从节点中删除数据

#include <conio.h>
#include <iostream>
#include <string>
using namespace std;
class MysticalBag
{
private:
    int useCount;
    int content;
    string itemName;
public:
    MysticalBag *next_ptr;
    void setAttributes()
    {
        //Called for showing the items without any placement of item
        useCount = 1;
        content = 5;
        itemName = "Healing Potion";
    }
    int takeUseCount()
    {
        return useCount;
    }
    int takeContent()
    {
        return content;
    }
    string takeItemName()
    {
        return itemName;
    }
    void setAttributes(int userCount, int content, string itemName)
    {
        this->useCount = useCount;
        this->content = content;
        this->itemName = itemName;
    }
    void itemAdder()
    {
        cout << "Enter use count (1-3) " <<endl;
        cin >> useCount;
        cout << "Enter content (1.0 - 100.0) " <<endl;
        cin >> content;
        cout << "Enter item name as text" << endl;
        cin >> itemName;
        cout<< itemName <<" is added in the bag."<< endl;
    }
    void showBag()
    {
        cout << "Showing bag contents" << endl << endl;
        cout << itemName << endl;
        cout << "U - "<< useCount <<", C - "<< content << endl;
    }
};

int main()
{
    char choice1,choice2;
    choice1 = 0;
    MysticalBag *head, *tail, *navigator;
    navigator = new MysticalBag();
    navigator->setAttributes();
    head = navigator;
    tail = navigator;
    tail->next_ptr = NULL;
    while(choice1 !='x')
    {
        cout << "What do you want to do with the bag?" << endl;
        cout << "(a)dd item" << endl;
        cout << "(r)emove item" << endl;
        cout << "(s)how items" <<endl;
        cout << "e(x)it" <<endl;
        cin >> choice1;
        if(choice1 == 'a')
        {
            navigator = new MysticalBag();
            if(head==NULL)
            {
                head=navigator;
                tail=navigator;
                tail->next_ptr=NULL;
            }
            navigator->itemAdder();
            tail->next_ptr = navigator;
            tail = navigator;
            tail->next_ptr = NULL;
        }
        else if(choice1 == 'r')
        {
            navigator = head;
            tail = head;
            while(navigator->next_ptr != NULL)
                {
                    navigator = navigator->next_ptr;
                    tail = navigator;
                }
            cout << "Do you want to remove "<< navigator->takeItemName() <<" from your bag? (y/n)"<< endl;
            cin >> choice2;
            if(choice2 == 'y')
            {
                navigator = head;
                if(navigator == head)
                //I am stuck at this point!
                navigator = NULL;
            cout << "Item removed." << endl;
            tail = head;
            while(tail->next_ptr != NULL)
                {
                    tail = tail->next_ptr;
                }
            }
            else
            {
                cout<< "No item removed" <<endl;
            }
            navigator = head;
            if(navigator == head && navigator == tail)
            {
                navigator = NULL;
                head = NULL;
                tail = NULL;
            }
            else
            {
                navigator = tail;
                navigator = NULL;
                tail = NULL;
                tail = head;
                while(tail->next_ptr != NULL)
                {
                    tail = tail->next_ptr;
                }
            }
        }
        else if(choice1 != 'x')
        {
            navigator = head;
            while(navigator != NULL)
            {
                navigator->showBag();
                navigator = navigator->next_ptr;
            }
        }
    }
    getch();
}

我的目标是从节点中删除数据。用户可以将数据放入节点，即导航器。

我想的是将导航器指向头部和使头部回忆 setAttributes((。这将显示"治疗药水"。但是，如果用户添加到项目。如何一次只删除一个项目？