// Lab 5 - cookies.cpp  
// This program finds the average number of boxes of cookies 
// sold by the children in a particular scout troop. 
// It illustrates the use of a counter, an accumulator, 
// and an end sentinel.
// Llewellyn van der Merwe
#include <iostream>
#include <iomanip>

using namespace std;

int main()
{   
   int numBoxes,         // Number of boxes of cookies sold by one child
       totalBoxes,       // Accumulates total boxes sold by the entire troop
       numSeller;        // Counts the number of children selling cookies
       
   double averageBoxes;  // Average number of boxes sold per child
   
   // WRITE CODE TO INITIALIZE THE totalBoxes ACCUMLATOR TO 0 AND
   // THE numSeller COUNTER TO 1.
   totalBoxes = 0;
   numSeller = 1;
   
   cout << "             **** Cookie Sales Information **** \n\n";
   
   // Get the first input
   cout << "Enter number of boxes of cookies sold by seller " << numSeller
        << " (or -1 to quit): ";
   cin  >> numBoxes;
   
   // WRITE CODE TO START A while LOOP THAT LOOPS WHILE numBoxes
   // IS NOT EQUAL TO -1 THE SENTINEL VALUE.
   while (numBoxes != -1)
   {
      // WRITE CODE TO ADD numBoxes TO THE totalBoxes ACCUMULATOR.
      if (numBoxes > 0) {
          totalBoxes += numBoxes;
          // WRITE CODE TO ADD 1 TO THE numSeller COUNTER.
          numSeller++;
      }
      // WRITE CODE TO PROMPT FOR AND INPUT THE NUMBER OF BOXES
      // SOLD BY THE NEXT SELLER.
      cout << "Enter number of boxes of cookies sold by seller " << numSeller
           << " (or -1 to quit): ";
      cin  >> numBoxes;
   }
   // WHEN THE LOOP IS EXITED, THE VALUE STORED IN THE numSeller COUNTER
   // WILL BE ONE MORE THAN THE ACTUAL NUMBER OF SELLERS. SO WRITE CODE
   // TO ADJUST IT TO THE ACTUAL NUMBER OF SELLERS.
   numSeller--;
   // Check that we do have correct numberBoxes
   if (numSeller == 0)
       cout << "\nNo boxes were sold.\n";
   else {  // WRITE CODE TO ASSIGN averageBoxes THE COMPUTED AVERAGE NUMBER
       // OF BOXES SOLD PER SELLER.
       averageBoxes = (double) totalBoxes / numSeller;
       // WRITE CODE TO PRINT OUT THE NUMBER OF SELLERS AND AVERAGE NUMBER
       // OF BOXES SOLD PER SELLER.
       cout << "The average number of boxes sold by the " << numSeller << " sellers was "
            << std::fixed << std::setprecision(1) << averageBoxes;
   }
   
   return 0;
}