UpCount - recursive calamity

V4hn · Post by **V4hn** » Sun Oct 05, 2008 10:16 pm

Ev'ning,

no problems solving it, but since my JavaVM stopped because of a stack overflow, when I tried to run the code, I had to port it to C...
I'm wondering, whether there is any option to increase the default stack-size in java?

lechat · Post by **lechat** » Mon Oct 06, 2008 6:25 pm

what about 'java -X'? Then you can use 'java -Xss1024M' for 1Gb stack size...
But do you really need it?

V4hn · Post by **V4hn** » Mon Oct 06, 2008 7:07 pm

lechat wrote:what about 'java -X'? Then you can use 'java -Xss1024M' for 1Gb stack size...

Ah, thanks!
I don't work with Java normally, since I don't like bytecode,
so I didn't know any parameters..

But do you really need it?

Well, not any more, since I've done that challenge,
but we're hacking to learn, aren't we?
And next time I need to run some heavy recursive java code,
I'll know how to increase the stacksize

Donster · Post by **Donster** » Tue Nov 04, 2008 10:25 am

I get the same problems with the Stackoverflow.
Then I turned the recursive function into an iterative one.
It works fine.

knox · Post by **knox** » Tue Nov 04, 2008 11:54 am

I think donster's post is giving to much hint on solving the challenge. Maybe the post should be censored.

Post by **adum** » Tue Nov 04, 2008 6:58 pm

this discussion is a little to give-away, but since the problem is really quite simple i'm not going to worry about it.

superhacker · Post by **superhacker** » Fri Apr 03, 2009 11:46 am

I changed the code to vb and used another method to count up

However the result i get seems to be wrong...
My result is a 5 digit number, does that sound alright?

psycore · Post by **psycore** » Wed Jul 01, 2009 6:01 pm

lechat wrote:But do you really need it?

Uhm, since I don't even know the words recursive or iterative (should I? I'm 16), yes.

SandyThiemer · Post by **SandyThiemer** » Wed Dec 23, 2009 9:42 pm

Hello,

i have a problem with the upcount challenge. I installed jdk 1.6.0_17 and compiled the class file without any problems but when i run the classfile i got an exception:

Exception in thread "main" java.lang.NoClassDefFoundError: upcount/class
Could not find the main class: upcount.class. Program will exit.

I really dont understand that because i changed nothing in the upcount.java file.

I hope the text above is not a spoiler...

thx in advance(?)

Sandy

DaymItzJack · Post by **DaymItzJack** » Wed Dec 23, 2009 10:19 pm

What are you using to run it?

SandyThiemer · Post by **SandyThiemer** » Wed Dec 23, 2009 11:52 pm

the simple commandline tool in the jdk named java

DaymItzJack · Post by **DaymItzJack** » Thu Dec 24, 2009 3:54 am

SandyThiemer wrote:the simple commandline tool in the jdk named java

How so? You might be doing something wrong.

SandyThiemer · Post by **SandyThiemer** » Thu Dec 24, 2009 10:50 am

the classfile from the upcount.jave is in the same directory like java and so i just type in

java upcount.class

then the error appears

megatron40 · Post by **megatron40** » Thu Dec 24, 2009 2:04 pm

When running a Java application from the command line you don't want to append the .class extension. Just the class name. So in your case it would be something like

Code: Select all

java upcount

SandyThiemer · Post by **SandyThiemer** » Thu Dec 24, 2009 6:43 pm

oh youre right! Thx! What a dumb failure