// This program demonstrates that a pointer may be used as a
// parameter to accept the address of an array. 
#include <iostream>
#include <iomanip>
using namespace std;

// Function prototypes
void getSales(double *, int);
double totalSales(double *, int);

int main()
{
   const int QTRS = 4;
   double sales[QTRS];

   // Get the sales data for all quarters.
   getSales(sales, QTRS);
   
   // Set the numeric output formatting.
   cout << fixed << showpoint << setprecision(2);
   
   // Display the total sales for the year.
   cout << "The total sales for the year are $";
   cout << totalSales(sales, QTRS) << endl;
   return 0;
}

//*****************************************************************
// Definition of getSales. This function uses a pointer to accept *
// the address of an array of doubles. The function asks the user *
// user to enter sales figures and stores them in the array.      *
//*****************************************************************
void getSales(double *array, int size)
{
   for (int count = 0; count < size; count++)
   {
      cout << "Enter the sales figure for quarter ";
      cout << (count + 1) << ": ";
      cin >> array[count];
   }
}

//*****************************************************************
// Definition of totalSales. This function uses a pointer to      *
// accept the address of an array. The function returns the total *
// of the elements in the array.                                  *
//*****************************************************************
double totalSales(double *array, int size)
{
   double sum = 0.0;

   for (int count = 0; count < size; count++)
   {
      sum += *array;
      array++;
   }
   return sum;
}