i need your help in this one...im doing a palindrome program...
"application that reads in a five-digit integers and determines whether
or not it is a palindrome. if the number is not a five-digits long. displays
an error message dialog indicating the problem to the user.when
dismisses the error dialog, allow the user to enter new value. Using
GUI cotrols..."
thats it...thanks
You cna do the swing part on your own. I don't know any of that stuff.
import java.util.Scanner;
public class Caller
{
private static final int PALINDROME_LENGTH = 5;
public static void main(String args[])
{
Scanner in = new Scanner( System.in );
String userInput = "";
do
{
System.out.print( "Enter your palindrome of length "
+ PALINDROME_LENGTH + ": " );
userInput = in.nextLine();
if ( userInput.length() == PALINDROME_LENGTH )
{
if ( isPalindrome( userInput ) )
{
System.out.println( "Your number " + userInput
+ " is a palindrome" );
}
else
{
System.out.println( "Your number " + userInput
+ " is NOT a palindrome" );
}
}
else
{
System.out.println( "Invalid length" );
}
}
while ( !userInput.equalsIgnoreCase( "exit" ) );
}
private static boolean isPalindrome(String s)
{
int halfLength = (PALINDROME_LENGTH - 1) / 2;
char[] chars = s.toCharArray();
for ( int i = 0; i < halfLength; i++ )
{
if ( !(chars[i] == chars[PALINDROME_LENGTH - 1 - i]) )
{
return false;
}
}
return true;
}
}
I must also add that the previous code only works for odd length plaindromes.
Use this method and it'll work for even and odd ones. Sorry I forgot about that...silly me.
private static boolean isPalindrome(String s)
{
int halfLength = 0;
if ( PALINDROME_LENGTH % 2 == 1 )
{
halfLength = (PALINDROME_LENGTH - 1) / 2;
}
else
{
halfLength = PALINDROME_LENGTH / 2;
}
char[] chars = s.toCharArray();
for ( int i = 0; i < halfLength; i++ )
{
if ( !(chars[i] == chars[PALINDROME_LENGTH - 1 - i]) )
{
return false;
}
}
return true;
}
> > > You cna do the swing part on your own. I don't
> > know
> > > any of that stuff.
> >
> > Do you think you are helping?
>
> No, he's a big-time grudge holder and thinks he's
> ticking me off.
Now, *this* is amusing. :o)
> I must also add that the previous code only works for
> odd length plaindromes.
>
> Use this method and it'll work for even and odd ones.
> Sorry I forgot about that...silly me.
Why not change it to..
public static boolean isPalindrome(String text) {
return text.equals(new StringBuilder(text).reverse().toString());
}
Kaj
> >
> > Do you think you are helping?
>
> I sure do. Hey, I don't know swing at all. She
> still has to do that part.
How much do you think the OP is learning if he doesn't give it a try on his own? The only thing that he will learn if you write the code for him is copy & paste.
Kaj
> > I must also add that the previous code only works
> for
> > odd length plaindromes.
> >
> > Use this method and it'll work for even and odd
> ones.
> > Sorry I forgot about that...silly me.
>
> Why not change it to..
> > public static boolean isPalindrome(String text) {
> return text.equals(new
> ew StringBuilder(text).reverse().toString());
> }
>
>
> Kaj
There's more than one way to skin a cat.
> > >
> > > Do you think you are helping?
> >
> > I sure do. Hey, I don't know swing at all. She
> > still has to do that part.
>
> How much do you think the OP is learning if he
> doesn't give it a try on his own? The only thing that
> he will learn if you write the code for him is copy &
> paste.
>
> Kaj
I don't care what they learn. That's up to them. I'm not the learning police.
> > >
> > > Do you think you are helping?
> >
> > I sure do. Hey, I don't know swing at all. She
> > still has to do that part.
>
> How much do you think the OP is learning if he
> doesn't give it a try on his own? The only thing that
> he will learn if you write the code for him is copy &
> paste.
>
> Kaj
Kaj,
There is some backstory you are missing here. I suggest reading the following thread
http://forum.java.sun.com/thread.jspa?threadID=769644
> > > >
> > > > Do you think you are helping?
> > >
> > > I sure do. Hey, I don't know swing at all. She
> > > still has to do that part.
> >
> > How much do you think the OP is learning if he
> > doesn't give it a try on his own? The only thing
> that
> > he will learn if you write the code for him is copy
> &
> > paste.
> >
> > Kaj
>
> I don't care what they learn. That's up to them.
> I'm not the learning police.
This is true. You have planted yourself firmly with the Ulrika gestapo.
> Why not change it to..
> > public static boolean isPalindrome(String text) {
> return text.equals(new
> ew StringBuilder(text).reverse().toString());
> }
>
>
> Kaj
My way is also 3-4 times faster ;-)
> > There is some backstory you are missing here. I
> > suggest reading the following thread
> >
> >
> http://forum.java.sun.com/thread.jspa?threadID=769644
>
> Thanks. But why is he posting crappy code if he wants
> to help?
I think because
a) he doesn't know any better
b) he doesn't care because the OP failing is his goal in the end
So help is sort of a subjective term in this instance.
> Thanks. But why is he posting crappy code if he wants
> to help?
Did I mention that he's just holding a grudge and wants to try all he can to tick me off?
He's not interested in helping people. He's relegated himself to the position of homework slave to see if he can tick me off. It's fun to watch, kind of.
