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From: "bursejan" <bursejan@1:261/38.remove-i5b-this>
Newsgroups: comp.lang.java.programmer
Subject: Re: Has Android different floats?
Date: Sun, 24 Jun 2018 13:35:42 -0500
Organization: Agency News - Dunedin, New Zealand
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  To: bursejan
From: "bursejan" <bursejan@1:261/38.remove-101j-this>

  To: bursejan
From: bursejan@gmail.com

The test code would be:

        for (int i=22; i<25; i++) {
           System.out.println("Math.pow(10,"+i+")="+Math.pow(10,i));
        }

The result (without strictfp modifier to main()) is:

   Math.pow(10,22)=1.0E22
   Math.pow(10,23)=1.0000000000000001E23
   Math.pow(10,24)=1.0E24

The result (with strictfp modifier to main()) is:

   Math.pow(10,22)=1.0E22
   Math.pow(10,23)=1.0000000000000001E23
   Math.pow(10,24)=1.0E24

Because invoking Math.pow() is not a basic operator +, *, /, etc..

Am Sonntag, 24. Juni 2018 22:31:44 UTC+2 schrieb burs...@gmail.com:
> You cannot use the strictfp keyword in front
> of Math.pow(). Thats only for the basic operations.
>
> Math.pow() itself is implemented in JDK 1.8 as follows:
>
>     public static double pow(double a, double b) {
>         return StrictMath.pow(a, b); // default impl. delegates to StrictMath
>     }
>
> Am Sonntag, 24. Juni 2018 21:21:57 UTC+2 schrieb Arne VajhÄ,j:
> > On 6/24/2018 2:41 PM, j4n bur53 wrote:
> > > Running a simple test.
> > > ** is Math.pow(),
> > > ^ is BigInteger.pow() and then BigInteger.doubleValue().
> > >
> > > On Java:
> > >
> > >  â  ?- between(15,30,N), X is 10**N-10^N, write(N-X), nl, fail; true.
> > >  â  15-0.0
> >
> > >  â  23-1.6777216E7
> >
> > >  â  29-0.0
> > >  â  30-0.0
> > >
> > > On Adroid:
> > >
> > >  â  ?- between(15,30,N), X is 10**N-10^N, write(N-X), nl, fail; true.
> > >  â  15-0.0
> >
> > >  â  23-0.0
> >
> > >  â  29-1.7592186044416E13
> > >  â  30-0.0
> > >
> > > Has Android different floats?
> > > Tested jdk1.8.0_152 against Android 8.0.0
> >
> > ARM supposedly use standard IEEE 754 FP.
> >
> > But I wonder if usage of strictfp would change your results.
> >
> > Arne

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