function value = quad_unit_volume ( )

%*****************************************************************************80
%
%% QUAD_UNIT_VOLUME: volume of a unit quadrilateral.
%
%  Discussion:
%
%    The integration region is defined as:
%
%    - 1.0 <= X <= 1.0
%    - 1.0 <= Y <= 1.0
%
%  Licensing:
%
%    This code is distributed under the GNU LGPL license.
%
%  Modified:
%
%    17 April 2009
%
%  Author:
%
%    John Burkardt
%
%  Parameters:
%
%    Output, real VALUE, the volume.
%
  value = 4.0;

  return
end