class Timer error message :O

[prattcmp]

I keep getting this error whenever I compile my program. I am using XCode and am not sure of what to do or how to fix this error.

#define TIMER_H_DEF
#include <iostream>
#include <string>
#include <sys/time.h>
int main ()
class Timer // <----- Error: Expected initializer before 'class'
{
public:
	timer();
	~Timer();
	using std::cout;
	using std::cin;
	using std::string;
	int enter, gold, number, america, newgold;
	int twogold, city, threegold, passcode;
// Beginning of game.
cout << "Welcome to the coin game. "
<< "The objective is to get 1000 coins by the end.\n"
	<< "\nNow please create a random 8 number passcode "
	<< "using ONLY numbers.\n";

	cin >> enter;
	
	while (enter <= 10000000 || enter >= 99999999 ) {
		cout << "\nYour passcode is less than 8 digits "
		<< "(do not use 0 as the first digit).\n";
		
		cout << "Please try again.\n";
		cin >> enter;
	}

cout << "\nFirst, solve 432 * 23, "
<< "in order to get your first 50 coins "
<< "(no calculators!).\n";
	timer.start();
	cin >> number;
	timer.stop();
	
	cout << "You took "
	<< timer.getElapsedTimeInMilliSec
	<< " ms "
	<< "to solve the equation.";

This is not the entire program so don't worry if you don't see a return 0 or anything.