// C++'s iostream declares stream objects cin, cout, etc.,
// but within the 'std' namespace.  Note that you can't
// use the .h suffix when you're #including headers from the
// C++ standard library (but you do need them when including
// a local header, e.g., #include "ll.h")
#include <iostream>

// We want to include C's header file stdlib.h.
// To include a C standard library header foo.h
// in a C++ program, you use #include <cfoo>
#include <cstdlib>

int main(int argc, char **argv) {
  // "std::cout" means "the symbol 'cout' scoped to the 'std'
  // namespace.  It is an object of type ostream.
  // "<<" is an operator, defined by the ostream class.
  // "endl" is a 'manipulator' function defined in "std".  This
  // function operates on an ostream to flush the stream and
  // write a newline character.
  std::cout << "Hello, World!" << std::endl;
  return EXIT_SUCCESS;
}