Help with recursive function to print number patterns

I'm sorry for having to ask for homework help - I'm badly stuck on this! Can someone give me a kick in the right direction with this?
need a recursive function with a single positive int parameter n. the function should write (2^n - 1) integers and should be in the following pattern...
n = 1, Output: 1
n = 2, Output: 1 2 1
n = 3, Output: 1 2 1 3 1 2 1
n = 4, Output: 1 2 1 3 1 2 1 4 1 2 1 3 1 2 1
n = 5, Output: 1 2 1 3 1 2 1 4 1 2 1 3 1 2 1 5 1 2 1 3 1 2 1 4 1 2 1 3 1 2 1
function should valid for all positive integer values of n
This was tagged as a 'short' problem...so it shouldnt take too much code...I am hung on on the following:
*Do I keep track of the numbers printed, if so how? I only have a single parameter to call with so I am confused as to how I could get an entire pattern without keeping track of the history
*I had initially thought it would be necessary to cut it in half and do the 2nd half backwards (ie: for n=3, I would take care of the 1 2 1 - then 3 - then 1 2 1...but even then it seems like I could cut 1 2 1 in half the same way and therefor I should be able to do ALL of it in single parts...
Can someone veer me in the right direction here? I'm really lost with this.

This was tagged as a 'short' problem...so it shouldnt
take too much code...Yeah, the method body could be done in a few lines.
I am hung on on the following:
*Do I keep track of the numbers printed, if so how?Not explicitly. Use the call stack. That is, use the fact that when you're recursing, the previous values of numbers are preserved in the previous method invocation.
I only have a single parameter to call with so I am
confused as to how I could get an entire pattern
without keeping track of the historyYou don't have to store anything across method invocations.
I had initially thought it would be necessary to cut
it in half and do the 2nd half backwards (ie: for
n=3, I would take care of the 1 2 1 - then 3 - then 1
2 1...but even then it seems like I could cut 1 2 1
in half the same way and therefor I should be able to
do ALL of it in single parts...No, it's MUCH simpler than that. It's easier than yo uthink.
Can someone veer me in the right direction here? I'm
really lost with this.Try this simpler version of the problem:
Write a recursive method that creates this output:
n = 1: 1
n = 2: 1 2
n = 3: 1 2 3
And try this simpler version:
n = 1: 1
n = 2: 2 1
n = 3: 3 2 1

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hi ,everyone
i am writing a program to print out the ncr of an array
ie gievn [1,2,3]
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2 1 3
2 3 1
3 1 2
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however my program output is
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can somebody help me out to make my program to output the expected outcome
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I would say to treat each character more like a symbol because that's how we handle such problems. Then write a method that tracks the position of each symbol / object and bumps it to antoher position and it'll do this for each object.
such as:
123
where 1 is obj a, 2 is obj b, and 3 is obj c.
Then pick on obj b and bump it to obj c's position and print the result, then bump it to obj a's position.
123 ---> 132 DONE focusing on obj a.
213 ---> 231 DOND focusing on obj b.
312 ---> 321 DOND focusing on obj c.
The number of bumps for each object will be determined by the original objects size, so a 3 digit number would have two bumps for each object and a 4 digit number (1234) would have 3 bumps per obj, etc....
A key part to this letting each obj stand in as a "leader" and having two bumps after it's assignment. Otherwise you'll recieve duplicate values.
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Hi...I was wondering if I could get help with this function. How do i write a function to return hours between a begin date and an end date for an employee. Thanks so much

EdStevens wrote:
AlexeyDev wrote:
sb92075 wrote:
select (date2-date1)*24 from dual;not as above but as below
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Exception in thread "AWT-EventQueue-0" java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
     at java.util.ArrayList.RangeCheck(Unknown Source)
     at java.util.ArrayList.get(Unknown Source)
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     at com.edzillion.crossword.GameCube.computeBoards(GameCube.java:763)
     at com.edzillion.crossword.GameCube.computeBoards(GameCube.java:763)
     at com.edzillion.crossword.GameCube.computeBoards(GameCube.java:763)
     at com.edzillion.crossword.GameCube.computeBoards(GameCube.java:763)
     at com.edzillion.crossword.GameCube.computeBoards(GameCube.java:763)
     at com.edzillion.crossword.GameCube.computeBoards(GameCube.java:763)
     at com.edzillion.crossword.GameCube.computeBoards(GameCube.java:763)
     at com.edzillion.crossword.GameCube.computeBoards(GameCube.java:763)
     at com.edzillion.crossword.GameCube.computeBoards(GameCube.java:763)
     at com.edzillion.crossword.GameCube.computeBoards(GameCube.java:763)
     at com.edzillion.crossword.GameCube.computeBoards(GameCube.java:763)
     at com.edzillion.crossword.GameCube.computeBoards(GameCube.java:763)
     at com.edzillion.crossword.GameCube.computeBoards(GameCube.java:763)
     at com.edzillion.crossword.GameCube.computeBoards(GameCube.java:763)
     at com.edzillion.crossword.GameCube.computeBoards(GameCube.java:763)
     at com.edzillion.crossword.GameCube.computeBoards(GameCube.java:763)
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Any ideas? I've looked up this exception which didn't shed any light...

