function value = r8_pi

%*****************************************************************************80
%
%% R8_PI returns the value of pi.
%
%  Licensing:
%
%    This code is distributed under the GNU LGPL license. 
%
%  Modified:
%
%    20 July 2004
%
%  Author:
%
%    John Burkardt
%
%  Parameters:
%
%    Output, real VALUE, the value of pi.
%
  value = 3.14159265358979323846264338327950288419716939937510;

  return
end