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boolean statement

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  boolean statement K <kalezwe@gmail.com> - 2012-10-14 17:44 -0700
    Re: boolean statement glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2012-10-15 00:57 +0000
      Re: boolean statement K <kalezwe@gmail.com> - 2012-10-14 18:25 -0700
        Re: boolean statement Lew <lewbloch@gmail.com> - 2012-10-14 21:34 -0700
        Re: boolean statement Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2012-10-15 06:54 +0000
    Re: boolean statement Eric Sosman <esosman@comcast-dot-net.invalid> - 2012-10-14 21:04 -0400
      Re: boolean statement Gene Wirchenko <genew@ocis.net> - 2012-10-14 18:52 -0700
        Re: boolean statement K <kalezwe@gmail.com> - 2012-10-14 19:55 -0700
          Re: boolean statement Gene Wirchenko <genew@ocis.net> - 2012-10-14 20:10 -0700
          Re: boolean statement Jeff Higgins <jeff@invalid.invalid> - 2012-10-15 08:20 -0400
            Re: boolean statement Lew <lewbloch@gmail.com> - 2012-10-15 09:15 -0700
    Re: boolean statement Roedy Green <see_website@mindprod.com.invalid> - 2012-10-14 22:41 -0700
      Re: boolean statement Lew <lewbloch@gmail.com> - 2012-10-15 09:15 -0700
    Re: boolean statement Robert Klemme <shortcutter@googlemail.com> - 2012-10-16 01:10 -0700

#19336 — boolean statement

Why does my boolean statement have an error message next to it in eclipse?

public class boolean1 {

	public static void main(String[] args) {
		int gumballs;
		int kids;
		int gumballsPerKid;
		boolean eachKidGetsTen;
		
		gumballs = 140;
		kids = 15;
		gumballsPerKid = gumballs / kids;
		
		System.out.print("True of False? ");
		System.out.println("Each kid gets 10 gumballs");
		eachKidGetsTen = gumballsPerKid >= 10;
		System.out.println("eachKidGetsTen");

	}

}

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#19338

K <kalezwe@gmail.com> wrote:
> Why does my boolean statement have an error message next to it in eclipse?

It should be a warning, not an error, but you never use the value
of the variable. Eclipse nicely tells you that you might have 
forgotten something.

-- glen

> public class boolean1 {

>        public static void main(String[] args) {
>                int gumballs;
>                int kids;
>                int gumballsPerKid;
>                boolean eachKidGetsTen;
>                
>                gumballs = 140;
>                kids = 15;
>                gumballsPerKid = gumballs / kids;
>                
>                System.out.print("True of False? ");
>                System.out.println("Each kid gets 10 gumballs");
>                eachKidGetsTen = gumballsPerKid >= 10;
>                System.out.println("eachKidGetsTen");

>        }

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#19340

On Sunday, October 14, 2012 5:57:12 PM UTC-7, glen herrmannsfeldt wrote:
> K <kalezwe@gmail.com> wrote:
> 
> > Why does my boolean statement have an error message next to it in eclipse?
> 
> 
> 
> It should be a warning, not an error, but you never use the value
> 
> of the variable. Eclipse nicely tells you that you might have 
> 
> forgotten something.
> 
> 
> 
> -- glen
> 
> 
> 
> > public class boolean1 {
> 
> 
> 
> >        public static void main(String[] args) {
> 
> >                int gumballs;
> 
> >                int kids;
> 
> >                int gumballsPerKid;
> 
> >                boolean eachKidGetsTen;
> 
> >                
> 
> >                gumballs = 140;
> 
> >                kids = 15;
> 
> >                gumballsPerKid = gumballs / kids;
> 
> >                
> 
> >                System.out.print("True of False? ");
> 
> >                System.out.println("Each kid gets 10 gumballs");
> 
> >                eachKidGetsTen = gumballsPerKid >= 10;
> 
> >                System.out.println("eachKidGetsTen");
> 
> 
> 
> >        }

what do you mean? How do you use the value of the variable? how would I fix my code?

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#19347

K wrote:
> what do you mean? How do you use the value of the variable? 
> how would I fix my code?

http://docs.oracle.com/javase/tutorial/

-- 
Lew

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#19352

K <kalezwe@gmail.com> wrote:
> On Sunday, October 14, 2012 5:57:12 PM UTC-7, glen herrmannsfeldt wrote:
>> K <kalezwe@gmail.com> wrote:
>> > Why does my boolean statement have an error message next to it in eclipse?
>> It should be a warning, not an error, but you never use the value
>> of the variable. Eclipse nicely tells you that you might have 
>> forgotten something.
> what do you mean? How do you use the value of the variable?
> how would I fix my code?

Since it's only a warning, you can just run the code and see the
output. My guess is, you'll instantly spot the bug, and smile as
the warning will disappear as a consequence of fixing the bug.

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#19339

On 10/14/2012 8:44 PM, K wrote:
> Why does my boolean statement have an error message next to it in eclipse?

     Probably because the variable `eachKidGetsTen' is not used.
It is given a value, but that value is never therafter consulted.

