// goal: Demonstrate use of vector from the STL
// This program stores, in two vectors, the hours worked by several
// employees, and their hourly pay rates.
#include <iostream>
#include <iomanip>
#include <vector>    // Needed to define vectors
using namespace std;

int main()
{
   vector<int> hours;      // hours is an empty vector
   vector<double> payRate; // payRate is an empty vector
   int numEmployees;       // The number of employees
   int index;              // Loop counter

   cout << "is the vector hours empty? ";
   if (hours.empty())
     cout << "Yes! \n";
   else
     cout << "NO. \n";

   // Get the number of employees.
   cout << "How many employees do you have? ";
   cin >> numEmployees;

   // Input the payroll data.
   cout << "Enter the hours worked by " << numEmployees;
   cout << " employees and their hourly rates.\n";
   for (index = 0; index < numEmployees; index++)
   {
      int tempHours;    // To hold the number of hours entered
      double tempRate;  // To hold the payrate entered

      cout << "Hours worked by employee #" << (index + 1);
      cout << ": ";
      cin >> tempHours;
      hours.push_back(tempHours);      // Add an element to hours
      cout << "Hourly pay rate for employee #";
      cout << (index + 1) << ": ";
      cin >> tempRate;
      payRate.push_back(tempRate);  // Add an element to payRate
   }

   // Display each employee's gross pay.
   cout << "Here is the gross pay for each employee:\n";
   cout << fixed << showpoint << setprecision(2);
   for (index = 0; index < hours.size(); index++)
   {
       // the .at function returns the value at location index
       // it works the same as [ ] however it cannot modify the value
       // and it does check for "out of bounds" error
      double grossPay = hours[index] * payRate.at(index);
      cout << "Employee #" << (index + 1);
      cout << ": $" << grossPay << endl;
   }
   // the .size function tells the number of elts in a vectore
   cout << "the number of elts in vector hours is: " << hours.size() << ". ";
   if (hours.empty())
     cout << " The array is empty.\n";
   else
     cout << "The array is not empty. \n";

   return 0;
}