use argc/argv to pass the argument

BGL/examples/BGL_polyhedron_3/distance.cmd

@@ -0,0 +1 @@
+cube.off

BGL/examples/BGL_polyhedron_3/distance.cpp

@@ -18,12 +18,10 @@ typedef boost::graph_traits<Polyhedron>::vertex_iterator   vertex_iterator;
 
 
 
-int main() {
+int main(int argc, char** argv) {
 
   Polyhedron P;  
-  
+  std::ifstream in(argv[1]);
-  std::ifstream in("cube.off");
-  
   in >> P ;
   
   // associate indices to the vertices using the "id()" field of the vertex.

BGL/examples/BGL_polyhedron_3/incident_vertices.cmd

@@ -0,0 +1 @@
+cube.off

BGL/examples/BGL_polyhedron_3/incident_vertices.cpp

@@ -46,10 +46,10 @@ adjacent_vertices_V2(const Polyhedron& g,
 }
 
 
-int main()
+int main(int argc, char** argv)
 { 
+  std::ifstream in(argv[1]);
   Polyhedron P;
-  std::ifstream in("cube.off");
   in >> P;
   GraphTraits::vertex_iterator vi = vertices(P).first;
   std::list<vertex_descriptor> V;

BGL/examples/BGL_polyhedron_3/normals.cmd

@@ -0,0 +1 @@
+cube.off

BGL/examples/BGL_polyhedron_3/normals.cpp

@@ -69,18 +69,16 @@ void calculate_face_normals(const HalfedgeGraph& g,
   }
 }
 
-int main()
+int main(int argc, char** argv)
 {
   typedef boost::property_map< 
     Polyhedron,
     CGAL::face_index_t 
     >::const_type Face_index_map;
 
+  std::ifstream in(argv[1]);
   Polyhedron P;
-  {
-    std::ifstream in("cube.off");
   in >> P ;
-  }
   
   // initialize facet indices
   std::size_t i = 0;

BGL/examples/BGL_polyhedron_3/transform_iterator.cmd

@@ -0,0 +1 @@
+cube.off

BGL/examples/BGL_polyhedron_3/transform_iterator.cpp

@@ -38,10 +38,11 @@ struct Source {
   }
 };
 
-int main()
+int main(int argc, char** argv)
 { 
+  std::ifstream in(argv[1]);
   Polyhedron P;
-  std::cin >> P;
+  in >> P;
   GraphTraits::vertex_descriptor vd = *(vertices(P).first);
 
   typedef boost::transform_iterator<Source<Polyhedron>,halfedge_around_target_iterator> adjacent_vertex_iterator;