Re: [Boost-users] [lexical_cast] float-to-string rounding error (notfound with cout)

On Thu, Apr 30, 2009 at 12:20 PM, Peter Dimov wrote:

...

(1) Is there a way to eliminate this trailing '1' with lexical_cast (presumably some wierd rounding error)?

Try this code:

  std::cout << f2 << std::endl;   std::cout << boost::lexical_caststd::string(f2) << std::endl;

  std::cout << f - f2 << std::endl;

which will hopefully answer your question.

The resulting output from your code, Peter, is: 123.123 123.123001 123.123 123.123001 0 That's just great. So internally (on my system, anyway) the two floats are equal, and the two methods of converting it to string just round it differently. Curses. Thanks for the help -Grant