Julia: Float rounding issue

[plashchynski]

The expression

(2/6)^5 == 2^5 / 6^5

is false? This language is intended to be good at Math. Ruby and Python both evaluated it to true.

version 1.4.1

[StefanKarpinski]

Standard floating-point behavior. Python3:

>>> (2/6)**5
0.004115226337448558
>>> 2**5 / 6**5
0.00411522633744856
>>>

Julia:

julia> (2/6)^5
0.004115226337448558

julia> 2^5 / 6^5
0.00411522633744856

In Python2 and Ruby they're equal because both sides are zero since / does integer division.

[simonbyrne]

Use rationals:

julia> (2//6)^5 == 2^5 // 6^5
true