Visual studio functions

When I try to declare a function in Visual Studio 2010 Pro I always get an error. The code below is what I am trying to build. Am I missing something? Thanks for the help.

Code:

---


// void function example
#include <iostream>
#include "stdafx.h"
using namespace std;

void printmessage ()
{
  cout << "I'm a function!";
}

int main ()
{
  printmessage ();
  return 0;
}

---

Fatal Error C1010
Use either of the methods. Prefer the first one if you're just starting out.

Thanks that solved it