//DISPLAY 4.9 Nicely Nested Loops
//Determines the total number of green-necked vulture eggs
//counted by all conservationists in the conservation district.
#include <iostream>
using namespace std;

int getOneTotal();
//Precondition: User will enter a list of egg counts
//followed by a negative number.
//Postcondition:returns a number equal to the sum of all the egg counts.

int main( )
{
cout << "This program tallies conservationist reports\n"
<< "on the green-necked vulture.\n"
         << "Each conservationist's report consists of\n"
         << "a list of numbers. Each number is the count of\n"
         << "the eggs observed in one"
         << " green-necked vulture nest.\n"
         << "This program then tallies"
         << " the total number of eggs.\n";

    int numberOfReports;
    cout << "How many conservationist reports are there? ";
    cin >> numberOfReports;

    int grandTotal = 0, subtotal, count;
    for (count = 1; count <= numberOfReports; count++)
    {
        cout << endl << "Enter the report of "
             << "conservationist number " << count << endl;
        subtotal = getOneTotal ();
        cout << "Total egg count for conservationist "
             << " number " << count << " is "
             << subtotal << endl;
        grandTotal = grandTotal + subtotal;
    }

    cout << endl << "Total egg count for all reports = "
         << grandTotal << endl;

    return 0;
}


//Uses iostream:
int getOneTotal()
{
	int total;
    cout << "Enter the number of eggs in each nest.\n"
         << "Place a negative integer"
         << " at the end of your list.\n";

    total = 0;
    int next;
    cin >> next;
    while (next >= 0)
    {
        total = total + next;
        cin >> next;
  		return total;
  }
}