> > In C++ you could create you own floating point class with 
> functions that
> > do this. The use would be the same as the normal float and 
> doubles. No
> > new language needed.
> 
> And how do you handle the 
> precision of any 
> non-rational numbers Like PI for example ? Or anything that is not 
> rational in the base you are using for calculations ?

In the obvious way. When you in any way create a normal (float) constant
you must supply its value. When you create a constant for this datatype,
let's call it float-with-uncertainty, you must suplly its middle value
and its uncertanty. So you can't just

   float_with_uncertanty x = (1, 0);
   x = x * 3.14;

because 3.14 is not a float_with_uncertanty. but you could

   float_with_uncertanty x;
   x = x * float_with_uncertanty( 3.14, 0.005 );

Wouter van Ooijen

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