//---------------------------------------------------
// Purpose: Program to calculate magic numbers
// Author:  John Gauch
//---------------------------------------------------
#include <iostream>
using namespace std;

// Function to calculate magic number
int Magic(const int Number)
{
   // Get digits and calculate sum
   int Digit1, Digit2, Digit3, Digit4, Digit5;
   Digit1 = (Number / 10000);
   Digit2 = (Number % 10000) / 1000;
   Digit3 = (Number % 1000) / 100;
   Digit4 = (Number % 100) / 10;
   Digit5 = (Number % 10);
   return (Digit1 + Digit2 + Digit3 + Digit4 + Digit5);
}

// Main body of program
int main()
{
   // Get user input
   int Input, Output;
   cout << "Enter number in [0..99999] range: ";
   cin >> Input;

   // Do error checking
   if ((Input < 0) || (Input > 99999))
      cout << "Number must be in [0..99999]" << endl;

   // Calculate magic number and print results
   else
   {
      cout << "Input = " << Input << endl;
      Output = Magic(Input);
      cout << "Output = " << Output << endl;
      while (Output > 9)
      {
         Output = Magic(Output);
         cout << "Output = " << Output << endl;
      }
   }
   return 0;
}