ArrayList<Word> words = new ArrayList<Word>();See the API Javadoc for ArrayList: this creates an empty ArrayList.
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If you want to stick to that logic (I am too lazy to proof-read your whole algorithm, but that should at least unblock you), you should first check whether the list actually contains at least one element:
if (!words.isEmpty()) {...}

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... How can I achieve this using Analytic Function(s)?The best solution may not involve analytic functions at all. Is that okay?
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Edited by: Frank Kulash on Aug 29, 2011 3:05 PM

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In this case, it looks like there's an "odd" character and probably an å character on that line and apparently the Svenska ariadnetrådens.
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Given it appears to be Svenska, it might work better to switch to Svenska collation thanto the suggested C collation.
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Click the “Kudos Thumbs Up" to the left of the reply button to say “Thanks” for helping!

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{order_header.date_entered} >= {?Start Date} and
{order_header.date_entered} <= {?End Date} and
(not HasValue({?Account Number}) or {order_header.account_no} = {?Account Number})and
(not HasValue({?Product Group}) or {order_lines.stock_code}[1 to 5] = {?Product Group})and
(not HasValue({?Sales Area}) or {slslsp.slr_slsperson} in {?Sales Area});
All the Hasvalue are not being passed on through SQL, as you can see below I have chosen a customer account number but it does not reflect in the query, however the results are according to customer account.
SELECT DISTINCT order_header.order_no, order_header.order_status, order_header.date_entered,
ndmas.ndm_name, order_header.account_no, order_progress.order_status, order_lines.stock_code,
slslsp.slr_slsperson, slslsp.slr_slspname, order_progress.date_created
FROM maxmast.ndmas ndmas, maxmast.order_header order_header, maxmast.order_lines order_lines,
maxmast.order_progress order_progress, maxmast.slcust slcust, maxmast.slslsp slslsp
WHERE (order_header.order_no=order_lines.order_no) AND
((order_header.order_no=order_progress.order_no) AND (order_header.repeat_no=order_progress.repeat_no))
AND (order_header.account_no=slcust.slm_custcode) AND (ndmas.ndm_ndcode=slcust.slm_custcode) AND
(slcust.slm_slsperson=slslsp.slr_slsperson) AND (order_header.date_entered>={ts '2008-10-01 00:00:00'}
AND order_header.date_entered<={ts '2008-10-05 00:00:00'})
Regards
Jehanzeb

NEED HELP with HP P1006 DUPLEX printing

This printer has the ability to print duplex pages (manual).
This is different from printing the odd pages and then the even pages to achieve two-sided pages.
This affects me because I like to print 2-sided AND print 2 pages on each side and the manual odd/even trick messes up the page order because I will end up with the first and third pages on one side of the paper and the second and fourth pages on the other side. Essentially I was able to print 4 pages onto 1 sheet of paper.
Please help me save paper!! I am a grad student and I do a lot of printing!!!
Other information:
1. I have the latest driver updates.
2. I can see the option for two-sided printing but it is grayed out and set on "off"
3. I know for a fact that my printer has this property-- it is marketed as having manual duplex printing (plus it worked fine with windows vista on my pc with the CD software)
4. What I've learned so far is that the latest driver is not "clever" enough to enable the duplex printing and there are no plans to make it better WHICH I HOPE IT NOT TRUE!!!
Please help genius or Apple gods.
Thank you!

rosh325,
The HP Photosmart C4280 does support manual duplex printing (as do all of the devices). The request on this thread is specific to a special form of manual duplex printing that these devices used to support (but on the Mac your device does not). To get the Manual duplexing, you can Print Odd pages, take the paper out, place it back in your input tray, and then print even pages. Just take the whole stack from the output tray and place it so you can see the printing and its right side up when you put it in your input tray. (You may want to experiment with a small document just to make sure you have the workflow down).
As for button support, install the full solution for your device from [here|http://h10025.www1.hp.com/ewfrf/wc/softwareDownloadIndex?softwareitem=oj- 74785-1&lc=en&dlc=en&cc=us&lang=en&os=219&product=3192753] and it should restore the button functionality.
Just trying to help.
Andrew

Help with main function

Can someone help me out with this? Im trying to create a main function out of this contructor.
public studentID()
int size; //hold returned values from box
int id;
int age;
size = Integer.parseInt(JOptionPane.showInputDialog (" Enter a nummber between 1 & 40")); //dialog box
recCount = 0;
idArray = new int[size];
ageArray = new int[size];
for(int i = 0; i <size; i++) //ask for values (size) times
id =
Integer.parseInt(JOptionPane.showInputDialog ("Enter an ID Number"));
age =
Integer.parseInt(JOptionPane.showInputDialog ("Enter an age"));
inputStudent(age, id); //calles method to put values in array
displayAll();
selectionSort(idArray, ageArray, size);
newNumberTable();
selectionSort(ageArray, idArray, size);
newAgeTable();
}

So what's the problem? Dump it all into the main method.
Actually I'd advise thinking carefully about whether it should really be in main(). Generally, IMHO, main should only bootstap an app. The real functionality should be in other methods that main() calls.

Help with recursive function to print number patterns

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