How use string ?

code:
//File:Str.h

#ifndef STR_H
#define STR_H
#include"string.h"
class Str
{
public:
Str();
void setId(int);
void setName(string);
void setPrice(int);
void setStock(int);
void Display()const;
int getId()const;
string getName()const;
int getPrice()const;
int getStock()const;

private:
int id;
string name;
int price;
int stock;
};
#endif
/--------------------------------------------------------------------/
//File:Str.cpp

#include"Str.h"
#include<iostream>
#include<string>

using namespace std;

Str::Str()
{
id = 0;
name = "empty";
price = 0;
stock = 0;
}

void Str::setId(int val)
{
id = val;
}

void Str::setName(string val)
{
name = val;
}

void Str::setPrice(int val)
{
price = val;
}

void Str::setStock(int val)
{
stock = val;
}

void Str:isplay()const
{
cout<<"ID = "<<id<<endl;
cout<<"Name = "<<name<<endl;
cout<<"Price = "<<price<<endl;
cout<<"Stock = "<<stock<<endl;
}

int Str::getId()const
{
return id;
}

string Str::getName()const
{
return name;
}

int Str::getPrice()const
{
return price;
}

int Str::getStock()const
{
return stock;
}
/--------------------------------------------------------------------/

Please help me.How to use string in this code?

How to read "please read before posting code"
How to read "use code tags"

I'm sorry.

Code:

//File:Str.h

#ifndef STR_H
#define STR_H
#include"string.h"
class Str
{
public:
	Str();
	void setId(int);
	void setName(string);
	void setPrice(int);
	void setStock(int);
	void Display()const;
	int getId()const;
	string getName()const;
	int getPrice()const;
	int getStock()const;

private:
	int id;
	string name;
	int price;
	int stock;
};
#endif

//File:Str.cpp

#include"Str.h"
#include<iostream>
#include<string>

using namespace std;

Str::Str()
{
	id = 0;
	name = "empty";
	price = 0;
	stock = 0;
}

void Str::setId(int val)
{
	id = val;
}

void Str::setName(string val)
{
	name = val;
}

void Str::setPrice(int val)
{
	price = val;
}

void Str::setStock(int val)
{
	stock = val;
}

void Str::Display()const
{
	cout<<"ID = "<<id<<endl;
	cout<<"Name = "<<name<<endl;
	cout<<"Price = "<<price<<endl;
	cout<<"Stock = "<<stock<<endl;
}

int Str::getId()const
{
	return id;
}

string Str::getName()const
{
	return name;
}

int Str::getPrice()const
{
	return price;
}

int Str::getStock()const
{
	return stock;
}

Help me please.how to use string?

Code:

#include"string.h"

That should probably be:

Code:

#include <string>
using std::string;

thank you very much.