     (For future reference: When you have a question about an
"error message," it is a good idea to quote the exact text of
the message.  In this instance I imagine there was no text at
all, but still: Some description of the "error message" would
have been a good idea.  As it is, I'm just guessing -- And, as
SH taught us, "It is a capital mistake to theorize before you
have all the evidence."  But since I theorize ante-factually
only because you force me to, the offense is not mine but yours.
Off with your head!)

> public class boolean1 {
>
> 	public static void main(String[] args) {
> 		int gumballs;
> 		int kids;
> 		int gumballsPerKid;
> 		boolean eachKidGetsTen;
> 		
> 		gumballs = 140;
> 		kids = 15;
> 		gumballsPerKid = gumballs / kids;
> 		
> 		System.out.print("True of False? ");
> 		System.out.println("Each kid gets 10 gumballs");
> 		eachKidGetsTen = gumballsPerKid >= 10;
> 		System.out.println("eachKidGetsTen");

     If you removed the " marks, I bet it would pacify Eclipse.

>
> 	}
>
> }
>


-- 
Eric Sosman
esosman@comcast-dot-net.invalid

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#19343

On Sun, 14 Oct 2012 21:04:55 -0400, Eric Sosman
<esosman@comcast-dot-net.invalid> wrote:

>On 10/14/2012 8:44 PM, K wrote:
>> Why does my boolean statement have an error message next to it in eclipse?
>
>     Probably because the variable `eachKidGetsTen' is not used.
>It is given a value, but that value is never therafter consulted.

     (Your print statement does not refer to it.)

>     (For future reference: When you have a question about an
>"error message," it is a good idea to quote the exact text of
>the message.  In this instance I imagine there was no text at
>all, but still: Some description of the "error message" would
>have been a good idea.  As it is, I'm just guessing -- And, as
>SH taught us, "It is a capital mistake to theorize before you
>have all the evidence."  But since I theorize ante-factually
>only because you force me to, the offense is not mine but yours.
>Off with your head!)

     What he said.

>> public class boolean1 {
>>
>> 	public static void main(String[] args) {
>> 		int gumballs;
>> 		int kids;
>> 		int gumballsPerKid;
>> 		boolean eachKidGetsTen;
>> 		
>> 		gumballs = 140;
>> 		kids = 15;
>> 		gumballsPerKid = gumballs / kids;
>> 		
>> 		System.out.print("True of False? ");
>> 		System.out.println("Each kid gets 10 gumballs");
>> 		eachKidGetsTen = gumballsPerKid >= 10;
>> 		System.out.println("eachKidGetsTen");
>
>     If you removed the " marks, I bet it would pacify Eclipse.

     Specifically,
          eachKidGetsTen
and
          "eachKidGetsTen"
are two very different things that just happen to resemble each other
textually.

>> 	}
>>
>> }

Sincerely,

Gene Wirchenko

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#19344

Thanks now my program works

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#19345

On Sun, 14 Oct 2012 19:55:23 -0700 (PDT), K <kalezwe@gmail.com> wrote:

>Thanks now my program works

     You are welcome.

Sincerely,

Gene Wirchenko

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#19354

On 10/14/2012 10:55 PM, K wrote:
> Thanks now my program works, you may proceed.

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#19362

Jeff Higgins wrote:
>K wrote:
>> Thanks now my program works, you may proceed.

Yeah, right?

-- 
Lew

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#19349

On Sun, 14 Oct 2012 17:44:31 -0700 (PDT), K <kalezwe@gmail.com> wrote,
quoted or indirectly quoted someone who said :

>public class boolean1 {
>
>	public static void main(String[] args) {
>		int gumballs;
>		int kids;
>		int gumballsPerKid;
>		boolean eachKidGetsTen;

Classes should start with a capital letter.  See
http://mindprod.com/jgloss/codingconventions.html

eachKidGetsTen needs to be initialised.
-- 
Roedy Green Canadian Mind Products http://mindprod.com
The iPhone 5 is a low end Rolex. 

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#19361

Roedy Green wrote:
> K wrote, quoted or indirectly quoted someone who said :
>> public class boolean1 {
>>
>>	public static void main(String[] args) {
>>		int gumballs;
>>		int kids;
>>		int gumballsPerKid;
>>		boolean eachKidGetsTen;
> 
> Classes should start with a capital letter.  See
> http://mindprod.com/jgloss/codingconventions.html

The normative document is the one on the Oracle site.

> eachKidGetsTen needs to be initialised.

Two things wrong with that advice. First, as written the program does not 
require that the variable be initialized. Second, it is initialized in the 
program the OP posted:

>>  eachKidGetsTen = gumballsPerKid >= 10; 

In the strict sense, it is not initialized but assigned here, but I take the 
liberty of assuming you didn't mean it in the strict sense.

-- 
Lew

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#19392

On Monday, October 15, 2012 2:44:31 AM UTC+2, K wrote:
> Why does my boolean statement have an error message next to it in eclipse?

Just a general advice: it usually helps _a lot_ if you include the error you are seeing in your posting.  You can even copy and paste it from Eclipse.

http://www.catb.org/~esr/faqs/smart-questions.html

Cheers

robert

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