Command line arguments in C++17 using a vector.

cpsc120_command_line_arguments.cc

// Gist https://gist.github.com/ed20598a5ccf74be58e34a18e3379ff0

#include <iostream>
#include <string>
#include <vector>

int main(int argc, char const* argv[]) {
  std::vector<std::string> command_line_arguments{argv, argv + argc};
  std::cout << "There are " << argc << " arguments on the command line.\n";
  int index{0};
  for (auto const& arg : command_line_arguments) {
    std::cout << "arg #" << index << ": \"" << arg << "\"\n";
    index = index + 1;
  }
  if (command_line_arguments.size() > 3) {
    int two_from_the_back = static_cast<int>(command_line_arguments.size()) - 2;
    try {
      std::cout << "\nThe argument at location " << 0 << " is \""
           << command_line_arguments.at(0) << "\".\n";
      std::cout << "The argument at location " << two_from_the_back << " is \""
           << command_line_arguments.at(two_from_the_back) << "\".\n";
      std::cout << "The argument at location " << command_line_arguments.size() - 1
           << " is \""
           << command_line_arguments.at(command_line_arguments.size() - 1)
           << "\".\n";
    } catch (std::exception const& e) {
      std::cout << "There was a problem retrieving the argument.\n";
      return 1;
    }
  }
  return 0;
}