/*
   testrep10.cpp
   CIS 150
   6/10/2008
   David Klick
  
   Alternative to priming read.
*/

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

void cont();

int main() {
   int num;   // variable for user input
   int sum;   // accumulator
   
   // display informational message and reset sum
   cout << "Adding machine program\n";
   sum = 0;
   
   do {
      // get user entry
      cout << "Enter an integer (-999 to exit): ";
      cin >> num;
      
      // only process if not sentinel value
      if (num != -999) {
         sum += num;
      }
      
   } while (num != -999); // end when sentinel value entered
   
   // display result
   cout << "The sum is " << sum << '\n';

   cont();
   return 0;
}

void cont() {
   if (cin.rdbuf()->sungetc() != -1 && cin.get() != '\n') cin.ignore(80,'\n');
   cout << "Press enter to continue...";
   cin.get();
}

/*
   Sample output:

   Adding machine program
   Enter an integer (-999 to exit): 25
   Enter an integer (-999 to exit): 15
   Enter an integer (-999 to exit): -10
   Enter an integer (-999 to exit): -999
   The sum is 30
*/