have a problem with a linked list

I copied this program from the book for understanding and it doesn't work
phone.h

Code:

---

class phone{
public:
        char first_name[15],last_name[15];
        long number;
        phone *next;
        static int n;
        phone(const char *last,const char *first,long num);
        ~phone();
        void print();
};

---

phone.cpp

Code:

---

#include <iostream>
#include "phone.h"
#include <string>
#include <process.h>
#include <iomanip>
using namespace std;
int phone ::n;
phone::phone(const char *last,const char *first,long num)
{
        if(strlen(last)<15)
                strcpy(last_name,last);
        else
        {
                cout<<"Error! the last name is too long\n";
                exit(1);
        }
        if(strlen(first)<15)
                strcpy(first_name,first);
        else
        {
                cout<<"Error!the first name is too long\n";
                exit(1);
        }
        number=num;
        next=NULL;
        n++;
}
phone::~phone()
{
        cout<<"destructing phone number"<<n<<'\n';
        print();
        n--;
}
void phone::print()
{
        cout<<setw(15)<<last_name<<setw(15)<<first_name<<setw(15)<<number<<'\n';
}

---

list.h

Code:

---

#include "phone.h"
class list
{
        phone *head;
public:
        list(const char *last,const char *first,long num);
        ~list();
        void insert(phone *p);
        phone *find_place(const char *last);
        phone *find(const char *last);
        phone *find_last_place();
        int del(const char *last);
        void print();
};

---

list.cpp

Code:

---

#include <iostream>
#include <string>
#include "phone.h"
#include "list.h"
using namespace std;

list::list(const char *last,const char *first,long num)
{
        head=new phone(last,first,num);
}
phone *list::find_last_place()
{
        phone *tmp,*prev;
        for(tmp=head,prev=head;tmp->next;prev=tmp,tmp=tmp->next);
        return(prev);
}
phone *list::find(const char *last)
{
        phone *tmp,*prev;
        for(tmp=head,prev=head;tmp!=NULL;prev=tmp,tmp->next)
                if(strcmp(last,tmp->last_name)==0)
                        return(prev);
        return(prev);
}
phone *list::find_place(const char *last)
{
        phone *tmp,*prev;
        for(tmp=head,prev=head;tmp!=NULL;prev=tmp,tmp=tmp->next)
                if(strcmp(tmp->last_name,last)>=0)
                        return(prev);
        return(prev);
}
void list::insert(phone *p)
{
        phone *tmp;
        //p->last_name the smallest
        if(strcmp(p->last_name,head->last_name)<0)
        {
                tmp=head;
                head=p;
                p->next=tmp;
                return;
        }
        //other cases
        tmp=find_place(p->last_name);
        p->next=tmp->next;
        tmp->next=p;
}
void list::print()
{
        phone *tmp;
        for(tmp=head;tmp!=NULL;tmp=tmp->next)
                tmp->print();
        cout<<"Total number od Objects are"<<head->n<<'\n';
}
int list::del(const char *last)
{
        phone *place,*tmp;
        //if the first object id being deleted
        if(!strcmp(last,head->last_name))
        {
                tmp=head;
                head=head->next;
                delete tmp;
                return(1);
        }

        place=find(last);
        tmp=place ->next;
        if(tmp==NULL||strcmp(tmp->last_name,last)!=0)
                return(0);
        else
        {
                place->next=place->next->next;
                delete tmp;
                return(1);
        }
}
list::~list()
{
        phone *tmp,*tmpn;
        for(tmp=head,tmpn=head->next;tmpn!=NULL;tmp=tmpn,tmpn=tmpn->next)
                delete tmp;
        delete tmp;
};

---

linkedlist.cpp

Code:

---

// linked list.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <iostream>
#include "phone.h"
#include "list.h"
using namespace std;

int main()
{
        char last[15],first[15];
        long num;
        list *ll=new list("Lenon","Jenon",456641);
        phone *ph1=new phone("Haim","Moshe",345765),*ph2=new phone("Rabin","itzhak",467323),*phone_ptr;
        ll->insert(ph1);
        ll->insert(ph2);
        ll->print();
        ll->del("Haim");
        cout<<"AFTER DELETING\N";
        ll->print();
        cout<<"input last name first name phone number\n";
        do
        {
                cin>>last>>first>>num;
                phone_ptr=new phone(last,first,num);
                ll->insert(phone_ptr);
        }
        while(num);
        ll->print();
        delete ll;
        cin.get();
        return 0;
}

