Trouble in comparing exponential numbers.

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ruds - 12 Jun 2007 10:48 GMT

hi,
I'm comparing double and expnential numbers.
I have a file which contains id and corresponding double or
exponential no.
I have to get highest no. and its corresponding id.
I'm using arraylists, aray for storing values.
I'm not able to compare nos. with exponential part e.g: 3.01706E-12,
etc.
what should do???

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Christian - 12 Jun 2007 11:17 GMT

ruds schrieb:

> hi,
> I'm comparing double and expnential numbers.
[quoted text clipped - 5 lines]
> etc.
> what should do???

could you be a bit more specific why

Double.compare(d1,d2); doesn't work?

like:

Comparator<IDDouble> comp = new Comparator<IDDouble>() {

    public int compare(IDDouble a, IDDouble b) {
        return Double.compare(a.no , b.no);
    }
};

IDDouble max = Collections.max(arraylist, comp);

double is a number with an exponent. where is the difference? how about
transforming them to double for the comparisson ?

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ruds - 12 Jun 2007 11:33 GMT

That wht i'm doing.
coverting string to double and them comparing
if(max1 > val1)
{
...
}

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Lew - 12 Jun 2007 15:44 GMT

> That wht i'm doing.
> coverting string [sic] to double and them comparing
> if(max1 > val1)
> {
> ...
> }

The presence of an "exponential part" should have absolutely no effect on your
conversion. How exactly are you converting the numbers from String?

Provide an SSCCE - a simple, self-contained correct (compilable) example. All
the hand-waving and paraphrasing isn't helping.

Signature

Lew

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Trouble in comparing exponential numbers.

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