C++ mpf_class Precision

[Torbjorn Granlund]

Henry <henryxxll at gmail.com> writes:

  What if I base the assignment of an mpf_class variable on another mpf_class
  variable, like so:
  
  *mpf_class a, b;
  a="1.123456789123456789123456789";
  b=a*2;
  *
  Would it still round it incorrectly?
  
There is no incorrect rounding going on, the behaviour you saw follows
from the C++ language.  The semantics of mpf_class are documented in the
GMP manual.

-- 
Torbjörn