Names:

doubledouble, DD represents a number as the sum of two IEEE doubles.

Description:

Example 1:

   > verbosity=1!;
   > a = 1+ 2^(-100);
   > DD(a);
   1.0000000000000000000000000000007888609052210118054
   > prec=50!;
   > DD(a);
   Warning: double rounding occurred on invoking the double-double rounding operator.
   Try to increase the working precision.
   1
See also: single, double, doubleextended, tripledouble, roundcoefficients, implementpoly, round