/*
   testarr04.cpp
   CIS 150
   06/19/2008
   David Klick

   Demonstration of setting array elements from
   user input.
*/

#include <iostream>
using std::cout;
using std::cin;

void cont();

int main() {
   // common way to set array size globally
   const int ARRAY_SIZE = 10;

   double nums[ARRAY_SIZE];
   int numItems = 0;  // number of items stored in array
   int ctr;
   double sum;
   
   // get values for array from user, but don't
   //    allow array to overflow
   while (numItems < ARRAY_SIZE) {
      cout << "Enter item #" << (numItems+1)
           << " (-999 to quit): ";
      cin >> nums[numItems];
      // stop if user enters -999
      if (nums[numItems] == -999) break;
      // keeps track of how many items are in the array
      numItems++;
   }

   // skip this section if nothing was entered
   if (numItems > 0) {
      // display all items stored in array
      cout << "You entered:\n";   
      for (ctr=0; ctr<numItems; ctr++) {
         cout << "   " << nums[ctr] << '\n';
      }
   
      // add up items in array
      sum = 0.0;
      for (ctr=0; ctr<numItems; ctr++) {
         sum += nums[ctr];
      }
      // use sum to calculate and display average
      cout << "The average is " << (sum/numItems) << '\n';
   }
   
   cont();
   return 0;
}

/*
   void cont();
   
   Arguments: none
   
   Returns: nothing
   
   Clears input buffer and pauses waiting for user 
   to press Enter.
*/
void cont() {
   if (cin.rdbuf()->sungetc() != -1 && cin.get() != '\n') cin.ignore(80,'\n');
   cout << "Press enter to continue...";
   cin.get();
}

/*
   Sample output:
   
   Enter item #1 (-999 to quit): 42.7
   Enter item #2 (-999 to quit): 32
   Enter item #3 (-999 to quit): 12.0
   Enter item #4 (-999 to quit): -999
   You entered:
      42.7
      32
      12
   The average is 28.9
*/