error on compilng a C++ file using g++

Hi group,

I'm getting warning as following when I compile two cpp files. These are not my files it happened I found them at http://www.functionx.com/cpp/examples/simpleclass.htm as I was trying to learn how "ctags" works in VIM or vi

In order to compile and run I use:

$g++ Exo.cpp Cube.cpp   -o  test

Questions:
1) What caueses warning and how can I fix it? currently I have output which works fine but need to know how to get rid of this warnnig.
2)Does anybody know how I can use ctags in vim? any good resource with example?




Source is at snippet window but error message is:

In file included from /usr/lib/gcc/i386-redhat-linux/4.1.1/../../../../include/c++/4.1.1/backward/iostream.h:31,
                 from cube.cpp:2:
/usr/lib/gcc/i386-redhat-linux/4.1.1/../../../../include/c++/4.1.1/backward/backward_warning.h:32:2: warning: #warning This file includes at least one deprecated or antiquated header. Please consider using one of the 32 headers found in section 17.4.1.2 of the C++ standard. Examples include substituting the <X> header for the <X.h> header for C++ includes, or <iostream> instead of the deprecated header <iostream.h>. To disable this warning use -Wno-deprecated.

Header File: cube.h  
 
 
#ifndef CUBE_H
#define CUBE_H
 
class Cube
{
public:
	Cube();
	~Cube();
	void setSide(double s);
	double getSide();
	double Area();
	double Volume();
	void Properties();
private:
	double Side;
};
 
#endif
Source File cube.cpp  
 
 
#include <iostream.h>
#include "cube.h"
 
Cube::Cube()
{
}
 
Cube::~Cube()
{
}
 
void Cube::setSide(double s)
{
	Side = s <= 0 ? 1 : s;
}
 
double Cube::getSide()
{
	return Side;
}
 
double Cube::Area()
{
	return 6 * Side * Side;
}
 
double Cube::Volume()
{
	return Side * Side * Side;
}
 
void Cube::Properties()
{
	cout << "Characteristics of this cube";
	cout << "\nSide   = " << getSide();
	cout << "\nArea   = " << Area();
	cout << "\nVolume = " << Volume() << "\n\n";
}
Main File: Exo.cpp  
 
 
#include "cube.h"
 
void main()
{
	Cube cube;
	cube.setSide(-12.55);
	cube.Properties();
 
	Cube de;
	de.setSide(28.15);
	de.Properties();
}

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