class Timer error message :O

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.

Code:

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#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.";

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

Your class definition cannot be inside a method. Have it outside the main() function.