// program to print the sum of the digits in an entered number.
#include <iostream>
using namespace std;

int main()
{
   int number;
   int sum;
   int digit;

   cout << "Enter a positive number -- ";
   cin >> number;

   cout << "The sum of the digits of " << number << " is ";

   // use remainder and divide to get the digits one at a time and sum them
   // Note the last digit can be obtained by finding the remainder when
   // the number is divided by 10. We can then divide the number by 10 to
   // remove the last digit. We will repeat this until the number is 0
   sum = 0;
   while (number > 0) {
      digit = number % 10;
      sum = sum + digit;
      number =  number / 10;
   }

   cout << sum << endl;

   return 0;
}