`setprec'
---------

setprec([N])
     :: Sets the precision for bigfloat operations to N digits.

RETURN
     integer

N
     integer

   * When an argument is given, it sets the precision for bigfloat
     operations to N digits.  The return value is always the previous
     precision in digits regardless of the existence of an argument.

   * Bigfloat operations are done by PARI. (*Note pari::.)

   * This is effective for computations in bigfloat.  Refer to `ctrl()'
     for turning on the `bigfloat flag.'

   * There is no upper limit for precision digits.  It sets the
     precision to some digits around the specified precision.
     Therefore, it is safe to specify a larger value.

     [1] setprec();
     9
     [2] setprec(100);
     9
     [3] setprec(100);
     96

     *Note `ctrl': ctrl, *Note `eval deval': eval deval, *Note `pari':
     pari.

