#include <iostream>
#include <fstream>
#include <string>
#include <iterator>

int main(int argc, char** argv)
{
  {
    // close file when printer goes out of scope
    std::ofstream printer("test.txt");

    if (!printer.is_open())
    {
      std::cerr << "Error opening file for writing\n";
      exit(2);
    }

    printer << " 123 456 789 \n";
    printer << "987  865 \t  432\n";
    printer << "1garbage 211 199\n";
    printer << "666 777 888\n";
  }

  std::ifstream reader("test.txt");

  if (!reader.is_open())
  {
    std::cerr << "Error opening file for reading\n";
    exit(3);
  }

  // decalre two istream iterators, one with the file the other with end-of-stream
  // loop until the one first iterators equals the endofstream iterator
  for(std::istream_iterator<int> iter(reader), endofstream; iter != endofstream; iter++)
  {
    int tmp;
    tmp = *iter;
    std::cout << "READ int: " << tmp << "\n";

    // the "garbage" in the input will end the stream so the last int will be 1
  }

  return 0;
}