C++ Linked list issues with strings -

i'm quite new c++ , trying insert phone number , name inside of linked list user can set.i'm wondering i'm going wrong, i've been watching video after video using integers in linked lists , not strings.

so if main taken out program shows (0)errors , (0)warnings think problem in main.

so in main i'm trying cin nam(which have inside function part of set_first). i've tried passing address think i'm pulling @ straws that.

so question is: can point me in right direction, or let me know how put name , phone number node user specifies?

here's programs far descending main:

#include <iostream> #include <cstdlib> #include "l_list_1.h"  using namespace std;  int main() {     l_list_1 obr;      std::string nam;     cout << "name";     cin >> nam;     obr.set_first(nam); //i'm trying give nam since that's have inside set_first function.    return 0; } 

my header file looks this:

#ifndef l_list_1_h #define l_list_1_h   class l_list_1 { public:     l_list_1();     void set_first(std::string nam, int phnum);     void delete_node(std::string del_nams, int num_del);     void display();     char menu();   private:     typedef struct node {         std::string user_name;         int user_phone;         node* next;     }* nodeptr;      nodeptr head;     nodeptr curr;     nodeptr tail;     nodeptr temp; };  #endif // l_list_1_h 

and cpp file here:

#include <iostream> #include <cstdlib> #include <string> #include "l_list_1.h"  using namespace std;   l_list_1::l_list_1() {     head = null;     curr = null;     tail = null; }  void l_list_1::set_first(std::string nam, int phnum) {     nodeptr n = new node;     n->next = null;     n->user_name = nam;     n->user_phone = phnum;      cout << "name";     cin >> nam;      if (head != null) {         curr = head;         while (curr->next != null) {             curr = curr->next;         }         curr->next = n; }     else {         head = n;     } }  void l_list_1::delete_node(std::string del_nams, int num_del){     nodeptr delptr = null;     temp = head;     curr = head;     while(curr != null && curr->user_name != del_nams && curr->user_phone != num_del){         temp = curr;         curr = curr->next;     }     if(curr == null){         cout << del_nams << "was not in list";         cout << num_del << "was not in list";         delete delptr;     } else{         delptr = curr;         curr = curr-> next;         temp->next = curr;         delete delptr;         cout << "the item" << del_nams << "was deleted";         cout << "the item" << num_del << "was deleted";     } }  void l_list_1::display(){     curr = head;     while(curr != null){         cout << curr->user_name;         cout << curr->user_phone << endl;         curr = curr->next;     } } 

for starters member function set_first declared 2 parameters

void set_first(std::string nam, int phnum); 

however call 1 argument

obr.set_first(nam);  

in function (and in second function deletes nodes) not set tail of list.

also not clear these statements in function

cout << "name"; cin >> nam; 

you should remove them.

and there no sense declare following data members

nodeptr curr; nodeptr temp; 

instead of them use local variables in methods.

take account should include header <string>

#include <string> 

and not see header <cstdlib> used in program. may remove header.