Re: ROUND function source for IEEE-754

Gerard Zagema wrote:
> 
> No, I'm talking about ROUND(number,precision).
> 
> This function will round a float to the precision given by
> 'precision'. If precision is 2 then 525.345 will give 525.35 and
> with a precision of -2, ROUND( 9856.0 , -2) will give 9900.
> 
> I already found the code but it's a lot of div. and mul.. I was
> hoping that there is a smart way to do it when the number format
> ( such as IEEE-754)  is known.

If you had had the courtesy to quote something to indicate to what
you were replying, you would have also seen the following:

> > You can build your ROUND function from this with some
> > multiplications and divisions.

together with a description of the round() function.

An elementary consideration of the operations required, and the
internal data formats, would show you that such short cuts are not
available.  If ISO C adds the proposed decimal floating point
formats, that situation will change.  Don't hold your breath for
it.

-- 
Chuck F ([EMAIL PROTECTED]) ([EMAIL PROTECTED])
   Available for consulting/temporary embedded and systems.
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