//******************************************************************
// Payroll program
// This program computes each employee's wages and
// the total company payroll
//******************************************************************
#include <iostream>
#include <fstream>    // For file I/O

using namespace std;

void CalcPay( float, float, float& );

const float MAX_HOURS = 40.0;   // Maximum normal work hours
const float OVERTIME = 1.5;     // Overtime pay rate factor

int main()
{
    float    payRate;       // Employee's pay rate
    float    hours;         // Hours worked
    float    wages;         // Wages earned
    float    total;         // Total company payroll
    int      empNum;        // Employee ID number
    ofstream payFile;       // Company payroll file

    payFile.open("payfile.dat");            // Open the output file
    total = 0.0;                            // Initialize total
    cout << "Enter employee number: ";      // Prompt
    cin >> empNum;                          // Read employee ID no.
    while (empNum != 0)                     // While employee number
    {                                       //   isn't zero
        cout << "Enter pay rate: ";         // Prompt
        cin >> payRate;                     // Read hourly pay rate
        cout << "Enter hours worked: ";     // Prompt
        cin >> hours;                       // Read hours worked
        CalcPay(payRate, hours, wages);     // Compute wages
        total = total + wages;              // Add wages to total
        payFile << empNum << payRate        // Put results into file
                << hours << wages;
        cout << "Enter employee number: ";  // Prompt
        cin >> empNum;                      // Read ID number
    }
    cout << "Total payroll is "             // Print total payroll
         << total << endl;                  //   on screen
    return 0;                               // Indicate successful
}                                           //   completion

//******************************************************************

void CalcPay( /* in */  float  payRate,     // Employee's pay rate
              /* in */  float  hours,       // Hours worked
              /* out */ float& wages )      // Wages earned

// CalcPay computes wages from the employee's pay rate
// and the hours worked, taking overtime into account

{
    if (hours > MAX_HOURS)                     // Is there overtime?
        wages = (MAX_HOURS * payRate) +        // Yes
                (hours - MAX_HOURS) * payRate * OVERTIME;
    else
        wages = hours * payRate;               // No
}