text: #include <CGAL/Simple_cartesian.h>
  #include <CGAL/Surface_mesh.h>
  #include <CGAL/boost/graph/io.h>
  
  #include <iostream>
  #include <fstream>
  
  #include <boost/graph/connected_components.hpp>
  
  typedef CGAL::Simple_cartesian<double>                       Kernel;
  typedef Kernel::Point_3                                      Point;
  typedef CGAL::Surface_mesh<Point>                            Mesh;
  
  typedef boost::graph_traits<Mesh>::vertex_descriptor vertex_descriptor;
  
  int main()
  {
    Mesh sm;
    CGAL::make_quad(Point(0,0,0), Point(1,0,0),Point(1,1,0),Point(0,1,0), sm);
    CGAL::make_quad(Point(0,0,1), Point(1,0,1),Point(1,1,1),Point(0,1,1), sm);
  
    std::ofstream out("out.inp");
    out.precision(17);
    CGAL::write_inp(out, sm, "out.inp", "S4R");
    return 0;
  }
  