CSCI A201/A597 Lab Notes 3 Spring 2000

This is in-lab assignment 2 due at the end of the lab next week (Feb 3-4, 2000).

Write a program in a file called Crossed.java which expects one argument on the command line. This argument represents a size. The program should be printing a square of that size with both diagonals drawn. Here's an example, a sample session with a prototype:

school.cs.indiana.edu%java Crossed 8
 * * * * * * * * *
 * *           * *
 *   *       *   *
 *     *   *     *
 *       *       *
 *     *   *     *
 *   *       *   *
 * *           * *
 * * * * * * * * *
school.cs.indiana.edu%java Crossed 16
 * * * * * * * * * * * * * * * * *
 * *                           * *
 *   *                       *   *
 *     *                   *     *
 *       *               *       *
 *         *           *         *
 *           *       *           *
 *             *   *             *
 *               *               *
 *             *   *             *
 *           *       *           *
 *         *           *         *
 *       *               *       *
 *     *                   *     *
 *   *                       *   *
 * *                           * *
 * * * * * * * * * * * * * * * * *
school.cs.indiana.edu%java Crossed 12
 * * * * * * * * * * * * *
 * *                   * *
 *   *               *   *
 *     *           *     *
 *       *       *       *
 *         *   *         *
 *           *           *
 *         *   *         *
 *       *       *       *
 *     *           *     *
 *   *               *   *
 * *                   * *
 * * * * * * * * * * * * *
school.cs.indiana.edu%

Test the following programs using the floppies that will be distributed to you in the labs (which contain the packages that we need for this class).

(Note: these files are listed here so that you can easily cut and paste them and test them in your lab. Don't expect to understand them, but expect a significant reading assignment for next Tuesday which should clarify them entirely).

Just make sure that when you compile and run these programs they are in the same directory with the folders that contain the packages on the floppies distributed by the lab coordinator. So just put the programs in the root folder of the floppy.

import element.*;

public class Printing {
    public static void main(String[] args) {
	ConsoleWindow c = new ConsoleWindow();
	c.out.print("Watson, come here!"); 
	c.out.println("  I want you!"); 
    } 
}

import element.*;

public class AgeInput {
    public static void main(String[] args) {
	ConsoleWindow c = new ConsoleWindow(); 
	c.out.println("How old are you?"); 
	double ageInYears = c.input.readDouble(); 
	c.out.println("I can't believe you're " + ageInYears + " years old!"); 
        c.out.println("So you're " + (ageInYears * 365) + " days old.");
    } 
}

import element.*;
import java.awt.Color;

public class SimpleDraw {
    public static void main(String[] args) {
	DrawingWindow d = new DrawingWindow(200, 200); 
	Pt mouse;
	final int radius = 2; 
	Circle nib = new Circle(0, 0, radius);
	d.setForeground(Color.red); 
	d.awaitMousePress();
	while (d.mousePressed()) {
	    mouse = d.getMouse();
	    nib.center(mouse); 
	    d.fill(nib); 
	} 
    } 
}

import element.*;

public class Intro {
    public static void main(String[] args) {
	DrawingWindow d = new DrawingWindow();
	ConsoleWindow c = new ConsoleWindow();
        Pt p; 

        c.out.println("Press the mouse in the drawing window."); 
	p = d.awaitMousePress(); 

        d.draw(p); 
	d.draw(new Circle(p, 10)); 

	p = d.awaitMouseRelease(); 

	c.out.print("Thanks!  You pressed at "); 
	c.out.println(p); 

        c.out.println("Press the mouse to stop the program."); 
	d.awaitMousePress(); 

	System.exit(0); 
    } 
}

import element.*;

public class Swim {
    public static void main(String[] args) {
	final double SECONDS_PER_HOUR = 60.0 * 60.0; 
	final double FEET_PER_MILE = 5280.0; 
	final double FEET_PER_METER = 39.37/12.0;
	final int POOL_SIZE = 50; 
	final double FEET_PER_LAP = POOL_SIZE * FEET_PER_METER; 

	ConsoleWindow c = new ConsoleWindow(); 
	String first, last;
	int laps, minutes, seconds; 
	double hours, distance, lapTime;

	c.out.println("What are your first and last names?"); 
	first = c.input.readString();
	last = c.input.readString(); 
	c.out.println("Thanks, " + first + "."); 
	c.out.println("How many " + POOL_SIZE + 
		      " meter laps did you swim?"); 
	laps = c.input.readInt(); 

	c.out.println("How long did it take you " + 
		      "((in minutes and seconds)?"); 

	minutes = c.input.readInt();
	seconds = c.input.readInt();

	seconds = seconds + 60 * minutes; 
	hours = seconds / SECONDS_PER_HOUR;

	lapTime = seconds / (double)laps;
	c.out.println("It took you, on average, " + 
		      lapTime + " seconds per lap."); 

	distance = laps * FEET_PER_LAP / FEET_PER_MILE; 

        c.out.println("Your average speed was " +
		      (distance/hours) +" miles/hour.");

	c.out.println("You swim about " + 
		      Math.round(SECONDS_PER_HOUR/lapTime) +
		      " laps per hour!"); 

    }
}

import element.*;

public class XMarks {
    public static void main(String[] args) {
	ConsoleWindow c = new ConsoleWindow();
	DrawingWindow d = new DrawingWindow(); 
	int centerX, centerY;
	final int RADIUS = 10; 

	c.out.println("Enter the coordinate of the X:"); 
	centerX = c.input.readInt();
	centerY = c.input.readInt(); 

	d.moveTo(centerX, centerY);
	d.move(-RADIUS, -RADIUS); 
	d.line(2*RADIUS, 2*RADIUS); 
	d.move(0, -2*RADIUS); 
	d.line(-2*RADIUS, 2*RADIUS);

    } 
}