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Re: Simple if-exercises

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From	Jeff Higgins <jeff@invalid.invalid>
Newsgroups	comp.lang.java.programmer
Subject	Re: Simple if-exercises
Date	Thu, 02 Apr 2015 10:53:33 -0400
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On 04/02/2015 09:58 AM, Jeff Higgins wrote:
> On 04/01/2015 08:10 PM, Stefan Ram wrote:
>>    I was looking for very simple if-exercises.
>>
>>    I usually found exercises like this:
>>
>>        »Print "positive" if x > 0, "non-positive", otherwise.«
>>
>>    The expected answer would be
>>
>> if( x > 0 )
>> System.out.println( "positive" );
>> else
>> System.out.println( "non-positive" );
>>
>>    However, I already have taught »?:«, so the better
>>    (shorter) solution would be:
>>
>> System.out.println( ( x > 0 ? "" : "non-" )+ "positive" );
>>
>>    . Do you know a very simple if-exercise whose solution
>>    cannot be written more tersely with the ternary operator
>>    or where the formulation with »if« is clearly better than
>>    with the ternary operator?
>>
>>    Knowledge that can be assumed: calls and declarations of
>>    static methods, +, -, *, /, usage of variables, declarations
>>    of local variables, boolean, int, double, String, literals,
>>    the block {...}, ?:, <, >, <=, >=, !=, ==.
>>
> Why don't we have a Quinary operator?
> x ? y LT : EQ : GT
>
Or Senary might be better - avoids an unchecked exception.
x ? y LT : EQ : GT : NC

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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