Hello! / "Classes" help!

[Awitte58]

Hello all. Newbie here!
So Im trying to learn how Visual Express works. I did very little programming before using Dev(??) compiler where all of your code was in one big edit box. Now I can have multiple files and I think its mixing me up.

In my "project" I have a working class cpp already created with a header file and you want to use it in my main cpp file.
I am just having trouble remembering how to 'call' or 'reference' the class in my main file.

Ignore all of the commented out scratch work. I have an understanding of what I need to do in my loops etc, but how do I link the Timer class to my main cpp?
The way I have it now it doesn't error out the "class Timer;" but in my main portion it tells me "Timer.start();" is incomplete which tells me I am not correctly linking the class to this bit of code.

It is a timer object to, well, time things. hah

Thanks in advance! Sorry for the long post I know how that is annoying.
Alex

  
#include <iostream>
using namespace std;

class Timer;

int main()
{	double b = 1.8;
	Timer.start();
//
//	do
//	{b*b
//
//	i++;
//	}
//	while {i < 999999999999};
// return 0;
//}
//
////
//	timer.start();
//for (long int i=0; i>999,999,999,999; i++) double x=q*q;
//timerMult.stop();
//cout << "Time for squaring a double by multiplication is " << timer.getElapsedTimeInMicroSeconds() << " microseconds" << endl << endl;
//double mult = get.ElapsedTimeInMicroSeconds();
//
//
//do
//{
//........
//i++;
//} while (i < 999999999999);
//  

[Stewbond]

All you need to do is drag and drop your main.cpp and your timer.cpp into the "sources" folder in your solution explorer if they aren't already there. Then #include the header in both sources.

#include "Timer.h"

#int main()
{
    Timer.start();
    // ...
}

[Awitte58]

I have 3 files in my project.
Under the "header files" is the "Timer.h"
Under the "Source code" files is "Timer.cpp" and my "main.cpp"

Isnt there a way to call or reference my timer code into my main without having to copy and paste all of the code into one big edit box?

Thanks for the response.