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


Example 1:

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