function [ node_file_name, element_file_name ] = ... 
  file_name_specification ( node_file_name, element_file_name )

%% FILE_NAME_SPECIFICATION determines the names of the input files.
%
%  Licensing:
%
%    This code is distributed under the GNU LGPL license.
%
%  Modified:
%
%    29 August 2006
%
%  Author:
%
%    John Burkardt
%
%  Parameters:
%
%    Input, string NODE_FILE_NAME, the name of the node file, if the user
%    supplied it on the command line.
%
%    Input, string ELEMENT_FILE_NAME, the name of the element file,
%    if the user supplied it on the command line.
%
%    Output, string NODE_FILE_NAME, the name of the node file.
%
%    Output, string ELEMENT_FILE_NAME, the name of the element file.
%
  if ( nargin < 1 ) 

    fprintf ( 1, '\n' );
    node_file_name = input ( '  Please enter the name of the node file.' );

  end

  if ( nargin < 2 )

    fprintf ( 1, '\n' );
    element_file_name = ...
      input ( '  Please enter the name of the element file.' );

  end

  return
end