OpenEuphoria

RE: BUG! Erratic for loop behavior

• Posted by Chris Bensler <bensler at mail.com> Mar 24, 2002
• 466 views

I just did some further testing, and it seems that magnifying a decimal 
value doesn't help either.

? magnify(0.12345678901) = 12345678901 -- 0
? magnify(0.12345678901) = 123456789   -- 0
? magnify(0.12345678901) = 12345679    -- 0

This seems like a devastating problem. We use fractional numbers all the 
time. How is it possible that it doesn't show up more often?

Do we need to resort to binary math? Would that even help?

What can be done to ensure that my program is calculating the math 
properly?


Chris


Chris Bensler wrote:
> How does atom_to_float help?
> 
> 
> sequence x     x= atom_to_float32(0.1)
> 
> ? x
> ? float32_to_atom(x+x+x+x+x+x+x+x+x+x)
> 
> 
> How do other languages deal with the general use of decimals?
> 
> Chris
> 
> Andy Serpa wrote:
> > > .1 + .1 + .1 + .1 + .1 + .1 + .1 + .1 + .1 does not equal 1 -- just try 
> > > it.  It will display as one if you print it, but if you do this:
> > > 
> > > x = .1 + .1 + .1 + .1 + .1 + .1 + .1 + .1 + .1 
> > 
> > Oops.  One ".1" short, but you get the point...
> > 
> >