Spring Semester 2002
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Spring Semester 2002 |
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class One extends Applet implements MouseListener,
MouseMotionListener {
String where = "out";
public void init() {
addMouseListener(this); addMouseMotionListener(this);
}
public void paint(Graphics g) {
if (where.equals("in")) { System.out.println("No smile."); }
else { System.out.println("Broad smile."); }
}
public void mouseMoved(MouseEvent e) { System.out.println("A-ha!"); }
public void mouseDragged(MouseEvent e) { }
public void mouseClicked(MouseEvent e) { }
public void mousePressed(MouseEvent e) { }
public void mouseReleased(MouseEvent e) { }
public void mouseExited(MouseEvent e) {
where = "out";
repaint();
}
public void mouseEntered(MouseEvent e) {
where = "in";
repaint();
}
}
The lab assignment you start working on today
should help you with Homework Six.
A201/A597
LAB ASSIGNMENT TWELVE
You may safely assume that your only operands are integers and that the
names of variables are comprised of only alphabetical characters. You do
not need to do any exquisite error-checking (it is OK for your program
to exit with an error message if the user makes a mistake as long as all
correctly written expressions are evaluated correctly). Help is available,
but please refer to it only after you have exhausted your very own
resources. Here's the help I can offer, to help you get
started. frilled.cs.indiana.edu%javac Eval.java
frilled.cs.indiana.edu%java Eval
Arithmetic Evaluator 1.0 Copyright A201 Systems Ltd.
Eval> 1
1
Eval> 1 + 2
3
Eval> 1 + 2 * 3
7
Eval> 1 * 2 + 3
5
Eval> a = 2
2
Eval> a
2
Eval> a = a + 3
5
Eval> a
5
Eval> b = 1
1
Eval> c = a + b
6
Eval> a
5
Eval> b
1
Eval> c
6
Eval> c = c * a + b
31
Eval> c
31
Eval> exit
frilled.cs.indiana.edu%