Trying to create a payroll calculation program

I am trying to create a Payroll Calculation program that will calculate an employees hourly pay on a weekly
basis; including overtime, payroll deductions (federal, state, local taxes, medical insurance deductions), etc...

I am pretty new to programming and need some help with this. I have included the code that I have done but am not sure if I am coding this correctly.

I am trying to create it so that the main will only control execution statements and supporting function calls. Could someone please help me with this program?

Code:

#include<iostream>
#include<string>

using namespace std;



double OvertimeHours [2];
double HourlyPayRate ;
double OvertimePay;
double GrossPay;
const double StateTax = .30;			//30% State Tax Rate
 

int main()
{
	int EmployeeID;

	void HourlyPayRate(double hours; double rate)
	void 
	

	int MaritalStatus;
	

/**************************************************************************************************/
//Determines the Marital Status of Employees
	switch(MaritalStatus)
	{
	case 'M':
	case 'm':
		cout<< "Married";
		break;
	case 'S':
	case 's':
		cout<< "Single";
		break;
	default:
		cout << "Unknown Selection!\n"
			 << "Choose Again.\n";
	}
/**************************************************************************************************/
	if (MaritalStatus == 'M' || 'm')
	{
		FedTax = .15 * GrossPay;			//15% federal income tax for married employees
		GrossPay = GrossPay - 18.00;		//$18.00 medical insurance deduction

	else 
		if (MaritalStatus == 'S' || 's')	
		FedTax = .20 * GrossPay;			//20% federal income tax for single employees
		GrossPay = GrossPay - 10.00;		//$10.00 medical insurance deduction



/**************************************************************************************************/
//This function will calculate the hourly wage
void HourlyPayRate()
{
	double hours = 0;
	double rate = 0

    cout << endl << Number of Hours Worked:   ";
	cin >> hours;
    
	cout << endl << "Pay Per Hour is:     ";
	cin >> rate;
	cout << endl;

	if (hours <= 40)
	{
		hours = (rate * hours);
		cout << endl << setiosflags(ios::fixed) << setprecision (2)
			 << "The hourly worker's weekly gross is: $" << hours << endl;

		return;
	}
	
	if (hours > 40)
	{
		hours = (rate * 40) + ((rate * 1.5) * (hours - 40));
		cout << endl << setiosflags(ios::fixed) << setprecision (2)
			 << "The hourly worker's weekly gross is: $" << hours << endl;

		return;
	}

	else
	{
		cout << endl << "Data Entry Not Valid, Please Reenter Data." << endl;

		return;
	}
	return;
}

Is there a better way to achieve my goal? I am not sure but it seems as though my code is out of place. Should I continue on with the way I am coding or should I use object oriented programming to create my program? if I should then how so? I am so confused

I really just glanced through it but here are some things.

Some of your if statements need to have braces around them. const double StateTax = .30 could be expressed as .3 instead since it is the same thing (it could also be a float). Your return statement has no parameters (put "return(0);" or "return 0;").

Like i said before I just quickly glanced at it; I am in a hurry to get to the dinner table. Oh and when you are includinn your needed files I find it easier to understand if you put a space between #include and <file.to.include>.

Oh, and bold is a little hard to read.