/**
 * @file scope_lifetime_practice.cpp
 * @author Jeffrey Bergamini for CS 19 Boot Camp, jeffrey.bergamini@cabrillo.edu
 *
 * Some lunchtime practice!
 */

#include <cctype>    // for `std::isprint()`
#include <fstream>   // for `std::ifstream`
#include <iostream>  // for `std::cout`

/**
 * `main()` can have parameters to access *command-line arguments* and *environment variables*.
 *
 * @param argc argument count: the number of command-line arguments (including the executable name)
 * @param argv argument values: an array of C strings containing the command-line arguments
 */
int main(int argc, char **argv) {
  // Exit with an error message if command-line arguments weren't provided:
  if (argc < 3) {
    std::cerr << "Usage: " << argv[0] << " FILE1 FILE2\n";
    return 1;  // nonzero exit status reports unsuccessful termination to the shell
  }
  // Attempt to open the two files specified as command-line arguments:
  std::ifstream f1(argv[1]);
  std::ifstream f2(argv[2]);
  if (!f1 || !f2) {
    std::cerr << "Cannot read from input file(s)\n";
    return 2;
  }
  // TODO: Find all the unique printable characters present in one file and not the other.
  // Print each unique character and its ASCII encoding, one character per line, in ascending order.
}