looks like if you make any(or both) to double it works as expected due to
these being called:
static public double multiply(double x, double y){
return x * y;
}
static public double multiply(double x, long y){
return x * y;
}
static public double multiply(long x, double y){
return x * y;
}
=> (unchecked-multiply (double 25214903917) 25214903917)
6.35791379543542E20
=> (unchecked-multiply (double 25214903917) (double 25214903917))
6.35791379543542E20
=> (unchecked-multiply 25214903917 (double 25214903917))
6.35791379543542E20
but it didn't overflow:
=> (= 25214903917.0 (/
(unchecked-multiply 25214903917 (double 25214903917))
25214903917))
true
but this did:
=> (= 123E300
(/
(unchecked-multiply
123E300
(double
123E300))
123E300))
false
=> 123E300
1.23E302
=> *clojure-version*
{:major 1, :minor 5, :incremental 0, :qualifier "RC16"}
So, given my prev. post, it's apparently a bug in clojure? with the
unchecked-multiply if any of the params(or both) is "object" when compared
to when they're both "primitive" aka Long.
On Wed, Feb 20, 2013 at 11:40 PM, AtKaaZ <[email protected]> wrote:
>
> looks like different methods are called:
>
> for: user=> (unchecked-multiply 25214903917 0x5DEECE66D)
> this method: static public long unchecked_multiply(long x, long y){return
> x * y;}
>
>
> for: (unchecked-multiply seed1 0x5DEECE66D)
> this method: static public Number unchecked_multiply(long x, Object
> y){return multiply(x,y);}
>
> long story short this gets called:
> static public long multiply(long x, long y){
> long ret = x * y;
> if (y != 0 && ret/y != x)
> return throwIntOverflow();
> return ret;
> }
>
>
> On Wed, Feb 20, 2013 at 11:25 PM, John Lawrence Aspden <
> [email protected]> wrote:
>
>> Hi, I'm getting an unexpected exception trying to do unchecked
>> arithmetic:
>>
>> user=> (def seed1 25214903917)
>> #'user/seed1
>> user=> (type seed1)
>> java.lang.Long
>> user=> (type 25214903917)
>> java.lang.Long
>> user=> (unchecked-multiply seed1 0x5DEECE66D)
>> ArithmeticException integer overflow
>> clojure.lang.Numbers.throwIntOverflow (Numbers.java:1388)
>>
>> user=> (unchecked-multiply 25214903917 0x5DEECE66D)
>> 8602081037417187945
>>
>> Could someone explain what's going on for me?
>>
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>
>
> --
> Please correct me if I'm wrong or incomplete,
> even if you think I'll subconsciously hate it.
>
>
--
Please correct me if I'm wrong or incomplete,
even if you think I'll subconsciously hate it.
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