This is a program we had to do for class, and it works just fine but I get a curious error message.

payroll.cpp(57) : warning C4551: function call missing argument list

To save you the trouble of having to count The line it's complaining about is in red, it's the payroll.close line.

Why am I getting this error, anyone know?

Code:
#include <iostream>
#include <fstream>
#include <cstdlib>
#include <iomanip>

using namespace std;

void createPayroll();
void createReport();

int main()
{
	char ans;

	createPayroll();

	cout << "\n\nCreate Payroll Report? <y or n>";
	cin >> ans;

	if (ans == 'y')
	{
		createReport();
		cout << "\nReport has been created\n";
	}
	return 0;
}

void createPayroll()
{
	int empNum;
	double hours, payRate;

	ofstream payroll;
	payroll.open("payroll.txt", ios::app);

	if (payroll.fail())
	{
		cout << "Error opening output file." << endl;
		exit(1);
	}
    
	cout << "Enter Employee Number (0 to quit): ";
	cin >> empNum;
	while (empNum > 0)
	{
        cout << "Enter Hours Worked: ";
		cin >> hours;
		cout << "Enter Pay Rate: ";
		cin >> payRate;
				
		payroll << empNum << " " << hours << " " << payRate << endl;

		cout << "\n\nA record has been added.\n";
		cout << "Enter Employee Number (0 to quit): ";
		cin >> empNum;
	}
	payroll.close;
}

void createReport()
{
	int empNum;
	double hours, payRate, pay;

    ifstream payroll;
	ofstream report;

	payroll.open("payroll.txt");
	report.open("report.txt", ios::app);

	if (payroll.fail())
	{
		cout << "Error opening input file.";
		exit(1);
	}
	if (report.fail())
	{
		cout << "Error opening output file.";
		exit(1);
	}
	
	report.setf(ios::fixed);
	report.setf(ios::showpoint);
	report.precision(2);

	report << "Emp Number" << setw(12) << "Hours" << setw(12) << "Pay Rate" << setw(12) << "Pay" << endl; 
	while (payroll >> empNum >> hours >> payRate)
	{
		if (hours > 40)
		{
			pay = (((hours - 40) * payRate) * 1.5) + 40 * payRate;
		}
		else
		{
			pay = hours * payRate;
		}
		report << empNum << setw(18) << hours << setw(12) << payRate << setw(12) << pay << endl;
	}
}