Problem with traversing doubly link list

[Skhiburdhurs]

so here's the thing, i have no problem traversing at both forward and backward but not simultaneously. i can traverse forward, and traverse again forward with no problem. i can also traverse backward and traverse backward again with no problem (take note this is by not exiting the program). without exiting the program, with the same datas inputed, if i traversed forward, i cannot traverse backward (it only gives me infinite loop of the first data) and vice versa. i hope you can help me

  #include <iostream>

using namespace std;

struct Node
{
    int data;
    Node *next;
    Node *prev;
};

int main()
{
    int choice,linksize;
    Node *head,*temp,*ptr,*tail;
    head=NULL;
    temp=head;
    tail=head;
    do
    {
        cout<<"Options"<<endl;
        cout<<"1.)Create"<<endl;
        cout<<"2.)Display"<<endl;
        cout<<"3.)Reverse"<<endl;
        cout<<"4.)Exit"<<endl;
        cout<<"option: ";
        cin>>choice;
        if(choice==1)
        {
            cout<<"\tHow many would you like to create?: ";
            cin>>linksize;
            for(int x=0;x<linksize;x++)
            {
                if(x==0)
                {
                    ptr=new Node;
                    ptr->next=NULL;
                    ptr->prev=NULL;
                    cout<<"\tEnter Data: ";
                    cin>>ptr->data;
                    head=ptr;
                    temp=ptr;
                }
                else if(x>0&&x!=linksize-1)
                {
                    ptr=new Node;
                    ptr->next=NULL;
                    ptr->prev=temp;
                    cout<<"\tEnter Data: ";
                    cin>>ptr->data;
                    temp->next=ptr;
                    temp=temp->next;
                }
                else if(x==linksize-1)
                {
                    cout<<"\tThis is the last NODE!"<<endl;
                    ptr=new Node;
                    ptr->next=NULL;
                    ptr->prev=temp;
                    cout<<"\tEnter Data: ";
                    cin>>ptr->data;
                    temp->next=ptr;
                    temp=temp->next;
                    tail=temp;
                    cout<<"\t"<<tail->prev<<endl;

                }
            }
        }
        else if(choice==2)
        {
            cout<<"Previous\tData(Current)\tNext"<<endl;
            temp=head;
            while(temp!=NULL)
            {
                cout<<temp->prev<<"\t"<<temp->data<<"("<<temp<<")"<<"\t"<<temp->next<<endl;
                temp->prev=temp;
                temp=temp->next;
            }
        }

        else if(choice==3)
        {
            cout<<"Previous\tData(Current)\tNext"<<endl;
            temp=tail;
            while(temp!=NULL)
            {
                cout<<temp->prev<<"\t"<<temp->data<<"("<<temp<<")"<<"\t"<<temp->next<<endl;
                temp->next=temp;
                temp=temp->prev;
            }
        }
    }while(choice!=4);

    return 0;
}

[SIK]

remove lines 77 and 89

[Skhiburdhurs]

Wow thanks, that actually works!