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Thread: GUI Calculator: Adding Answer Button? Please Help

  1. #26
    Super Moderator Norm's Avatar
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    Default Re: GUI Calculator: Adding Answer Button? Please Help

    outside the if statements, it has no value.
    No, the answer variable will have a value anywhere in the method. It will default to zero and then can be changed anywhere by an assignment statement.
    Add printlns to show its value before and after all the if statements where it has a value assigned to it.

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    Default Re: GUI Calculator: Adding Answer Button? Please Help

    Quote Originally Posted by Norm View Post
    Add printlns to show its value before and after all the if statements where it has a value assigned to it.
    I'm confused right now.. Can you show me an example of how this works?
    Simplicity calls for Complexity. Think about it.

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    Super Moderator Norm's Avatar
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    Default Re: GUI Calculator: Adding Answer Button? Please Help

    public void aMethod() {
      int aMethodVar = 0;  // define this variable at the method level
      System.out.println("1aMethodVar=" + aMethodVar);  // show its value here
      if (cond) {
         int x = 0;  // define this variable inside of the if{} it goes away at the ending }
     
         // aMethodVar is known here
        aMethodVar = 234;  // change the value
      } // end of if x is now gone
      System.out.println("2aMethodVar=" + aMethodVar);  // show its value here 
      int anotherVar = 33; // define this variable at the method level
     
      if(cond2) {
         // anotherVar and aMethodVar are known here. x is NOT known
        aMethodVar = 432;  // change the value
      }
    } // end aMethod()
     System.out.println("3aMethodVar=" + aMethodVar);  // show its value here

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    Default Re: GUI Calculator: Adding Answer Button? Please Help

    I still don't understand how the println's make a difference.. It's fine though, I've moved onto a new project. Here's my completed calculator.

    FinalCalc.JPG

    Thank you for all your help, and patience.
    Simplicity calls for Complexity. Think about it.

  5. #30
    Super Moderator Norm's Avatar
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    Default Re: GUI Calculator: Adding Answer Button? Please Help

    I still don't understand how the println's make a difference
    They don't effect how your code executes.
    The printlns are for debugging. To show you what the values of variables are as the code executes.

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