// Fig. 9.6: SalesPerson.cpp
// SalesPerson class member-function definitions.
#include <iostream>
#include <iomanip>
#include "SalesPerson.h" // include SalesPerson class definition
using namespace std;

// initialize elements of array sales to 0.0
SalesPerson::SalesPerson()
{
   for ( int i = 0; i < monthsPerYear; ++i )
      sales[ i ] = 0.0;
} // end SalesPerson constructor

// get 12 sales figures from the user at the keyboard
void SalesPerson::getSalesFromUser()
{
   double salesFigure; 

   for ( int i = 1; i <= monthsPerYear; ++i ) 
   {
      cout << "Enter sales amount for month " << i << ": ";
      cin >> salesFigure;
      setSales( i, salesFigure );
   } // end for
} // end function getSalesFromUser

// set one of the 12 monthly sales figures; function subtracts
// one from month value for proper subscript in sales array
void SalesPerson::setSales( int month, double amount )
{
   // test for valid month and amount values
   if ( month >= 1 && month <= monthsPerYear && amount > 0 )
      sales[ month - 1 ] = amount; // adjust for subscripts 0-11
   else // invalid month or amount value
      cout << "Invalid month or sales figure" << endl;   
} // end function setSales

// print total annual sales (with the help of utility function)
void SalesPerson::printAnnualSales()
{
   cout << setprecision( 2 ) << fixed 
      << "\nThe total annual sales are: $" 
      << totalAnnualSales() << endl; // call utility function
} // end function printAnnualSales

// private utility function to total annual sales
double SalesPerson::totalAnnualSales()
{
   double total = 0.0; // initialize total

   for ( int i = 0; i < monthsPerYear; ++i ) // summarize sales results
      total += sales[ i ]; // add month i sales to total

   return total;                   
} // end function totalAnnualSales

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