Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.java.programmer > #16336

Re: floating point

Show all headers | View raw

Gene Wirchenko wrote:
> Lew wrote:
>
> [snip]
>
>> So, yes, the parenthesized addition is done as an 'int' addition.
>>
>> "5.6. Numeric Promotions
>>
>> "Numeric promotion is applied to the operands of an arithmetic operator.
>> Numeric promotion contexts allow the use of:
>>
>> "    an identity conversion (§5.1.1)
>> "    a widening primitive conversion (§5.1.2)
>> "    an unboxing conversion (§5.1.8)
>>
>> "Numeric promotions are used to convert the operands of a numeric
>> operator to a common type so that an operation can be performed.
>> The two kinds of numeric promotion are unary numeric promotion
>> (§5.6.1) and binary numeric promotion (§5.6.2)."
>>
>> So, by those sections you can see that the division must be evaluated
>> as 'float'.
>>
>> For those who decry the use of the JLS to learn this, just note that the
>> relevant sections are not especially obscure and they answer the
>> question completely and authoritatively. But feel free to struggle with
>> alternatives if you really want to work harder.
>
>       This sort of thing is handled in many introductory programming
> language texts so it is not harder at all to use them instead.
>
>> <http://docs.oracle.com/javase/specs/jls/se7/html/jls-15.html>
>> <http://docs.oracle.com/javase/specs/jls/se7/html/jls-15.html#jls-15.7>
>> <http://docs.oracle.com/javase/specs/jls/se7/html/jls-5.html#jls-5.6>
>> <http://docs.oracle.com/javase/specs/jls/se7/html/jls-5.html#jls-5.6.2>
>
>       Whereas in a text, it might be "Chapter 3: Datatypes and
> Operations".  A bit simpler, no?

No.

One place to find all the answers, authoritative and final. Versus many places 
of dubious quality that might at best indirectly hint at the answer. Victory: JLS.

But you have a bug up your arse about the JLS and I recognize that from your 
continued efforts to speak against its use.

I don't demand that anyone read the JLS. I just point out that it has the 
answers, that for the most part it's readable and that the more obscure parts 
are amenable to study, and that it's worthwhile. Those who excoriate its use, 
as opposed to, say, recommending that one work with additional material as 
well, are leading the rest astray. I really don't understand this rabid 
rejection of such a useful resource.

Those of you without an irrational fear of the JLS should judge for 
yourselves. Don't be afraid of it because the Genes of the world are trying to 
frighten you away from its use. Oh, don't use it as your only source, not even 
after you've gained familiarity with it and with Java, but by all means use 
it. Gene is wrong to discourage that.

-- 
Lew
Honi soit qui mal y pense.
http://upload.wikimedia.org/wikipedia/commons/c/cf/Friz.jpg

Back to comp.lang.java.programmer | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

floating point bob smith <bob@coolfone.comze.com> - 2012-07-24 12:57 -0700
  Re: floating point markspace <-@.> - 2012-07-24 13:01 -0700
    Re: floating point Lew <lewbloch@gmail.com> - 2012-07-24 13:21 -0700
      Re: floating point Gene Wirchenko <genew@ocis.net> - 2012-07-24 13:50 -0700
        Re: floating point Lew <noone@lewscanon.com> - 2012-07-25 06:33 -0700
          Re: floating point Gene Wirchenko <genew@ocis.net> - 2012-07-25 10:44 -0700
            Re: floating point Lew <lewbloch@gmail.com> - 2012-07-25 17:09 -0700
              Re: floating point Gene Wirchenko <genew@ocis.net> - 2012-07-25 17:42 -0700
                Re: floating point Jan Burse <janburse@fastmail.fm> - 2012-07-26 03:15 +0200
          Re: floating point Arne Vajhøj <arne@vajhoej.dk> - 2012-07-25 21:05 -0400
    Re: floating point Martin Gregorie <martin@address-in-sig.invalid> - 2012-07-24 20:34 +0000
  Re: floating point Patricia Shanahan <pats@acm.org> - 2012-07-24 13:29 -0700
    Re: floating point Jukka Lahtinen <jtfjdehf@hotmail.com.invalid> - 2012-07-25 12:22 +0300
      Re: floating point Arne Vajhøj <arne@vajhoej.dk> - 2012-07-25 10:54 -0400
      Re: floating point Roedy Green <see_website@mindprod.com.invalid> - 2012-07-25 13:29 -0700

csiph-web