using file stream in a linked list

[rey9]

can anyone help me implement file stream in a linked list?

here are my 3 files

myHeader.h

//#include <iostream>
#ifndef LIST
#define LIST


class List
{
 private:
	class choco
	{
	public:
		string bName;
		double bPrice;
		string bMDate;
		string bExDate;
		choco *next;
		
	public:
		choco()
		{
			bName = "";
			bPrice = 0.0;
			bMDate = "";
			bExDate = "";
			next = NULL;
		}
		
		choco(string n, double p, string md, string xd)
		{
			bName = n;
			bPrice = p;
			bMDate = md;
			bExDate = xd;
			next = NULL;
		}
		
		choco(string n, double p, string md, string xd, choco *nx)
		{
			bName = n;
			bPrice = p;
			bMDate = md;
			bExDate = xd;
			next = nx;
		}
		
		string getName()
		{return bName;}
		double getPrice()
		{return bPrice;}
		string getMD()
		{return bMDate;}
		string getXD()
		{return bExDate;}
		choco *getNext()
		{return next;}
		void setNext(choco *n)
		{next = n;}
	};
	
 public:
	List();
	bool empty() const;
	int countNode();
	void display();
	
	void insert(string name, double price, string MD, string XD, int pos);

 private:
	choco *ptr;
};
#endif 

myDriver.cpp

#include<iostream>
using namespace std;

#include "myDriver.h"

List::List()
{ptr = NULL;}

bool List::empty() const
{
	if(ptr == NULL)
		return true;
	return false;
}

int List::countNode()
{
	int counter = 0;
	choco *temp = ptr;
	while(temp != NULL)
	{
		counter++;
		temp = temp->getNext();
	}
	return counter;
}

void List::display()
{
	choco *temp = ptr;
	if(ptr == NULL)
		cout << "NO CHOCOLATE TO BE DISPLAYED" << endl;
		
	int i = 1;
	
	cout << "+============================================+" << endl;
	cout << "|              CHOCOLATE RECORD              |" << endl;
	cout << "+============================================+" << endl;
	
	while(ptr != NULL)
	{
		cout << "+=======================================================+" << endl;
		cout << "|  CHOCOLATE NUMBER # " << i++ << endl;
		cout << "|  CHOCOLATE NAME      :  " << temp->getName() <<endl;
		cout << "|  PRICE               :  " << temp->getPrice() << endl;
		cout << "|  MANUFACTURING DATE  :  " << temp->getMD() << endl;
		cout << "|  EXPIRATION DATE     :  " << temp->getXD() << endl;
		cout << "+=======================================================+" << endl;
		cout << endl << endl;
		ptr = ptr->next;
	}
}


void List::insert(string name, double price, string MD, string XD, int pos)
{
	int c = countNode();
	
	if(pos < 1 || pos > c + 1)
		cout << "CANNOT INSERT THAT RECORD. TRY AGAIN" << endl;
	else
	{
		choco *newptr = new choco(name,price,MD,XD);
		
		if(ptr == NULL && pos == 1)
			ptr = newptr;
		else if(pos == 1 || ptr != NULL)
		{
			newptr->setNext(ptr);
			ptr = newptr;
		}
		else if(pos == c+1)
		{
			choco *predptr = ptr;
			
			while(ptr->getNext() != NULL)
			{
				predptr = predptr->getNext();
			}
			predptr->setNext(newptr);
		}
		else
		{
			choco *ptr1 = ptr;
			choco *ptr2 = ptr;
			
			for(int i = 2; i != pos; i++)
				ptr1 = ptr->getNext();
			for(int j = 1; j != pos; j++)
				ptr2 = ptr->getNext();
				
			choco *ptr3 = new choco(name,price,MD,XD,ptr2);
			ptr1->setNext(ptr3);
		}
		cout << "NEW RECORD INSERTED AT POSITION " << pos << endl;
	}
}

myMain.cpp

#include <iostream>
#include<fstream>
using namespace std;

#include "myHeader.h"

int main()
{
  List l;
  string cname;
  double cprice;
  string cMDate;
  string cXDate;
  int pos;
  char command;

  do
  {
	cout << "+=============================================+" << endl;
	cout << "|     [a]dd       [d]isplay       e[x]it      |" << endl;
	cout << "+=============================================+" << endl;
   cin >> command;
   switch (command)
   {
      case 'a' :
			ifstream in("input.txt");
			in >> cname >> cprice >> cMDate >> cXDate;
			cout << "INSERTING DATA" << endl << endl;
			cin.get();
			cout << "\t\t  CHOCOLATE NAME      :  "; getline(in, cname);
			cout << "\t\t  PRICE               :  "; in >> cprice;
			cin.get();
			cout << "\t\t  MANUFACTURING DATE  :  "; getline(in, cMDate);
			cout << "\t\t  EXPIRATION DATE     :  "; getline(in, cXDate);
			cout << "\t\t  ENTER POSITION      :  "; in >> pos;
			cout << endl;
			l.insert(cname, cprice, cMDate, cXDate,pos);
			break;
			
      case 'd' :
			l.display();
			break;
   }
  } while (command != 'x');

  return 0;
}

thanks in advance :)

[AbstractionAnon]

You haven't stated what you want to do with a file stream.
I'm guessing you want to read and write choco instances to/from a file stream.

To write choco instances to an ostream, you're going to want to open the file,
then iterate through your list. For each choco entry, you're going to need a function that serializes (writes) a choco instance to the ostream. Then close the file when you've written all the instances.

Likewise to read from a file, you will need to open the file. Again you will need a function to read a choco instance from the file into a choco instance. You then need to link that choco instnace into your list. And of course when your reach eof, you will need to close the file.