Any idea why 10^32 = -8814407033341083648

General Usage
1

As in the topic title, I have found some strange behavior in Julia by exponentiating 10^large_number. In particular, I get negative numbers for some exponents. Also, the log function is treating these numbers as complex.

Any idea why is this happening?

Here below I report some results:

julia> 10^15 == 1e15
true

julia> 10^20 == 1e20
false

julia> 10^20 ≈ 1e20
false

julia> 10^31
-4570789518076018688

julia> 10^32
-8814407033341083648

julia> 10^33
4089650035136921600

julia> 10^31 > 0
false

julia> 10^33 > 0
true

julia> log(10^31)
ERROR: DomainError:
log will only return a complex result if called with a complex argument. Try log(complex(x)).
Stacktrace:
 [1] nan_dom_err at ./math.jl:300 [inlined]
 [2] log at ./math.jl:419 [inlined]
 [3] log(::Int64) at ./math.jl:421

If I try the same on MATLAB I get

>> 10^32 == 1e32

ans =

  logical

   1

>> 10^32

ans =

   1.0000e+32

I am on ubuntu 16.04 and Julia 0.6.3

2

https://docs.julialang.org/en/stable/manual/integers-and-floating-point-numbers/#Overflow-behavior-1

3

Thanks a lot for the quick answer!