Use array to store Class objects.

[eibarra]

So starting with the Item.h file :

#ifndef ITEMH
#define ITEMH
using namespace std;
class Item
{
public:
	Item();
	Item( int item_id, string desc, double price );
	int getId();
	string getDescription();
	double getPrice();
	string toString();
private:
	int _item_id;
	string _desc;
	double _price;
};
#endif 

I need to create a class to store the strings created by the Item.h file containing the id, description, and price.
So up till now I created the following .h and .cpp file:

#ifndef CONTAINER_H
#define CONTAINER_H
#include "item.h"
class Container
{
public: 
	Container();
	~Container();
	void add_item(Item item);
private:
	string* _items; //dynamic string since I want to be able to add data as                 many times as needed
	unsigned int _count;
};
#endif 

.CPP file:

#include <iostream>
#include <string>
#include "container.h"
using namespace std;
Container::Container(): _items(NULL),_count(0)
{}
Container::~Container()
{
	if (_items != (NULL))
	{
		delete [] _items;
	}
}
void Container::add_item(Item item)
{
	string*_items += item; // I'm getting an error in this expression
}

I think I'm getting the wrong idea about strings. I thought I could add data just by using '+=' but apparently not .
Please any help

[BigBlackSheep]

First of all, you need to include the <string> header.
Secondly, you have a completely wrong idea of pointers, not strings. Read up on these:
http://www.cplusplus.com/doc/tutorial/pointers/
http://www.cplusplus.com/doc/tutorial/dynamic/

In your case though, you should just use an std::vector class:
http://www.cplusplus.com/reference/vector/vector/

[MiiNiPaa]

1) I think you are mixing up string and vector. Strings exists to store textual data only. You cannot white some random data in it What you can do: (a) Use a vector<Item>; (b) overload string operator+=(string, Item) to do wht you want; (c) you can define casting Item → string and cast it before assigment.
NOTE: Do not use (b) and (c). I have included them as a reference only!

2) string*_items += item;
You are declaring a new variable _items, which shadows member variable with the same name.

3) string*_items += item;
you are trying to add pointer to string and Item, which doesn't make any sense.

[eibarra]

Update to my code:
.h File

#ifndef CONTAINER_H
#define CONTAINER_H
#include <iostream>
#include <sstream>
#include <string>
#include <iomanip>
#include "item.h"
class Container
{
public: 
	Container();
	~Container();
	void add_item(Item );
	void displayitems(int position);
	void removeitems(int position);

private:
	Item _items[100];
	int _count;

};
#endif 

.cpp File:

#include "container.h"
Container::Container(){_count=0;}
Container::~Container()
{	
	if (_items != (NULL))
	{
		delete [] _items;
	}
}
void Container::add_item(Item item)
{
	_items[_count]= item;
	_count++;
}
void Container::displayitems(int position)
{
        for (int i=0, i < _count; i++)  // Getting an error here saying 'i' is not a template? and _count does not have a constant value?
}

Seems like there's no need of pointers or vectors, works fine using only strings.
Got a question though, when declaring the constructor how can I set a default value to the _items string?