text: #include <sharg/all.hpp>
  
  int main(int argc, char ** argv)
  {
      sharg::parser myparser{"Grade-Average", argc, argv}; // initialize
  
      std::string name{"Max Muster"}; // define default values directly in the variable.
      bool bonus{false};
      std::vector<double> grades{}; // you can also specify a vector that is treated as a list option.
  
      myparser.add_option(name, 'n', "name", "Please specify your name.");
      myparser.add_flag(bonus, 'b', "bonus", "Please specify if you got the bonus.");
      myparser.add_positional_option(grades, "Please specify your grades.");
  
      try
      {
          myparser.parse();
      }
      catch (sharg::parser_error const & ext) // the user did something wrong
      {
          std::cerr << "[PARSER ERROR] " << ext.what() << '\n'; // customize your error message
          return -1;
      }
  
      if (bonus)
          grades.push_back(1.0); // extra good grade
  
      double avg{0};
      for (auto g : grades)
          avg += g;
  
      avg = avg / grades.size();
  
      std::cerr << name << " has an average grade of " << avg << '\n';
  
      return 0;
  }
  