Need help with rounding numbers in Java

Question

I finally have this program to where it needs to be except for one thing. The variable "freetime" isn't showing any kind of output in the applet. The variable sum and freetime are both called at the start of the program, and have equations to figure out the output for them, but only sum shows an output. I tried using brackets as opposed to multiple parentheses. What can I do to fix this so that there is an output? I was thinking of using something to round up the result, but I can't figure it out. Can anyone help?
import java.awt.*;
import javax.swing.*;
public class FinalLab extends JApplet{
String firstNum, secondNum, thirdNum, fourthNum, fifthNum;
int personal, family, school, work, sleep, sum, freetime;
public void init()
String firstNum, secondNum, thirdNum, fourthNum, fifthNum;
firstNum = JOptionPane.showInputDialog( "Enter total personal hours." );
secondNum = JOptionPane.showInputDialog( "Enter total family hours." );
thirdNum = JOptionPane.showInputDialog( "Enter total school hours." );
fourthNum = JOptionPane.showInputDialog( "Enter total work hours." );
fifthNum = JOptionPane.showInputDialog( "Enter total sleep hours." );
personal = Integer.parseInt( firstNum );
family = Integer.parseInt( secondNum );
school = Integer.parseInt( thirdNum );
work = Integer.parseInt( fourthNum );
sleep = Integer.parseInt( fifthNum );
sum = (personal + family + school + work + sleep);
freetime = ((168-sum)/168)*100;
public void paint(Graphics g) {
super.paint( g );
g.drawRect( 15, 10, 270, 20 );
g.drawRect( 15, 35, 270, 20 );
g.drawRect( 15, 60, 270, 20 );
g.drawRect( 15, 85, 270, 20 );
g.drawRect( 15, 110, 270, 20 );
g.drawRect( 15, 135, 270, 20 );
g.drawRect( 15, 160, 270, 20 );
g.drawString( "Personal hours: " + personal, 25, 25);
g.drawString( "Family hours: " + family, 25, 50);
g.drawString( "School hours: " + school, 25, 75);
g.drawString( "Work hours: " + work, 25, 100);
g.drawString( "Sleep hours: " + sleep, 25, 125);
g.drawString( "Total hours: " + sum, 25, 150);
g.drawString( "Free time: " + freetime, 25, 175);
}

Answer 1

I am guessing that you really meant that you are seeing "Free time: 0" instead of what you said, which was that it wasn't showing any kind of output. (Your whole terminology is weird, you don't "call a variable" just for example.) If that's the case, it's because you are using integer division. You'll find that 27/168, for example, gives zero. I don't know why you are multiplying by 100 in your calculation and doing the division, perhaps you meant to return the free time as a percentage (in which case your output should say that), but since you are doing that you could do it this way:((168-sum)*100/168)Then you are doing 2700/168, which produces a reasonable number.