On 08/22/2015 09:42 AM, R0b0t1 wrote: > https://en.wikipedia.org/wiki/Round-off_error > https://en.wikipedia.org/wiki/Machine_epsilon > > Either add a tolerance (a - b <= t) or compare them as strings as > you've been doing. >
You probably want |a - b| <= t there =) But... that can cause problems too. If your numbers are small enough, you can wind up with infinity or NaN (not a number) and then your comparisons will go berserk. Floating point addition isn't even commutative: > 0.1 + 0.2 + 0.3 0.6000000000000001 > 0.1 + (0.2 + 0.3) 0.6 Better to avoid that quagmire entirely if you can. Use fixed point arithmetic, arbitrary precision, or even rational numbers if you can get away with it.
