function exact = p47_exact ( )

%*****************************************************************************80
%
%% P47_EXACT returns the exact integral for problem 47.
%
%  Licensing:
%
%    This code is distributed under the GNU LGPL license.
%
%  Modified:
%
%    04 November 2009
%
%  Author:
%
%    John Burkardt
%
%  Parameters:
%
%    Output, real EXACT, the value of the integral.
%
  exact = - 4.0 / 9.0;

  return
end
