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Thread: Char type Comparisson

  1. #1
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    Default Char type Comparisson

    Hello everybody I知 a beginner in java, and I知 having problems trying to compare character in my program.
    I知 trying to have the user type a character and in the character it is not a correct one then tell the user to input the character again .

    thank in advance here is the code:

    import javax.swing.JOptionPane;
    public class test
    {
          public static void main(String[] args)
          {	
                String strnGrade = JOptionPane.showInputDialog("Enter the Grade for the course ");
                char grad = strnGrade.charAt(0);
                grad = Character.toUpperCase(grad);
                while  (grad != 'A' || grad != 'B' || grad != 'C' || grad != 'D' || grad != 'F')
                {
                       strnGrade = JOptionPane.showInputDialog
                       ("The Garde enter is invalid please enter the grade again");
                 }
           }
    }
    Last edited by solo_2101; April 25th, 2010 at 12:37 PM.


  2. #2
    Super Moderator helloworld922's Avatar
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    Default Re: Char type Comparisson

    Your logic is flawwed... You're asking grad to be 'A', 'B', 'C', 'D', and 'F' at the same time, which it can't.

    Switch the exclusive or logic to exclusive and (&&)

  3. The Following User Says Thank You to helloworld922 For This Useful Post:

    solo_2101 (April 25th, 2010)

  4. #3
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    Default Re: Char type Comparisson

    thank you now its working fine...wonderful
    here the new code

    import javax.swing.JOptionPane;
    public class test
    {
      public static void main(String[] args)
      {	
        String strnGrade = JOptionPane.showInputDialog("Enter the Grade for the course ");
        char grad = strnGrade.charAt(0);
        grad = Character.toUpperCase(grad);
        while  (grad != 'A' && grad != 'B' && grad != 'C' && grad != 'D' && grad != 'F')
        {
          strnGrade = JOptionPane.showInputDialog
          ("The grades for the course are invalid please enter the grade againg");
          grad = strnGrade.charAt(0);
          grad = Character.toUpperCase(grad);
        }
        System.out.println(grad);
      }
    }
    Last edited by solo_2101; April 25th, 2010 at 01:21 PM.

  5. #4
    mmm.. coffee JavaPF's Avatar
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    Default Re: Char type Comparisson

    I have marked this thread as solved

    You can do this yourself in the 'Thread Tools' menu at the top.
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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  6. #5
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    Default Re: Char type Comparisson

    thank you... i didn't know how to do it but now i know ; and thanks again
    Last edited by solo_2101; April 26th, 2010 at 10:45 PM.

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