c2065 day 1 error

[Abrium]

I searched the forum but I didn't find anything even remotely close to the simplicity of my problem...

I don't need help with homework, have a big project due, or have a reason to rely on C++... yet. I just have one simple question about this damn C2065 error claiming I have an undeclared identifier. I did nothing but write one line of code to begin a hello world program and I am instantly hit with this identifier problem at every turn. It is very disheartening. I have done some research but none of the suggestions about how to fix the MSVC++ complier help.

How come the following code:

#include "stdafx.h"

int _tmain(int argc, _TCHAR* argv[])
{
	printf( "Hello World!" );
	cout<<"hello world!";

	return 0;
}

Returns a damn error. This is getting quite annoying. I always considered myself pretty quick at catching on and then I spent an hour dealing with this.

[Atheist]

I take it that 'cout' is what it is complaining about?
In order to use cout you'll have to include the iostream library:

#include "stdafx.h"
#include <iostream>
 
using namespace std;
 
int _tmain(int argc, _TCHAR* argv[])
{
    printf( "Hello World!" );
    cout<<"hello world!";
    return 0;
}

Since cout resides within the std namespace, I've specified "using namespace std" at the top, or else one would've had to specify the full name for cout:

std::cout << "hello world";