c++ - Define String Node in Linked List -

#include<iostream> #include<stdlib.h> #include<conio.h> #include <ctime> #include <fstream> #include <windows.h> #include <string> using namespace std;   /* data variable used store data name  suggests,the "next" pointer of type node used point next node of  linked list*/ /* * node declaration */ struct node {   string info;   struct node *next; }*start;  /*  * class declaration */ class single_llist {   public:     node* create_node(string);     void insert_begin();     void insert_pos();     void insert_last();      void delete_pos();     void sort();     void search();     void update();     void reverse();     void display();     single_llist()      {         start = null;     } };  /* * inserting element in beginning */ void single_llist::insert_begin() {   string value;   cout<<"enter value inserted: ";   cin>>value;   struct node *temp, *p;   temp = create_node(value);   if (start == null)   {     start = temp;     start->next = null;             }    else   {     p = start;     start = temp;     start->next = p;   }   cout<<"element inserted @ beginning"<<endl; } 

i'm developing program dev c ++ program.i trying entering specific words txt file , save them.therefore i'm dealing string.the program gives error: undefined reference single_llist::create_node(std::string) , showing me there mistake here, temp = create_node(value);i still researching need solving problem?

thanks @nathanoliver think tried wrong way without creating node first.for creating node check following code fragment.

/* * creating node */ node *single_llist::create_node(string value) { struct node *temp, *s; temp = new(struct node);  if (temp == null) {     cout<<"memory not allocated "<<endl;     return 0; } else {     temp->info = value;     temp->next = null;          return temp; } }