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Thread: Encoding Program

  1. #1
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    Default Encoding Program

    Hi all, i am trying to make a program with arrays that encodes a word or phrase inputted by the user. The "encoding language" is shown under the array named "encode." What i have so far compiles and runs, but when i try inputting a phrase, nothing outputs. I was wondering if anyone could help me out! Thanks!

     
    import java.util.Arrays;
    import java.util.Scanner;
    /**
     * Write a description of class decoderProgram here.
     * 
     * @author (your name) 
     * @version (a version number or a date)
     */
    public class decoderProgram
    {
        public static void main (String [] args)
        {
            System.out.println("\f");
            Scanner myScan=new Scanner (System.in);
            char[] alphabet= {' ', 'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
            char[] encode={' ', 'q','w','e','r','t','y','u','i','o','p','a','s','d','f','g','h','j','k','l','z','x','c','v','b','n','m'};
     
     
            System.out.println("Enter a phrase do be encoded");
            String userInput=myScan.nextLine();
     
            userInput=userInput.toUpperCase();
     
     
     
            String output= " ";
            char firstLetter=' ';
            for(int i = 0; i<userInput.length(); i++)
            {
     
                for (int x =0; x<27; x++)
                {
                    if (firstLetter == encode[x])
                    {
                        output= output+alphabet[x];
                    }
                }
     
            }
     
     
            System.out.println(output);
     
        }
    }


  2. #2
    Super Moderator jps's Avatar
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    Default Re: Encoding Program

    Quote Originally Posted by geabus1043 View Post
    ...nothing outputs...
    Are you sure? Does it compile?

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    Default Re: Encoding Program

    oddly enough yes, im going to try it on my other computer and see what happens, could be a bug, ill let you know.

    --- Update ---

    ok so it actually technically does output something but that something is just a blank line.... not sure if that helps or not

  4. #4
    Super Moderator jps's Avatar
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    Default Re: Encoding Program

    There seems to be an import missing
    After that it compiles but warns about not closing the scanner.
    But I do get output, just likely not the output desired.
    Fix the import and close the scanner, post the modified code and any error messages you may have with your question

    --- Update ---

    ok so it actually technically does output something but that something is just a blank line.... not sure if that helps or not
    Yes, now add some other printlns to determine what parts of the code are running and try to find where things seem to go unexpected. Are the loops running? Are characters being matched? Are characters being encoded?...
    See what you find

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    geabus1043 (May 22nd, 2013)

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    Default Re: Encoding Program

    ok so i found out that having char firstLetter=' '; was my problem, and when i changed it to firstLetter= userInput.charAt(0); i got an output, but it would just be the first letter, which made sense. So after my first for loop i put

    firstLetter=userInput.charAt(i);

    and now it works! thanks for the help!!

  7. #6
    Super Moderator jps's Avatar
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    Default Re: Encoding Program

    You are welcome, I am glad you got it working.
    Please mark your threads as solved when your questions have been answered.
    Directions can be found in the Announcements page if you need help.

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