Groups > comp.lang.java.programmer > #31449

Re: Simple if-exercises

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From	Martin Gregorie <martin@address-in-sig.invalid>
Newsgroups	comp.lang.java.programmer
Subject	Re: Simple if-exercises
Date	Fri, 3 Apr 2015 19:31:15 +0000 (UTC)
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On Fri, 03 Apr 2015 18:05:24 +0000, Volker Borchert wrote:

> Martin Gregorie wrote:
>> On Fri, 03 Apr 2015 06:29:59 +0000, Volker Borchert wrote:
>> 
>> > Jeff Higgins wrote:
>> > 
>> >> Why don't we have a Quinary operator?
>> >> x ? y LT : EQ : GT
>> > 
>> > One of those occasions where "newer" is not "better".
>> > 
>> > I _do_ miss FORTRAN's three-way IF statement.
>> 
>> It would be more in the style of Java to extend the switch statement's
>> syntax by adding pseudo constants corresponding to <, == and > so you
>> could write something like:
>> 
>> switch(arithmetic expression)
>        sgn(                 )
>
I think you meant Math.signum() - sgn isn't Java, its a VBA/Excel/Access
function.

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";
}

-- 
martin@   | Martin Gregorie
gregorie. | Essex, UK
org       |

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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