Welcome to the Java Programming Forums


The professional, friendly Java community. 21,500 members and growing!


The Java Programming Forums are a community of Java programmers from all around the World. Our members have a wide range of skills and they all have one thing in common: A passion to learn and code Java. We invite beginner Java programmers right through to Java professionals to post here and share your knowledge. Become a part of the community, help others, expand your knowledge of Java and enjoy talking with like minded people. Registration is quick and best of all free. We look forward to meeting you.


>> REGISTER NOW TO START POSTING


Members have full access to the forums. Advertisements are removed for registered users.

Results 1 to 9 of 9

Thread: Code for EvenCount

  1. #1
    Junior Member
    Join Date
    Jul 2012
    Posts
    5
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Default Code for EvenCount

    Create a class called EvenCount that contains a method called count that takes an integer as an argument and returns an integer (this method should not be declared static). The count method should use a recursive approach to find the amount of even digits in the integer passed into the method, and return this number. For example, if the count method was called with the input value 783312 as an argument it should return 2 (there are two even numbers in the input value). Hint: in Java a single digit that is even will produce a result of 0 when the remainder operator (the percent sign) is used to find its remainder when divided by two. For example 2 % 2 and 6 % 2 will return 0, whereas 3 % 2 and 7 % 2 will produce a result of 1.

     package mocktest;
     
    public class EvenCount {
     
        public String count(String x) {
     
    	if (x < 10 && x % 2 == 0)
    	    return 1; 
    	else if (x < 10 && % 2 !0)
    	    return 0;
    	else if ((x >=10 && (x / 10 ) % 2 == 0)
    	    return 1 + count(x/10) + 1;
    		 else
    		     return count (x/10);
        }
        public static void main (String args[]); {
     
    	EvenCount c = new EvenCount ();
    	System.out.println(x.count(73221));
        }
    }

    Why do i have so many errors?


  2. #2
    Super Moderator Norm's Avatar
    Join Date
    May 2010
    Location
    SW Missouri
    Posts
    20,618
    Thanks
    50
    Thanked 2,235 Times in 2,207 Posts

    Default Re: Code for EvenCount

    You forgot to post the full text of the error messages. Please post them if you need help.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
    Administrator copeg's Avatar
    Join Date
    Oct 2009
    Location
    US
    Posts
    5,308
    Thanks
    181
    Thanked 824 Times in 767 Posts
    Blog Entries
    5

    Default Re: Code for EvenCount

    Mehwish-S, read the forum rules. Do NOT double post. I have moved and locked your other post.

  4. #4
    Member
    Join Date
    Jul 2012
    Posts
    90
    Thanks
    1
    Thanked 2 Times in 2 Posts

    Default Re: Code for EvenCount

    Is it ok to compare a string to a number?I do not think so

  5. #5
    Super Moderator Norm's Avatar
    Join Date
    May 2010
    Location
    SW Missouri
    Posts
    20,618
    Thanks
    50
    Thanked 2,235 Times in 2,207 Posts

    Default Re: Code for EvenCount

    By number do you mean an int or a double?
    To compare an int or double to a String, you need to convert one to the same data type as the other.

    In some cases the compiler using autoboxing will convert a primitive to an object.
    If you don't understand my answer, don't ignore it, ask a question.

  6. #6
    Member
    Join Date
    Jul 2012
    Posts
    90
    Thanks
    1
    Thanked 2 Times in 2 Posts

    Default Re: Code for EvenCount

    I agree about autoboxing but look at this

     public String count(String x) {
     
    	if (x < 10 && x % 2 == 0)
    ...

    is this acceptable?

  7. #7
    Super Moderator pbrockway2's Avatar
    Join Date
    Jan 2012
    Posts
    939
    Thanks
    6
    Thanked 202 Times in 178 Posts

    Default Re: Code for EvenCount

    The assignment instructs were pretty explicit: the required should take an int argument and return the even (base 10) digit count as an int.

    So forget String. The recursion requirement is weird enough (in Java) without being autoboxed about the ears to boot.

  8. #8
    Super Moderator pbrockway2's Avatar
    Join Date
    Jan 2012
    Posts
    939
    Thanks
    6
    Thanked 202 Times in 178 Posts

    Default Re: Code for EvenCount

    D@mn, I can' tedit posts on my phone. Instruct should be instructions and the required method must take and return an int.

    Do think about the recursion requirement before you begin to code. You are looking for a recipe that will get you part of the answer and call itself to get the rest.

  9. #9
    Member Darryl.Burke's Avatar
    Join Date
    Mar 2010
    Location
    Madgaon, Goa, India
    Posts
    491
    Thanks
    8
    Thanked 47 Times in 45 Posts

    Default Re: Code for EvenCount

    This thread has been cross posted here:

    http://www.java-forums.org/new-java/62402-code-evencount.html

    Although cross posting is allowed, for everyone's benefit, please read:

    Java Programming Forums Cross Posting Rules

    The Problems With Cross Posting


Similar Threads

  1. How to Translate working code into code with a Tester Class
    By bankoscarpa in forum What's Wrong With My Code?
    Replies: 6
    Last Post: October 15th, 2012, 02:13 PM
  2. code to refresh and check the code of a webpage..
    By vaggelis in forum What's Wrong With My Code?
    Replies: 1
    Last Post: February 7th, 2012, 06:43 AM
  3. problem in my code java code graph editeur
    By kisokiso in forum Java Theory & Questions
    Replies: 5
    Last Post: January 6th, 2012, 07:36 AM
  4. Code is giving an error in console, but there are no errors apparent in the code!
    By JamEngulfer221 in forum What's Wrong With My Code?
    Replies: 2
    Last Post: November 15th, 2011, 08:30 PM
  5. describe this program code by code ....
    By izzahmed in forum What's Wrong With My Code?
    Replies: 2
    Last Post: October 29th, 2011, 11:03 PM