head)->prev=NULL;
(*last)=(*head); //
}
else{
A = new nodo;
A->info = name;
A->next = *head;
(*head) = A;
}
}
void AddtoStart2(nodo **head, nodo **last){
//nodo *A;
nodo *B;
string name;
cout<<"Add name to Star(no last pointer)"<<endl;
cin>>name;
if((*head)==NULL){
*head = new nodo;//assing nodo direction to head
(*head)->info =name; //store name in nodo
(*head)->next=NULL; //
(*last)=(*head); // start and end are the same
}
else{
B = new nodo;
B->info = name;
B->next = *head;
B->prev = NULL;
(*head) = B;
}
}
void AddAfter(nodo **head, nodo **last){
int position, i=2;
string name;
nodo *A,*B;
A=new nodo;
B=NULL;
cout<<"\nAdd name (after): ";
cin>>name;
A->info=name;
A->next=NULL;
A->prev=NULL;
cout<<"Add name after position #: ";
cin>>position;
if(position==1){
if((head)==NULL){
(*head)=A;
(*last)=A;
}
else {
A->next=(*head)->next;
A->prev=(*head);
(*head)->next->prev=A;
(*head)->next=A;
}
}
else
{
B=*head;
while (i<=position){
B=B->next;
i++;
}
A->next=B->next;
A->prev=B;
B->next->prev=A;
B->next=A;
}
}
void show(nodo *head)
{
cout<<"Elements in the list"<<endl;
nodo* temp;
temp=head;
while (temp!= NULL)
{
cout<<temp->info<<" ";
temp=temp->next;
}
}
void showx(nodo *last)
{
cout<<"Elements in the list"<<endl;
nodo* temp;
temp=last;
while (temp!= NULL)
{
cout<<temp->info<<" ";
temp=temp->prev;
}
}
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