/*
 * Sum the odd and even numbers from 1 to an upperbound (SumOddEven.cpp)
 */
#include <iostream>
using namespace std;

int main() {
   int sumOdd  = 0; // For accumulating odd numbers, init to 0
   int sumEven = 0; // For accumulating even numbers, init to 0
   int upperbound;  // Sum from 1 to this upperbound

   // Prompt user for an upperbound
   cout << "Enter the upperbound: ";
   cin >> upperbound;

   // Use a loop to repeatedly add 1, 2, 3,..., up to upperbound
   int number = 1;
   while (number <= upperbound) {
      if (number % 2 == 0) {  // even number
         sumEven = sumEven + number;
      } else {                // odd number
         sumOdd = sumOdd + number;
      }
      ++number; // increment number by 1
   }

   // Print the results
   cout << "The sum of odd numbers is " << sumOdd << endl;
   cout << "The sum of even numbers is " << sumEven << endl;
   cout << "The difference is " << (sumOdd - sumEven) << endl;

   return 0;
}