Need help regarding my calculatepay function

[Tampopo]

I'm facing this error "no matching function for call to `Employee::calculatePay'
I figured is because I have not return any value in my calculatePay(). However I have no idea what to return in the function as I have to output 2 "cout" messages when function is called, one is grosspay another is netpay.
Still new to c++.. pls advice..


Employee class

#include <iostream>
#include <sstream>

using namespace std;

/*================================================= Employee Class ====================================================*/

class Employee
{
private:
int id;
string name;
string dob;
string address;
string phoneNo;
string email;
int deptNo;
float basicPay;

public:
Employee();
Employee(int empId, string empName, string empDOB, string empAdd, string phone, string emailAdd, int deptNum, float bPay);
void setFields(int empId, string empName, string empDOB, string empAdd, string phone, string emailAdd, int deptNum, float bPay);
string toString();

// Get&Set Function for id
int getId();
void setId(int empId);
// Get&Set Function for name
string getName();
void setName(string empName);
// Get&Set Function for dob
string getDOB();
void setDOB(string empDOB);
// Get&Set Function for address
string getAddress();
void setAddress(string empAdd);
// Get&Set  Function for phoneNo
string getPhone();
void setPhone(string phone);
// Get&Set  Function for email
string getEmail();
void setEmail(string emailAdd);
// Get&Set  Function for deptNo
int getDeptNo();
void setDeptNo(int deptNum);
// Get$Set  Functions for basicPay
float getBasicPay();
void setBasicPay(float bPay);

float calculatePay(float basicPay);
//float calculateTax
void displayData();


// End of Employee class declarations
}; 		


/*================================================ Functions Implementations ==================================================*/

//Employee default constructor
Employee::Employee()
{
 id = 0;
 name = "";
 dob = "";
 address = "";
 phoneNo = "";
 email = "";
 deptNo = 0;
 basicPay = 0.0;
}

//Employee 2nd constructor
Employee::Employee(int empId, string empName, string empDOB, string empAdd, string phone, string emailAdd, int deptNum, float bPay)
{
	id = empId;
	name = empName;
	dob = empDOB;
	address = empAdd;
	phoneNo = phone;
	email = emailAdd;
	deptNo = deptNum;
	basicPay = bPay;
}

// Get&Set Function for id
int Employee::getId()
{
   return id;
}
void Employee::setId(int empId)
{
   id = empId;
}
// Get&Set Function for name
string Employee::getName()
{
   return name;
}
void Employee::setName(string empName)
{
   name = empName;
}
// Get&Set Function for dob
string Employee::getDOB()
{
   return dob; 
}
void Employee::setDOB(string empDOB)
{
   dob = empDOB;
}
// Get&Set Function for address
string Employee::getAddress()
{
   return address;
}
void Employee::setAddress(string empAdd)
{
   address = empAdd;
}
// Get&Set Function for phoneNo
string Employee::getPhone()
{
   return phoneNo;
}
void Employee::setPhone(string phone)
{
   phoneNo = phone;
}
// Get&Set Function for email
string Employee::getEmail()
{
   return email;
}
void Employee::setEmail(string emailAdd)
{
   email = emailAdd;
}
// Get&Set Function for deptNo
int Employee::getDeptNo()
{
   return deptNo;
}
void Employee::setDeptNo(int deptNum)
{
   deptNo = deptNum;
}

// Get&Set Function for basicPay
float Employee::getBasicPay()
{
   return basicPay;
}
void Employee::setBasicPay(float bPay)
{
   basicPay = bPay;
}

string Employee::toString()
{
stringstream data;
data.str("");

data << "Employee's id            : " << Employee::id << endl;
data << "Employee's name          : " << Employee::name << endl;
data << "Employee's DOB           : " << Employee::dob << endl;
data << "Employee's address       : " << Employee::address << endl;
data << "Employee's phone no.     : " << Employee::phoneNo << endl;
data << "Employee's email address : " << Employee::email << endl;
data << "Employee's dept. no.     : " << Employee::deptNo << endl;

return data.str();
}



void Employee::displayData()
{
   cout<<Employee::toString();
}

float Employee::calculatePay(float bPay)
{
   float netPay = 0.8 * basicPay;
   cout<<"Employee's Gross Pay is : " << Employee::basicPay
       <<"Employee's Net Pay is : " << netPay << endl;
    
}
   

/*void Employee::setFields(int empId, string empName, string empDOB, string empAdd, string phone, string emailAdd, int deptNum)
{
	id = empId;
	name = empName;
	dob = empDOB;
	address = empAdd;
	phoneNo = phone;
	email = emailAdd;
	deptNo = deptNum;
}*/

main class

#include <iostream>
#include <sstream>
#include <string>	
#include "Employee.cpp"
//#include "OrdinaryEmployee.h"
//#include "SeniorEmployee.h"

using namespace std;


const static int MAXIMUM_DATA_SIZE = 100;

// To prevent invalid input type (int)
int getline_i()
{
	while(cin.fail()) {
		cin.clear();
	}
	string s;
	getline(cin, s);
	stringstream ss;
	ss.str(s);

	int i;
	ss >> i;
	return i;
	}
	
// To prevent invalid input type (float)
float getline_f()
{
	while(cin.fail()) {
		cin.clear();
	}
	string s;
	getline(cin, s);
	stringstream ss;
	ss.str(s);

	float f;
	ss >> f;
	return f;
}

// Add new employee data function
Employee addEmpData()
{
int id;
string name;
string dob;
string address;
string phoneNo;
string email;
int deptNo;
float basicPay;

cout<<"\n[  Add new employee data  ]\n"<<endl
<<"Enter new id : ";
id = getline_i();
cout<<"Enter new name : ";
getline(cin, name);
cout<<"Enter your date of birth : ";
getline(cin, dob);
cout<<"Enter your address : ";
getline(cin, address);
cout<<"Enter your phone number : ";
getline(cin, phoneNo);
cout<<"Enter your email address : ";
getline(cin, email);
cout<<"Enter your dept. number : ";
deptNo = getline_i();
cout<<"Enter your basic pay : ";
basicPay = getline_f();
cout<<"\n\nNew employee data have been keyed into the system...\n";

Employee emp = Employee(id, name, dob, address, phoneNo, email, deptNo, basicPay);

return emp;

}

int main()
{
int dataCounter = 0;
Employee empArray[MAXIMUM_DATA_SIZE];

int choice = 0;

while(true) {

	cout<<"\n\n";
	cout<<"Welcome to the Salary System"  <<endl
	    <<"1) Add New Employee Data"           <<endl
	    <<"2) Display Employee's Profile" <<endl
	    <<"3) Quit"			      
	    <<endl;
	// Waiting for user to enter choice
	cout<<"Please enter your choice: ";
	choice = getline_i();
	
	if( choice < 1 || choice > 3 ) {
	cout<<"Invalid input ! Please enter your choice again...";
	choice = 0;
	}
	
	if(choice == 1) {
	if(dataCounter < MAXIMUM_DATA_SIZE)
	{
	empArray[dataCounter++] = addEmpData();
	}
	    		} // End of option 1
	    		
	else if(choice == 2) {
	for(int i = 0; i < dataCounter; i++)
		{
		cout<< "\n";
		empArray[i].displayData();
		cout<< "\n";
		empArray[i].calculatePay();
		}
			      } // End of option 2
			      
	else if(choice == 3) {
	cout<< "\nHave a nice day, good bye.\n";
	break;
			      } // End of option 3
}
}

[binarybob350]

Change
float Employee::calculatePay(float bPay)
to
void Employee::calculatePay()