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Re: Simple if-exercises

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From	Eric Sosman <esosman@comcast-dot-net.invalid>
Newsgroups	comp.lang.java.programmer
Subject	Re: Simple if-exercises
Date	Fri, 03 Apr 2015 16:07:23 -0400
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On 4/3/2015 3:31 PM, Martin Gregorie wrote:
>[...]
> But in any case using Math.signum() looks kind of messy by the time
> you've called the static function and then coerced its result to integer:
>
> switch((int)Math.signum(n))
> {
>     case -1:
>     case 0:  s = "Negative-or-equal"; break;
>     case +1: s = "Positive"; break;
>     default: s = "Defaulted";
> }

     Note that the "default:" case will never execute.
Math.signum(n) can return Double.NaN (or Float.NaN, depending
on the type of "n"), but converting a NaN to int yields zero.
JLS 5.1.3.

-- 
esosman@comcast-dot-net.invalid
"Don't be afraid of work. Make work afraid of you." -- TLM

Thread

Re: Simple if-exercises Jeff Higgins <jeff@invalid.invalid> - 2015-04-02 09:58 -0400
  Re: Simple if-exercises Jeff Higgins <jeff@invalid.invalid> - 2015-04-02 10:53 -0400
    Re: Simple if-exercises Jerry Stuckle <jstucklex@attglobal.net> - 2015-04-02 15:08 -0400
  Re: Simple if-exercises Gene Wirchenko <genew@telus.net> - 2015-04-02 16:46 -0700
  Re: Simple if-exercises v_borchert@despammed.com (Volker Borchert) - 2015-04-03 06:29 +0000
    Re: Simple if-exercises Martin Gregorie <martin@address-in-sig.invalid> - 2015-04-03 10:29 +0000
      Re: Simple if-exercises v_borchert@despammed.com (Volker Borchert) - 2015-04-03 18:05 +0000
        Re: Simple if-exercises Martin Gregorie <martin@address-in-sig.invalid> - 2015-04-03 19:31 +0000
          Re: Simple if-exercises Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-04-03 16:07 -0400
            Re: Simple if-exercises Martin Gregorie <martin@address-in-sig.invalid> - 2015-04-03 21:45 +0000
          Re: Simple if-exercises v_borchert@despammed.com (Volker Borchert) - 2015-04-03 23:49 +0000
    Re: Simple if-exercises Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-04-03 07:38 -0400
      Re: Simple if-exercises Jeff Higgins <jeff@invalid.invalid> - 2015-04-03 20:06 -0400

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