//-------------------------------------------------------------------------------
// CS 112 Fall 2008
// Program Assignment #6
// Purpose: To help a company tally their employee expense data and 
//          produce an Expense Summary Report.
// Due Date: 5 December 2008
// Written by: L'Tia King
//-------------------------------------------------------------------------------

#include <iostream>
#include <iomanip>
using namespace std;

const int MAXEMPLOYEES = 30;    // there are at most 30 employees 

//-------------------------------------------------------------------------------
// InitializeArrays sets the contents of both arrays to zero
//-------------------------------------------------------------------------------
// Accepts: the number of employees
// Returns: both the expenses array and the expensecounts array
//-------------------------------------------------------------------------------      

void InitializeArrays (float expenses [],
                         int expensecounts [],
                         int numemployees)

{
for (int i = 0; i < numemployees; i ++)
 {
  expenses [i] = 0;
  expensecounts [i] = 0;
 }
}

//-------------------------------------------------------------------------------
// TallyExpense inputs the "expense slips" from the data file and tallies 
//              them into the arrays
//-------------------------------------------------------------------------------
// Accepts: the data file	
// Returns: returns the expenses and the number of expenses 
//-------------------------------------------------------------------------------

void TallyExpenses (float expenses [],
                      int expensecounts [],
                      int numemployees)
{

float empexpense;   // employee expenses
  int empid;        // employee id number 

cin >> empid;

  while (empid >= 0)
  {

    cin >> empexpense;

    expensecounts [empid] ++;
    expenses [empid] += empexpense;

    cin >> empid;

  }
} 


//-------------------------------------------------------------------------------
// ReportExpenses uses the arrays from TallyExpenses to produce an Expense 
//                Summary Report
//-------------------------------------------------------------------------------
// Accepts: both the expenses array and the expensecounts array
//-------------------------------------------------------------------------------

void ReportExpenses (float expenses [],
                       int expensecounts [],
                       int numemployees)

{

float avgexp,          // average expense
      minexp = 5000,   // minimum expense
      totalexp = 0;    // total of all expenses 
  int totalnum = 0,    // total number expenses
      empid,           // employee id number
      empidmin;        // employee with minimum expenses

cout << "                  Expense Summary Report \n\n";
cout << "Employee Id    # of Expenses     Expense Total    Average Expense\n\n";

  for(int i = 0; i < numemployees; i++)
   {
     cout << fixed << setprecision (2);
     
     // Find the total number of expenses for each employee

          totalnum += expensecounts [i];

     // Calculate the total expense amounts for each employee

          totalexp += expenses [i];

     // Calculate the average expense of each total expense
 
          avgexp = expenses [i] / expensecounts [i];
    
     cout << setw(7) <<  i << setw(16) << expensecounts [i];
     cout << setw(14) << " $ " << setw(7) << expenses [i];
     cout << setw(11) << " $ " << setw(7) << avgexp << endl;    
     
     if (expenses [i] < minexp)
        {
          minexp = expenses [i];
          empidmin = i;
        } 

   }

 cout << "\nTotals" << setw(17) << totalnum <<setw(13) << "$";
 cout << setw(8) << totalexp << endl;

        cout << "\nCongratulations to employee number " << empidmin;
        cout << " who had the lowest total expense amount!"; 
  

   
}



//-------------------------------------------------------------------------------
// Main function
//-------------------------------------------------------------------------------

int main ()
{

// --- Variables

float expenses [MAXEMPLOYEES];       // tallies the expense amounts
  int expensecounts [MAXEMPLOYEES],  // tallies the expense counts
      numemployees;                  // holds the actual number of employees

// Get the actual number of employees

cin >> numemployees;

// First set the contents of both arrays to zero

InitializeArrays (expenses, expensecounts, numemployees);

// Next input the "expense slips" and tally them  

TallyExpenses (expenses, expensecounts, numemployees);

// Then produce the report

ReportExpenses (expenses, expensecounts, numemployees);

cout << "\n\n";
return 0;

}