double precision or what?

**jacek** · 20th February 2007, 12:46

Originally Posted by mickey

what do I have to do if I need that high precision in C++? nothing?

Write a high-precision number class or use some library.

**mickey** · 20th February 2007, 17:18

the problem isn't only that 3.00000000001 but others too. And with operations error is propagating (increase)...Any hints about library?
thankks

**wysota** · 20th February 2007, 20:01

Originally Posted by mickey

the problem isn't only that 3.00000000001 but others too. And with operations error is propagating (increase)...

As long as it keeps under the number of significant digits you need, you have nothing to worry about.

As for the lib, try this one: http://www.nongnu.org/hpalib

Or this one: http://freshmeat.net/projects/ccmath/

In any case, google is your friend.