Errors with beginning jOptionPane code

**LoganC** · September 28th, 2012, 08:52 AM

My assignment is to use jOptionPane to rewrite a program that we made earlier, I am successful so far except for the lines 51-53. Those used to be error free but after rewriting main using jOptionPane they are getting errors.

import java.util.Scanner;
import javax.swing.JOptionPane;
public class area {
 
 
    public static void main(String[] args) 
    {
        //Declaring Variables.
 
 
 
        double triOutput;
        int rectOutput;
        double circOutput;
 
 
 
 
 
 
        triOutput = 1;
 
        circOutput = 1;
        rectOutput = 1;
 
        Scanner reader = new Scanner (System.in);
 
        //Receiving Input
        System.out.println ("Which shape do you want area for?");
        System.out.println("1 Triangle 2 Circle 3 Rectangle 0 None");
        String whatShape = JOptionPane.showInputDialog("Shape Number?");
        int shapeNum = Integer.parseInt(whatShape);
        if (shapeNum == 1) {
            String whatBase = JOptionPane.showInputDialog("Triangle Base?");
            double triBase = Double.parseDouble(whatBase);
            String whatHeight = JOptionPane.showInputDialog("Triangle Height?");
            double triHeight = Double.parseDouble(whatHeight);
 
         }
       if (shapeNum == 2) {
 
            String whatRadi = JOptionPane.showInputDialog("What Radius?");
            double circRadi = Double.parseDouble(whatRadi);
        }
       if (shapeNum == 3) {
            System.out.println ("Length of rectangle?");
            String whatLength = JOptionPane.showInputDialog("What Length?");
            int lengthRect = Integer.parseInt(whatLength);
            String whatWidth = JOptionPane.showInputDialog("What Width?");
            int widthRect = Integer.parseInt(whatWidth);                 
        }
 
     areaTriangle (triHeight, triBase, triOutput, shapeNum);  
     areaCircle (circOutput, circRadi, shapeNum);
     areaRectangle (rectOutput, lengthRect, widthRect, shapeNum);
 
 
    }
    public static void areaTriangle(double triBase,double triHeight, double triOutput, int shapeNum) {
        triOutput = (triBase*triHeight)/2;
          if (shapeNum == 1 ){
         System.out.println(triOutput);
              }
            }
    public static void areaCircle (double circOutput,double circRadi, int shapeNum )
      {
       circOutput = (Math.pow (circRadi, 2)*Math.PI);    
             if(shapeNum == 2 )
        {
        System.out.println(circOutput);
        }
 
       }
 
    public static void areaRectangle(int rectOutput, int lengthRect, int widthRect, int shapeNum) {
        rectOutput = lengthRect*widthRect;
          if(shapeNum == 3 ) {
        System.out.println(rectOutput);
  }  
     }
}

**Norm** · September 28th, 2012, 09:13 AM

they are getting errors.

When you get errors, you need to copy the full text of the error messages and paste it here so we can see what the errors are.

**LoganC** · September 28th, 2012, 09:17 AM

Getting cannot find symbol errors in main:

areaTriangle (triHeight, triBase, triOutput, shapeNum);  
     areaCircle (circOutput, circRadi, shapeNum);
     areaRectangle (rectOutput, lengthRect, widthRect, shapeNum);

When running the program:

Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - Erroneous tree type: <any>
at area.main(area.java:53)

**Norm** · September 28th, 2012, 09:23 AM

cannot find symbol errors

You need to post the full text of the compiler's error message that shows the line where the error occurred and the symbol that is not found.

Here is a sample:

TestSorts.java:138: cannot find symbol
symbol  : variable var
location: class TestSorts
         var = 2;
         ^

This shows the source line and the symbol.

The compiler is saying that the code is using symbols that are not defined. Look at the source statement with the error and determine what variable needs a definition.

**LoganC** · September 28th, 2012, 09:28 AM

The only error I am getting from compiler is
Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - Erroneous tree type: <any>
at area.main(area.java:53)
Java Result: 1

I am using NetBeans.

Off to the side it's saying:
Cannot find symbol, triHeight, triBase, circRadi, lengthRect, widthRect.

**Norm** · September 28th, 2012, 09:33 AM

That's a problem with some IDEs. The don't give you error messages that can be copied to a forum where you are asking for help. Until you can get a listing of the compiler's error mesages, you'll have to wait until someone will copy your code and put it in their compiler. The problem with that approach is that you never will be able to get help without that person copying your code to his compiler.

Cannot find symbol, triHeight, triBase, circRadi, lengthRect, widthRect.

Where are those variables defined? Are their definitions in scope with where they are being referencecd?(the definition is inside the same pair of {}s as where they are being used). Look up the definition of scope for more info

Move the variable definitions up to some levels to where they can be seen where you are using them.

**LoganC** · September 28th, 2012, 09:36 AM

Variables are defined below

if (shapeNum == 1) {
            String whatBase = JOptionPane.showInputDialog("Triangle Base?");
            double triBase = Double.parseDouble(whatBase);
            String whatHeight = JOptionPane.showInputDialog("Triangle Height?");
            double triHeight = Double.parseDouble(whatHeight);
 
         }
       if (shapeNum == 2) {
 
            String whatRadi = JOptionPane.showInputDialog("What Radius?");
            double circRadi = Double.parseDouble(whatRadi);
        }
       if (shapeNum == 3) {
            System.out.println ("Length of rectangle?");
            String whatLength = JOptionPane.showInputDialog("What Length?");
            int lengthRect = Integer.parseInt(whatLength);
            String whatWidth = JOptionPane.showInputDialog("What Width?");
            int widthRect = Integer.parseInt(whatWidth);

**LoganC** · September 28th, 2012, 09:36 AM

As far as scope, we haven't learned about that in class yet.

**Norm** · September 28th, 2012, 09:39 AM

your problem is with the scope of the definitions of the variables. The definition is NOT known outside of the enclosing {}s.

{  //  begin scope for x
   int x = 20;
}  // end scope for x
// x is  not known here

**LoganC** · September 28th, 2012, 09:43 AM

Any insight on going about fixing this? If statements make this hard.

**Norm** · September 28th, 2012, 09:46 AM

Move the definitions of the variables so they are in scope. That usually means putting the definitions within the same set of {}s.
The first set of {}s is for a class.
The next set of {}s is for a method (and others like static blocks)
Within methods there are {}s used by if and while statements for example.

**LoganC** · September 28th, 2012, 09:52 AM

Thanks Norm.

**jamesR** · September 29th, 2012, 12:23 PM

I would suggest putting the area outputs in the initial if statements with asking fr the base that might make it easier to look at.

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