Method sub

libraries/lib-string-utils/ToChars.cpp:180–184

! @brief returns x - y @pre x.e == y.e and x.f >= y.f */

   @pre x.e == y.e and x.f >= y.f
   */
   static diyfp sub(const diyfp& x, const diyfp& y) noexcept
   {

      return { x.f - y.f, x.e };
   }

   /*!
   @brief returns x * y