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Thread: Intro to java assignment help

  1. #1
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    Default Intro to java assignment help

    hey guys,

    I'm new to java and was given this assignment in class:

    Write an application that determines whether a phrase entered by the user is a
    palindrome. A palindrome is a phrase that reads the same backward and forward
    without regarding capitalization or punctuation. For example, “Dot saw I was Tod”,
    “Was it a car or a cat I saw?”, and “Madam, I’m Adam” are palindromes. Save the file
    as Palindrome.java.

    so far I have this:

    // Purpose:   determines whether a phrase is a palindrome
    // Date:       9/19/2012
    // Filename:   Palindrome.java
    // Input:       a string from the user
    // Output:     "It is a palindrome" or "It isn't a palindrome"
     
     
    import java.util.Scanner;
    public class Palindrome
    {
     
    public static void main(String[] args)
    {
     
    //get input
    Scanner input = new Scanner(System.in); 
    System.out.println("Enter the word or prase: ");
    String testWord = input.nextLine();
     
     
    //create variables
    //upperWord is used to convert the entire phrase to upper so as to ignore the capitalization
    //reverseWord is the uppercase phrase in reverse
     
    StringBuilder upperWord = new StringBuilder(testWord.toUpperCase() + 16);
    StringBuilder reverseWord = new StringBuilder(upperWord.length() + 16);
     
     
    //reverse the word
    for(int x = 0; x != (testWord.length() - 1) ; ++x)
    {
    	reverseWord.setCharAt(x, testWord.charAt(testWord.length() - x - 1)); //ERROR HERE. 0 index is out of bounds.
    }
     
    //compares the two words
    int counter = 0;
    char isEqual = 'y';
    while(counter != upperWord.length() || isEqual == 'y')
    {
    	if(upperWord.charAt(counter) != reverseWord.charAt(counter))
    		isEqual = 'n';
    }
     
    //display output
    if(isEqual == 'y')
    	System.out.println(testWord + "is a palindrome!");
    else
    	System.out.println(testWord + "is not a palindrome.");
     
     
    }
    }


    I've got a problem with my for loop, which I marked above. I feel like this is a simple fix but haven't been able to figure it out yet. Any help fixing this or making it more efficient would be much appreciated. thanks.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Intro to java assignment help

    Please Edit your post and wrap your code with
    [code=java]
    <YOUR CODE HERE>
    [/code]
    to get highlighting and preserve formatting.

    index is out of bounds.
    What is the value of the index and what is the size of the String being indexed? Remember indexing starts at 0 and goes to the length-1.

    Print out the index and the String so you can see what the values the computer sees and determine the problem.
    If you don't understand my answer, don't ignore it, ask a question.

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