Common-Description:
 The MPFR library is a C library for multiple-precision floating-point
 computations with correct rounding.  The main goal of MPFR is to provide a
 library for multiple-precision floating-point computation which is both
 efficient and has a well-defined semantics.  It copies the good ideas from the
 ANSI/IEEE-754 standard for double-precision floating-point arithmetic (53-bit
 significand).