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Re: floating point

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On Tue, 24 Jul 2012 13:21:33 -0700 (PDT), Lew <lewbloch@gmail.com>
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?

Sincerely,

Gene Wirchenko

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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

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