#include <fstream>
#include <ios>
#include <iostream>
#include <string>

int main(int argc, char **argv)
{
  if (argc != 2)
  {
    std::cout << "usage: ./filesize <file> \n";
    return 1;
  }
  std::string name = argv[1];
  std::ifstream file(name, std::istream::ate);
  if (!file.is_open())
  {
    std::cout << "couldnt open file!";
  }
  std::streamsize size = file.tellg();
  std::cout << size << " bytes" << std::endl;
  return 0;
}