Float Comparison Returns False

[bearophile]

Loopback:

> I do want to ask though what an alternative would be in this case, to
> compare the two different values. You mentioned something about
> "epsilons" but I have no experience within this field. I would really
> appreciate an example or something similar so I could understand your
> statement.

If you want to use floating point values in your programs then you probably need to know something about floating point representation. This is a good starting point:
http://en.wikipedia.org/wiki/Floating_point
For your problem there is the feqrel function:
http://www.digitalmars.com/d/2.0/phobos/std_math.html#feqrel


>  From what I can see these are two identical values, I would be more than
> glad if someone could explain just what is the difference between these
> two "non-equal" values and how make them "equal". Perhaps I should use
> ints and long instead since they don't seem to suffer from this
> "problem"?

Generally in a program you use floating point values only if you can't use integral values (and you don't want to go toward fixed point values, rationals, etc).

Bye,
bearophile