Re: [julia-users] Re: overflow behavior
On Tue, Apr 5, 2016 at 10:50 AM, Páll Haraldsson wrote: > On Tuesday, April 5, 2016 at 2:45:38 PM UTC, Didier Verna wrote: >> >> >> Hello, >> >> the manual says: "In Julia, exceeding the maximum representable value of >> a given type results in a wraparound behavior:", but that seems to be >> the case only for the native type and above: >> >> julia> typeof(typemax(Int64) + 1) -> Int64 >> julia> typeof(typemax(Int128) + 1) -> Int128 >> >> but: >> >> julia> typeof(typemax(Int8) + 1) -> Int64 >> julia> typeof(typemax(Int16) + 1) -> Int64 >> julia> typeof(typemax(Int32) + 1) -> Int64 > > > Right, the manual could be updated, I guess. The last one, gives you Int32 > on 32-bit platforms. This i all intentional. Then there is Int128 and BigInt > (no modular there). `Int128` does use modulus semantics. -erik >> These last 3 results seem inconsistent (and the manual incorrect) >> because for example, typeof(typemax(Int8)) -> Int8 and not Int64, so no, >> Julia doesn't do modular arithmetics all the time. >> >> -- >> Resistance is futile. You will be jazzimilated. >> >> Lisp, Jazz, Aïkido: http://www.didierverna.info -- Erik Schnetter http://www.perimeterinstitute.ca/personal/eschnetter/
Re: [julia-users] Re: overflow behavior
Páll Haraldsson wrote: > Right, the manual could be updated, I guess. The last one, gives you > Int32 on 32-bit platforms. I expected as much, indeed. -- Resistance is futile. You will be jazzimilated. Lisp, Jazz, Aïkido: http://www.didierverna.info
[julia-users] Re: overflow behavior
On Tuesday, April 5, 2016 at 2:45:38 PM UTC, Didier Verna wrote: > > > Hello, > > the manual says: "In Julia, exceeding the maximum representable value of > a given type results in a wraparound behavior:", but that seems to be > the case only for the native type and above: > > julia> typeof(typemax(Int64) + 1) -> Int64 > julia> typeof(typemax(Int128) + 1) -> Int128 > > but: > > julia> typeof(typemax(Int8) + 1) -> Int64 > julia> typeof(typemax(Int16) + 1) -> Int64 > julia> typeof(typemax(Int32) + 1) -> Int64 > Right, the manual could be updated, I guess. The last one, gives you Int32 on 32-bit platforms. This i all intentional. Then there is Int128 and BigInt (no modular there). > > These last 3 results seem inconsistent (and the manual incorrect) > because for example, typeof(typemax(Int8)) -> Int8 and not Int64, so no, > Julia doesn't do modular arithmetics all the time. > > -- > Resistance is futile. You will be jazzimilated. > > Lisp, Jazz, Aïkido: http://www.didierverna.info >
