Converting Double to Int

I am running this code (well it's a snippet at least)...

Code:

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int number1;
int number2;
int Total

number1 = 16 * 4
number2 = 20 * 3

Total = number1 + number2

---

When doing a calculation does java auto convert Total to a Double even tho I have it declared as int?

Why do you think that it may convert the number?

Code Conventions for the Java Programming Language: Contents

Variable names should start with a lowercase letter.

db

Quote:

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Originally Posted by DarrylBurke

Code Conventions for the Java Programming Language: Contents

Variable names should start with a lowercase letter.

db

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Your right on that. I didn't mean to capitalize the "T" in total.

Quote:

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Originally Posted by Fubarable

Why do you think that it may convert the number?

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This is me totally guessing since I am a very newbie at Java, but when I run this code:

Code:

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JOptionPane.showMessageDialog("The result of " + total );

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It gives me about 4 different errors, and one of them said something (I will give an exact error in a few) about wrong type Double should be Int or something of that nature. Which left me curious if Java would auto-convert Int to Double

Your best bet would be to show us the full errors and the code they are occurring on.

Here is the code I am using:

Code:

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import javax.swing.JOptionPane;
import java.lang.Math;
public class TestThis
{
        public static void main (String args[])
        {
                String userInput;
                int oneNumber;
                double length;
                double distance;
                double allAround;
               
                userInput = JOptionPane.showInputDialog("Enter First Number");
               
                oneNumber = Integer.parseInt(userInput);
               
                length = (2 * oneNumber);
               
                distance = ((2 * Math.PI) * oneNumber);
               
                allAround = (Math.PI * oneNumber);
               
                JOptionPane.showMessageDialog(Null, + "The distance is " + oneNumber );
                System.exit(0);
        }
}

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What is the best way to show the errors?

Copy and paste them into here.
Presumably these are compilation errors?

This line:

Code:

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      JOptionPane.showMessageDialog(Null, +"The distance is " + oneNumber);

---

is completely wrong, though.
What is 'Null'?
And that first '+' is not needed.

Quote:

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Originally Posted by Tolls

Copy and paste them into here.
Presumably these are compilation errors?

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Nice I never knew you could copy/paste from the command prompt!! Here are the errors:

c:\A_Programs>javac j.java
j.java:19: error: possible loss of precision
circumference = (2 * Math.PI * radius);
^
required: int
found: double
j.java:21: error: possible loss of precision
area = (Math.PI * radius);
^
required: int
found: double
j.java:23: error: cannot find symbol
JOptionPane.showMessageDialog(Null, + "The circumference is " +
radius );
^
symbol: variable Null
location: class j
j.java:23: error: bad operand type String for unary operator '+'
JOptionPane.showMessageDialog(Null, + "The circumference is " +
radius );
^
4 errors

c:\A_Programs>javac TestThis.java
TestThis.java:23: error: cannot find symbol
JOptionPane.showMessageDialog(Null, + "The distance is " + oneNumber );
^
symbol: variable Null
location: class TestThis
TestThis.java:23: error: bad operand type String for unary operator '+'
JOptionPane.showMessageDialog(Null, + "The distance is " + oneNumber );
^
2 errors

Um, that's not the code you posted above.
At least not the stuff about j.java.
And the errors for TestThis.java are both on the line I highlighted...

Quote:

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Originally Posted by Tolls

Um, that's not the code you posted above.
At least not the stuff about j.java.
And the errors for TestThis.java are both on the line I highlighted...

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Dangit your right, sorry I have like 3 different ones that I was trying to see if this way would work, okay what about this way. I'll check the line of code you posted above and see if I can tinker with it to get the code functioning properly.

Quote:

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Originally Posted by Tolls

This line:

Code:

---

      JOptionPane.showMessageDialog(Null, +"The distance is " + oneNumber);

---

is completely wrong, though.
What is 'Null'?
And that first '+' is not needed.

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Should the code just read like this:

Code:

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      JOptionPane.showMessageDialog("The distance is " + oneNumber);

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Look at the API for JOptionPane and see, but as it stands that code is syntactically incorrect, before we even think about the API.

I am copying this code:

Code:

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JOptionPane.showMessageDialog(frame, "Eggs are not supposed to be green.");

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from this site:

How to Make Dialogs (The Java™ Tutorials > Creating a GUI With JFC/Swing > Using Swing Components)

And when I try to run it I get an error of:
c:\A_Programs>javac tes.java
tes.java:8: error: cannot find symbol
JOptionPane.showMessageDialog(frame, "Eggs are not supposed to b
e green.");
^
symbol: variable frame
location: class tes
1 error

That's saying you don't have a 'frame' variable, so presumably you don't.