c++ - 数据结构：我得到了不想要的价值

Question

我花了很多时间来理解这个问题。我不知道为什么会出现。也许你们可以找出并理解这个问题。我写了必要的评论。这是我的代码：

        #include <iostream>
        struct node{
    ////I am creating node structure.
            int number;
            node *next;
            node *previous;
        };
        struct list{
////I am creating list structure.It has head and tail pointers
            node *head;
            node *tail;
            void add(node *);  //  Add function
            void create();  //  Create function
            void deleteList();  //  Delete function.
        }emrah;
        using namespace std;
        int main(){
            emrah.create();  //  a list called 'emrah' has been created.
            cout<<"Type 1."<<endl;  //  So that we lead user to add a node.
            int selection;
            cin>>selection;
            if (selection==1){  //  Suppose user typed 1.
                node x;//  new node is x.
                emrah.add(&x);  //  x has been sent.
                cout<<x.number;  //  Problem is here.On the command line,it shows like -9231
            }
        }
        void list::create(){  //  Create function.It has no problem.
            head=NULL;
            tail=NULL;
        }
        void list::add(node *Node){  //  I think problem is around this function.
            Node=new node;
            cout<<"Sayi gir"<<endl;
            cin>>Node->number;
            cout<<Node->number;
            head=tail=Node;
        }

我得到的 x 值与我在命令行上键入的值不同。我错过的点在哪里？谢谢。

Answer 1

此外，您Node使用接收用户输入的新对象覆盖参数。x从来没有被触及过list::add。