The Big Programming Thread - Page 259

public class Cone {

// variable names
public static double radius;
public static double height;
public static double slantheight;
public static double basearea;

// setting values to variables radius and height
public static void main(String[] args) {

radius = 0;
height = 0;
}

// sets up radius to iniRadius and height to iniHeight
public Cone(double iniRadius, double iniHeight) {

radius = iniRadius;
height = iniHeight;
}

// returns the current radius of the cone's base area
double getRadius() {
return radius;
}

// returns the current height of the cone
double getHeight(){
return height;
}

// returns the current slant height of the cone
public double getSlantHeight(){
return Math.sqrt(radius * radius + height * height);

}
//
public double getBaseArea(){
return Math.PI * (radius * radius);
}


// returns the current volume of the cone
public double getVolume(){
return 0.333333333 * Math.PI * (radius * radius * height);

}

// returns the current surface area of the cone
public double getSurfaceArea(){
return Math.PI * radius * Math.sqrt(radius * radius + height * height) + Math.PI * (radius * radius);

}


// changes the radius by a percentage
public void changeRadius(double byPercentage){

radius=radius+(radius*(byPercentage/100));
}


// changes the height by a percentage
public void changeHeight(double byPercentage){

height=height+(height*(byPercentage/100));



}
}

import java.util.Scanner;

//imports JOption Pop ups
import javax.swing.JOptionPane;

public class ConeTester {

/**
* @param args
*/


public static void main(String[] args) {

// Creates a Scanner for inputing values of radius and height
Scanner in = new Scanner(System.in);

// prompts user to enter a value for the radius
System.out.print("Please enter a radius for the cone:");
double radius = in.nextDouble();

// prompts user to enter a value for the height
System.out.print("Please enter a heigh for the cone:");
double height = in.nextDouble();


// creates Cone object
Cone myCone = new Cone(radius,height);

// calculates volume of cone
System.out.println("The volume of the cone is:");
System.out.printf("%5.2f\n",myCone.getVolume());

// calculates surface area of cone
System.out.println("The surface area of the cone is:");
System.out.printf("%5.2f\n",myCone.getSurfaceArea());

// calculates the current base area of the cone
System.out.println("The new base area of the cone is:");
System.out.printf("%5.2f\n",myCone.getBaseArea());

// calculates the current radius of the cone
System.out.println("The current raidus of the cone is:");
System.out.println(myCone.getRadius());

// calculates the current height of the cone
System.out.println("The current height of the cone is:");
System.out.println(myCone.getHeight());

// calculates the current slant height of the cone
System.out.println("The current slant heigh of the cone is:");
System.out.printf("%5.2f\n",myCone.getSlantHeight());

// This prompts the user to enter a percent change for the radius
String RadiusInput;
RadiusInput = JOptionPane.showInputDialog("Enter a percentage to change radius: ");
double RadiusPercent = Double.parseDouble(RadiusInput);
myCone.changeRadius(RadiusPercent);
System.out.println("The new volume of the cone is:");
System.out.println(myCone.changeRadius(RadiusPercent));

// This prompts the user to enter a percent change for the height
String HeightInput;
HeightInput = JOptionPane.showInputDialog("Enter a percentage to change height: ");
double HeightPercent = Double.parseDouble(HeightInput);
myCone.changeHeight(HeightPercent);

System.out.println("The new slant height of the cone is:");
System.out.println(myCone.changeHeight(HeightPercent));

}

}