Programming Forums > Application Development > Java

Wizard1988 · Sep 5th, 2007, 10:01 PM

Basically I have to write a program where the user can enter up to 30 characters and I have to check if the input is a palindrome. I did write this program and it works 100% however there is a catch... The professor wants us to store the input in char variables as in declare 30 chars and use that. What do you guys think is the least tedious way to accomplish this???

Thanks in advance.

ReggaetonKing · Sep 5th, 2007, 10:21 PM

How are you getting the input? Scanner class? Does the professor want you to capture each char the user enters and store in a char array?

Here what I've would done

(Toggle Plain Text)

//imports, class naming, etc...w/e!

public static void main(String[] args)
{
	java.util.Scanner scanner = new java.util.Scanner(System.in);
	
	char[] input = scanner.next().toCharArray();
	if(input.length > 30)
		throw new Exception("TOO BIG!!!");
	
	char[] reverseInput = new char[input.length];

	for(int x = 0, i = input.length -1; i > 0; i--, x++)
		reverseInput[x] = input[i];

	for(int x = 0; x < input.length; x++)
	{
		if(reverseInput[x] != input[x])
		{
			System.out.prinln("Not a Palindrome!");
			System.exit(0);
		}
	}
	System.out.prinln("It's a Palindrome!");
		
}

I did not compile it so there might be errors but that is along the lines of what I would do. I don't know if you're allowed to do this.

Wizard1988 · Sep 5th, 2007, 10:23 PM

Yes that would be the easy way to do it.... NO arrays are allowed. I can only use a string to get the input and then I have to store each character in a char.

Dameon · Sep 5th, 2007, 10:27 PM

Quote:

Originally Posted by Wizard1988

Yes that would be the easy way to do it.... NO arrays are allowed. I can only use a string to get the input and then I have to store each character in a char.

If that was his actual intention, I am truly disturbed.

ReggaetonKing · Sep 5th, 2007, 10:29 PM

Are you serious?!!? You actually have to DECLARE 30 char variables! Damn! Sorry dude... I don't have that much time. Honestly though, why would anyone need to do that!?

Wizard1988 · Sep 5th, 2007, 10:31 PM

I am too... I am assuming that his goal is to make us appreciate arrays ect...

King · Sep 5th, 2007, 10:45 PM

Yea that seems pretty stupid. My teacher in high school did something similar to get us to appreciate arrays, but there is better ways then wasting a night doing a retarded program like that lol. Just hand it in with 5 variables and add a comment at the end saying the rest will look similar haha.

crawforddavid2006 · Sep 5th, 2007, 10:59 PM

Quote:

Originally Posted by Wizard1988

I am assuming that his goal is to make us appreciate arrays ect...

or he doesnt know that arrays make things easy and more efficient

Wizard1988 · Sep 7th, 2007, 12:31 AM

Like a monkey I just typed out around 600 lines of code and this shit ain't working. :mad:

DaWei · Sep 7th, 2007, 12:48 AM

I've known some very good and dedicated teachers, but there's a reason for the stereotype: Those who can, do; those who can't, teach.

Sep 5th, 2007, 10:01 PM	#1
Wizard1988 Professional Programmer Join Date: Oct 2005 Location: Chitown Posts: 416 Rep Power: 3	Palindrome [Stupid rules] Basically I have to write a program where the user can enter up to 30 characters and I have to check if the input is a palindrome. I did write this program and it works 100% however there is a catch... The professor wants us to store the input in char variables as in declare 30 chars and use that. What do you guys think is the least tedious way to accomplish this??? Thanks in advance. __________________ JG-Webdesign

Sep 5th, 2007, 10:21 PM	#2
ReggaetonKing Sexy Programmer Join Date: Nov 2005 Location: New Jersey Posts: 891 Rep Power: 3	How are you getting the input? Scanner class? Does the professor want you to capture each char the user enters and store in a char array? Here what I've would done (Toggle Plain Text) //imports, class naming, etc...w/e! public static void main(String[] args) { java.util.Scanner scanner = new java.util.Scanner(System.in); char[] input = scanner.next().toCharArray(); if(input.length > 30) throw new Exception("TOO BIG!!!"); char[] reverseInput = new char[input.length]; for(int x = 0, i = input.length -1; i > 0; i--, x++) reverseInput[x] = input[i]; for(int x = 0; x < input.length; x++) { if(reverseInput[x] != input[x]) { System.out.prinln("Not a Palindrome!"); System.exit(0); } } System.out.prinln("It's a Palindrome!"); } //imports, class naming, etc...w/e! public static void main(String[] args) { java.util.Scanner scanner = new java.util.Scanner(System.in); char[] input = scanner.next().toCharArray(); if(input.length > 30) throw new Exception("TOO BIG!!!"); char[] reverseInput = new char[input.length]; for(int x = 0, i = input.length -1; i > 0; i--, x++) reverseInput[x] = input[i]; for(int x = 0; x < input.length; x++) { if(reverseInput[x] != input[x]) { System.out.prinln("Not a Palindrome!"); System.exit(0); } } System.out.prinln("It's a Palindrome!"); } I did not compile it so there might be errors but that is along the lines of what I would do. I don't know if you're allowed to do this. __________________ I would love to change the world, but they won't give me the source code!

Sep 5th, 2007, 10:23 PM	#3
Wizard1988 Professional Programmer Join Date: Oct 2005 Location: Chitown Posts: 416 Rep Power: 3	Yes that would be the easy way to do it.... NO arrays are allowed. I can only use a string to get the input and then I have to store each character in a char. __________________ JG-Webdesign

Sep 5th, 2007, 10:29 PM	#5
ReggaetonKing Sexy Programmer Join Date: Nov 2005 Location: New Jersey Posts: 891 Rep Power: 3	Are you serious?!!? You actually have to DECLARE 30 char variables! Damn! Sorry dude... I don't have that much time. Honestly though, why would anyone need to do that!? __________________ I would love to change the world, but they won't give me the source code!

Sep 5th, 2007, 10:31 PM	#6
Wizard1988 Professional Programmer Join Date: Oct 2005 Location: Chitown Posts: 416 Rep Power: 3	I am too... I am assuming that his goal is to make us appreciate arrays ect... __________________ JG-Webdesign

Sep 5th, 2007, 10:45 PM	#7
King Professional Programmer Join Date: Jan 2006 Location: Ontario, Canada Posts: 369 Rep Power: 0	Yea that seems pretty stupid. My teacher in high school did something similar to get us to appreciate arrays, but there is better ways then wasting a night doing a retarded program like that lol. Just hand it in with 5 variables and add a comment at the end saying the rest will look similar haha. __________________ I am Addicted to Linux!

Sep 7th, 2007, 12:31 AM	#9
Wizard1988 Professional Programmer Join Date: Oct 2005 Location: Chitown Posts: 416 Rep Power: 3	Like a monkey I just typed out around 600 lines of code and this shit ain't working. :mad: __________________ JG-Webdesign

Sep 7th, 2007, 12:48 AM	#10
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	I've known some very good and dedicated teachers, but there's a reason for the stereotype: Those who can, do; those who can't, teach. __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

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Programming Forums > Application Development > Java

Palindrome [Stupid rules]