> Thanks. But why is he posting crappy code if he wants to help?
It's not crappy, it's geeky I'd say. It is more efficient, but it looks like it's from someone with a background in C++. :)
I don't like homework being solved that way here - it helps neither us nor them (in fact, it'll keep traffic high, since there's more than one assignment) - but the code itself is good. Could be much worse.
NO, it's not just to tick you off. I was doing it before you went crazy. Maybe it's to take away a little bit of the power trip some of you guys have when total noobs post.
I agree what I'm doing is probably not going ot be helpful to anyone, but it's better than reading the same drivel from the same people over and over again.
> > Thanks. But why is he posting crappy code if he
> wants to help?
>
> It's not crappy, it's geeky I'd say. It is more
> efficient, but it looks like it's from someone with a
> background in C++. :)
>
> I don't like homework being solved that way here - it
> helps neither us nor them (in fact, it'll keep
> traffic high, since there's more than one assignment)
> - but the code itself is good. Could be much worse.
Well thank you for at least being honest :-D
> Maybe it's to take away a
> little bit of the power trip some of you guys have
> when total noobs post.
LOL
> I agree what I'm doing is probably not going ot be
> helpful to anyone, but it's better than reading the
> same drivel from the same people over and over again.
better in what sense?
If someone wants readymade solutions, they should be rightly directed to http://www.geekinterview.com/
>if ( PALINDROME_LENGTH % 2 == 1 )
>{
> halfLength = (PALINDROME_LENGTH - 1) / 2;
> }
> else
> {
> halfLength = PALINDROME_LENGTH / 2;
I don't see how that is any different from this:halfLength= PALINDROME_LENGTH/2;
I find the first version so verbose and confusing. btw, as Kaj already
had shown: there are better, more concise ways to figure out if
something is a palindrome or not. Please don't post home brew
solutions, especially not when they are wobbly and also especially not
when the OP can't learn anything from it. You are not doing the new
folks around a favour.
kind regards,
Jos
> >if ( PALINDROME_LENGTH % 2 == 1 )
> >{
> > halfLength = (PALINDROME_LENGTH - 1) / 2;
> > }
> > else
> > {
> > halfLength = PALINDROME_LENGTH /
> 2;
> I don't see how that is any different from
> this:> halfLength= PALINDROME_LENGTH/2;
>
> I find the first version so verbose and confusing.
> btw, as Kaj already
> had shown: there are better, more concise ways to
> figure out if
> something is a palindrome or not. Please don't post
> home brew
> solutions, especially not when they are wobbly and
> also especially not
> when the OP can't learn anything from it. You are not
> doing the new
> folks around a favour.
>
> kind regards,
>
> Jos
Yup x/2 works a lot better. I like all the code analysis, pick it appart all you like, fine with me. I wrote it fast and am bound to make some mistakes. Yu realize by correxting my code you're actually helping the OP any more.
It seems a bit ironic to me. You don't want to do any homework, so I do it, you hate it so I keep doing it, you hate that I do it and thus correct my code trying to make me feel stupid in the hopes that I'll go away, however, in the end you're acutally just helping the OP get better code.
Good work guys.
> > Thanks. But why is he posting crappy code if he
> wants to help?
>
> It's not crappy, it's geeky I'd say. It is more
> efficient, but it looks like it's from someone with a
> background in C++. :)
Hush. I'm trying to poke him with a stick. I want to see him upset :)
> I agree what I'm doing is probably not going ot be
> helpful to anyone, but it's better than reading the
> same drivel from the same people over and over again.
Oh, yes, totally. I can't believe the drivel that people post. **** like, "Try to do it yourself, then post what you've got and ask specific questions about the suff that's giving you trouble." What a bunch of malarkey! How dare we keep repeating that same old nonsense to these poor beleagured posters!
> > I agree what I'm doing is probably not going ot be
> > helpful to anyone, but it's better than reading
> the
> > same drivel from the same people over and over
> again.
>
> Oh, yes, totally. I can't believe the drivel that
> people post. **** like, "Try to do it yourself,
> then post what you've got and ask specific questions
> about the suff that's giving you trouble." What a
> bunch of malarkey! How dare we keep repeating that
> same old nonsense to these poor beleagured posters!
Good morning Jeff. :)
> > It seems a bit ironic to me. You don't want to do
> > any homework, so I do it, you hate it so I keep
> doing
> > it, you hate that I do it and thus correct my code
>
> The difference is that the code which I posted
> probably won't be accepted by his professor.
I don't see why it wouldn't be?
> > The difference is that the code which I posted
> > probably won't be accepted by his professor.
>
> I don't see why it wouldn't be?
1) The professor will probably notice that it isn't written by a beginner.
2) The professor probably wants the OP to use a loop, so he will tell him to do it using a loop instead.
Kaj
> It seems a bit ironic to me. You don't want to do
> any homework, so I do it, you hate it so I keep doing
> it, you hate that I do it and thus correct my code
> trying to make me feel stupid in the hopes that I'll
> go away, however, in the end you're acutally just
> helping the OP get better code.
Your mind works in a very funny way.
Jos
> It seems a bit ironic to me. You don't want to do
> any homework, so I do it, you hate it so I keep doing
> it, you hate that I do it and thus correct my code
> trying to make me feel stupid in the hopes that I'll
> go away, however, in the end you're acutally just
> helping the OP get better code.
It would be even ironic when the OP copies the first posted code and gets satisfied and ignores all the refinements. :)
