title: calling C++ function from fortran not C
body: <p>is it possible to call a C++ function from FORTRAN such as </p>
  
  <pre><code>#include &lt;iostream.h&gt;
  extern "C"
  {
      void single_cell(void)
      {
          cout&lt;&lt;"Hi from C++";
      }
  }
  </code></pre>
  
  <p>So when I am using C it is working fine but with the C++ function it gives errors like 
  Undefined error to cout  etc </p>