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

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

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

    // Get the sales data for all quarters.
    getSales(sales, QUARTERS);

    // Set the numeric output formatting.
    cout << setprecision(2);
    cout << fixed << showpoint;

    // Display the total sales for the year.
    cout << endl << "The total sales for the year are $";
    cout << totalSales(sales, QUARTERS) << endl;
    return 0;
}

//*****************************************************************
// Definition of getSales. This function uses a pointer to accept *
// the address of an array of doubles. The number of elements in  *
// in the array is passed as a separate integer parameter. The    *
// The function asks the  user to enter the sales figures for     *
// four quarters, then stores those figures in the array using    *
// subscript notation.                                            *
//*****************************************************************

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 of doubles whose size is      *
// is passed as a separate parameter. The function uses pointer *
// notation to sum the elements of the array.                   *
//***************************************************************

double totalSales(double *array, int size)
{
    double sum = 0.0;

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