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Thread: Single Character Validation

  1. #1
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    Default Single Character Validation

    Hello,
    I am having a bit of trouble validating single Chars inputted by the user for my intro to java class. I usually validate it with a while loop when its numbers (double, int, etc) but i cant seem to find a right way to validate these.


    the program is to ask the user to answer to a test of 20 questions ( A,B,C or D) and then store it in an array.This is what i have so far (minus the rest of the code). no syntax errors given by netbeans =/


    Scanner keyboard = new Scanner(System.in);

    System.out.println("Enter Your Answers for the Exam "
    + "(CAPS LOCK ON!)");

    for (int index = 0; index < 19; index++)
    {
    System.out.println("Enter Answer for Question #" + (index + 1)
    + ":");

    givenAnswers[index] = keyboard.next().charAt(0);

    while (givenAnswers[index] != 'A' || givenAnswers[index] != 'B' ||
    givenAnswers[index] != 'B'|| givenAnswers[index] != 'C')
    {
    System.out.println("Please Enter a Valid Answer (A,B,C, or D)");
    givenAnswers[index] = keyboard.next().charAt(0);
    }
    }

    this is what i get in the run window(its like its not validating at all??? and just keeps going) :

    run:
    Enter Your Answers for the Exam (CAPS LOCK ON!)
    Enter Answer for Question #1:
    A
    Please Enter a Valid Answer (A,B,C, or D)
    B
    Please Enter a Valid Answer (A,B,C, or D)
    C
    Please Enter a Valid Answer (A,B,C, or D)
    D
    Please Enter a Valid Answer (A,B,C, or D)

    any thoughts?? thanks in advanced


  2. #2
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    Default Re: Single Character Validation

    while (givenAnswers[index] != 'A' || givenAnswers[index] != 'B' ||
    givenAnswers[index] != 'B'|| givenAnswers[index] != 'C')

    It would seem that what you're saying is, with the or, that the loop should continue while givenAnswers[index] is not equal to ALL of those. Try it with && instead of ||.

    Also, you seem to have B in there twice.

  3. #3
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    Default Re: Single Character Validation

    IT WORKEDDD!! THANK YOU!! and yeah i noticed the two b's there too. I changed them now.

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