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

// The arguments to main will be the number of arguments on the command
// lines (the name of the program is considered an argument) and an
// array of C-style character strings containing the arguments.
// The first one, argv[0], wille always be the program's name.

int main(int argc, char * argv[])
{
  // Check that exactly two things were typed on the command line:
  // the command and a filename.  Print an error and exit if not.
  // The convention is to return a non-zero value when an error occurs.
  if (argc != 2) 
  {
    std::cerr << "Usage: " << argv[0] << " <filename>" << std::endl;
    exit(1);
  }

  // Open the file typed on the command line as a stream.  If this
  // fails (for example, because the file does not exist), print
  // an error and exit.
  std::ifstream input(argv[1]);
  if (!input) 
  {
    std::cerr << "Can't open file: " << argv[1] << std::endl;
    exit(1);
  }

  // Read all the strings in the file and print them out.
  // The loop will terminate when we reach the end of the file.
  std::string s;
  while (input >> s)
    std::cout << "Read string: " << s << std::endl;
}