/*
 * Sum from 1 to an upperbound using a while-loop (SumNumbers.cpp).
 */
#include <iostream>
using namespace std;

int main() {
   int sum = 0;    // Declare an int variable sum to accumulate the numbers
                   // Set the initial sum 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) {
      sum = sum + number;   // accumulate number into sum
      ++number;             // increment number by 1
   }
   // Print the result
   cout << "The sum from 1 to " << upperbound << " is " << sum << endl;

   return 0;
}