---

and visual studio writes me:
1>------ Build started: Project: LinkedList, Configuration: Debug Win32 ------
1> phone.cpp
1>c:\users\alex\documents\visual studio 2010\projects\linkedlist\linkedlist\phone.cpp(1): warning C4627: '#include <iostream>': skipped when looking for precompiled header use
1> Add directive to 'StdAfx.h' or rebuild precompiled header
1>c:\users\alex\documents\visual studio 2010\projects\linkedlist\linkedlist\phone.cpp(2): warning C4627: '#include "phone.h"': skipped when looking for precompiled header use
1> Add directive to 'StdAfx.h' or rebuild precompiled header
1>c:\users\alex\documents\visual studio 2010\projects\linkedlist\linkedlist\phone.cpp(3): warning C4627: '#include <string>': skipped when looking for precompiled header use
1> Add directive to 'StdAfx.h' or rebuild precompiled header
1>c:\users\alex\documents\visual studio 2010\projects\linkedlist\linkedlist\phone.cpp(4): warning C4627: '#include <process.h>': skipped when looking for precompiled header use
1> Add directive to 'StdAfx.h' or rebuild precompiled header
1>c:\users\alex\documents\visual studio 2010\projects\linkedlist\linkedlist\phone.cpp(5): warning C4627: '#include <iomanip>': skipped when looking for precompiled header use
1> Add directive to 'StdAfx.h' or rebuild precompiled header
1>c:\users\alex\documents\visual studio 2010\projects\linkedlist\linkedlist\phone.cpp(38): fatal error C1010: unexpected end of file while looking for precompiled header. Did you forget to add '#include "StdAfx.h"' to your source?
1> list.cpp
1>c:\users\alex\documents\visual studio 2010\projects\linkedlist\linkedlist\list.cpp(1): warning C4627: '#include <iostream>': skipped when looking for precompiled header use
1> Add directive to 'StdAfx.h' or rebuild precompiled header
1>c:\users\alex\documents\visual studio 2010\projects\linkedlist\linkedlist\list.cpp(2): warning C4627: '#include <string>': skipped when looking for precompiled header use
1> Add directive to 'StdAfx.h' or rebuild precompiled header
1>c:\users\alex\documents\visual studio 2010\projects\linkedlist\linkedlist\list.cpp(3): warning C4627: '#include "phone.h"': skipped when looking for precompiled header use
1> Add directive to 'StdAfx.h' or rebuild precompiled header
1>c:\users\alex\documents\visual studio 2010\projects\linkedlist\linkedlist\list.cpp(4): warning C4627: '#include "list.h"': skipped when looking for precompiled header use
1> Add directive to 'StdAfx.h' or rebuild precompiled header
1>c:\users\alex\documents\visual studio 2010\projects\linkedlist\linkedlist\list.cpp(86): fatal error C1010: unexpected end of file while looking for precompiled header. Did you forget to add '#include "StdAfx.h"' to your source?
1> LinkedList.cpp
1>c:\users\alex\documents\visual studio 2010\projects\linkedlist\linkedlist\phone.h(1): error C2011: 'phone' : 'class' type redefinition
1> c:\users\alex\documents\visual studio 2010\projects\linkedlist\linkedlist\phone.h(1) : see declaration of 'phone'
1>c:\users\alex\documents\visual studio 2010\projects\linkedlist\linkedlist\linkedlist.cpp(14): error C2027: use of undefined type 'phone'
1> c:\users\alex\documents\visual studio 2010\projects\linkedlist\linkedlist\phone.h(1) : see declaration of 'phone'
1>c:\users\alex\documents\visual studio 2010\projects\linkedlist\linkedlist\linkedlist.cpp(14): fatal error C1903: unable to recover from previous error(s); stopping compilation
1> Generating Code...
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========




I think this book is too old and i will change the book to this:
http://newdata.box.sk/bx/c/#heading1

Whatever book you guys are using that is teaching you to put next* inside the class that your linked list contains, please burn it. Burn it with fire.

and what do you recommend me to do?

http://newdata.box.sk/bx/c/#heading1
this booj is okay?

Quote:

---

Originally Posted by MrAlex

and what do you recommend me to do?

http://newdata.box.sk/bx/c/#heading1
this booj is okay?

---

Is that the link you're using? That book appears really dated. It's using features that are no longer supported, but here is where it shows how to implement a linked list.
http://newdata.box.sk/bx/c/htm/ch11.htm#Heading47

No its other book
linked lists are still useful?

Quote:

---

Originally Posted by MrAlex

No its other book
linked lists are still useful?

---

Code:

---

#include <list>

---

What does that line do, and what is <list>?

It is the standard C++ linked list class, already written, already works.

Regards,

Paul McKenzie

Code:

---

#include <list>
#include <string>

class phone
{
    public:
        std::string first_name;
        std::string last_name;
        long number;
        phone(const std::string& last,const std::string& first,long num) : first_name(first), last_name(last), number(num)
        { }
};

int main()
{
  std::list<phone> PhoneList;
  PhoneList.push_back(phone("Smith", "Joe", 111111));
  PhoneList.push_back(phone("Brown", "Frank", 222222));
  PhoneList.push_back(phone("Jones", "Jill", 333333));
}

---

I just added 3 phone numbers to the linked list. I can easily remove items also. All of that code you have is in this little program, with the exception that it works, compiles, it's standard (it must compile on every single ANSI C++ compiler out there) and is written by industry professionals.

Regards,

Paul McKenzie

I think writing a list is still a good exercise for beginners and every programmer should understand how they're implemented.