#include <cstdlib>
#include <iostream>
#include <fstream>
#include <sstream>
using namespace std;

int main(int argc, char *argv[])
{
    ofstream outStream ("result.txt");
    outStream << "Results:" << endl;

    string current_text;
    int current_int;

    ifstream inStream ("example.txt");

    if(inStream.is_open()) {
          // Einlesen kann losgehen...                 
          
          while(!inStream.eof()) {
                 getline(inStream, current_text);
                 cout << current_text << endl;
                 
                 // Convert to int
                 istringstream(current_text) >> current_int;

                 outStream << 2 * current_int << endl;
          } 
          
          

          /*
          // Geht auch so...          
          while (inStream >> current_text) {
                cout << current_text << endl;
                
                // Convert to int
                istringstream(current_text) >> current_int;

                outStream << 2 * current_int << endl;
          }               
          */
    }
    else {
         cout << "Error while opening file!" << endl;
    }
    
    outStream.close();
    
     
    system("PAUSE");
    return EXIT_SUCCESS;
}