function exact = p15_exact ( )

%*****************************************************************************80
%
%% P15_EXACT returns the estimated integral for problem 15.
%
%  Licensing:
%
%    This code is distributed under the GNU LGPL license.
%
%  Modified:
%
%    29 August 2007
%
%  Author:
%
%    John Burkardt
%
%  Parameters:
%
%    Output, real EXACT, the estimated value of the integral.
%
  exact = - pi * log ( 10.0 ) / 20.0;

  return
end
