Thread: How to convert from type double to type int?

I need to convert the result of a calculation from type double to type int, what's the best way of going about this?
I need to do this because I need the results of the calculation to be the length of a rectangle that will be drawn.
Many thanks

You can cast it: int i = (int)1.3;

Ok I think I got that, but BlueJ is saying that I'm having an error still.

import java.awt.*;
import javax.swing.*;
 
public class goldenrect extends JApplet
{
double length;
public void init()
{
String shortSide;
double shortnumb;
 
shortSide = 
JOptionPane.showInputDialog ("Enter the length of the shorter side in pixels");
 
shortnumb = Integer.parseInt( shortSide );
 
length = shortnumb * 1.6180339887;
 
int shortnumb2 = (int) shortnumb;
 
int length2 = (int) length;
}
public void paint ( Graphics g )
{
g.drawRect( 15, 10, length2, shortnumb2 );
g.drawString( "The length of the longer side is " + length, 25, 25);
}
}

It says that it cannot find the symbol- variable length2
Any ideas? Any help is greatly appreciated

What line is the error on?

Is length2 a local variable in a method?
or is it a class variable know to all methods?

Local variables are only known in the method (or enclosing {}s) they are defined in.

Yeah that's what the problem was, I hadn't declared length2 as a class variable, thanks
However now I have the problem that the conversion from double to int makes the int value 0, any ideas why this might be?


import java.awt.*;
import javax.swing.*;

public class goldenrect extends JApplet
{
double length, shortnumb;
int length2, shortnumb2;
String shortSide;
public void init()
{
String shortSide;
double shortnumb;

shortSide =
JOptionPane.showInputDialog ("Enter the length of the shorter side in pixels");

shortnumb = Double.parseDouble( shortSide );

length = shortnumb * 1.6180339887;

int shortnumb2 = (int) shortnumb;

int length2 = (int) length;

}
public void paint ( Graphics g )
{

g.drawRect( 15, 10, length2, shortnumb2 );
g.drawString( "The length of the longer side is " + length, 25, 25);
}
}

Never mind I've figured it out myself, I just had to move

int shortnumb2 = (int) shortnumb;

int length2 = (int) length;

into the public void paint class.
Thanks for all your help

you can parse.. or change data type into INT.. or cast