On 2011-07-07 17:28, bearophile wrote: > 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).
What Every Computer Scientist Should Know About Floating-Point Arithmetic: http://download.oracle.com/docs/cd/E19957-01/806-3568/ncg_goldberg.html - Jonathan M Davis
