text: #include <iostream>
  #include <cstdlib>
  
  #include "demolib2.h"
  
  int main(int argc, char* argv[]) {
      std::cout << argc << ": " << argv[0] << " " << argv[1] << std::endl;
      if (argc != 2) {
          std::cerr << "Should be one argument!" << std::endl;
          return 1;
      }
      int n = atoi(argv[1]);
      demo_lib2_print_fibonacci(n);
      return 0;
  }
  