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CS1 Course Site
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Programming Challenge Archive
Application Architectures
Objective Application Architecture
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The Problem
: A ``standard'' die measures some number of inches on the edge. Its spots measure one /fifth the edge length on the diameter. What percent of the die is white?
Write a program to solve the problem in a manner consistent with the Objective application architecture. Run the program twice. Enter the values 1.79 and 5.43 as data on the successive runs.
JavaApplication --
Objective Application Architecture
// General Information
// ---------------------------------------------------
// File: PercentWhite.java
// Type: java application file
// Date: Tue Oct 24, 2000
// Name: James W. Bremenour
// Line: Calculates the percentage of white on a die
// Application Description
// ---------------------------------------------------
/*
Calculates the percentage of white on a die
*/
// Required Packages
// ---------------------------------------------------
import blue.io.*;
import blue.shapes.*;
// Application Class
// ---------------------------------------------------
class PercentWhite
{
static public void main (String args[])
{
IO.println("Edge length? ");
Die d = new Die( IO.read_double() );
IO.print("The die is: " + d.whitePercent());
IO.print(" percent white.");
IO.println();
}
}
class Die
{
// Instance variables
private double diameter;
private double totalArea;
private double blackArea;
private double whiteArea;
// Constructor
public Die(double edge)
{
int nrFaces = 6;
int nrDots = 21;
diameter = edge/5.0;
Square face = new Square(edge);
Circle dot = new Circle(diameter/2.0);
totalArea = face.area() * nrFaces;
blackArea = dot.area() * nrDots;
whiteArea = face.area()-blackArea;
}
// Necessary other methods
// The use of a variable is incase I need to
// debug it
public double whitePercent()
{
double wP = (whiteArea/totalArea)*100;
return wP;
}
}
// Demo
// ---------------------------------------------------
/*
$ java PercentWhite
Edge length?
1.79
The die is: 5.671092379102391 percent white.
$ java PercentWhite
Edge length?
5.43
The die is: 5.671092379102391 percent white.
$
*/
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