Beginner -- Applet problems

[jcnews]

I am a beginner programmer just starting to learn Java. Can someone tell me
what is wrong with this applet?
The output is:
Circumference is 47.1225
Area is 176.70938
Volume is 1767.0938

I don't think that is the correct value of the volume because it is exactly
10 times the area.

What went wrong and also, is there an easier way to square or cube a number?

Thanks,
Josh

//Calculates circumference, area of circle and volume of sphere based on a
radius

import java.awt.*;
import java.applet.Applet;

public class Calculations extends Applet {
public void paint(Graphics g) {
float pi = 3.1415f;
float radius = 7.5f;
float circumference = 2.0f * pi * radius;
float area = pi * (radius * radius);
float volume = 4.0f * pi * (radius * radius * radius) / 3;
g.drawString("Circumference is: " + circumference, 50, 50);
g.drawString("Area is: " + area, 50, 75);
g.drawString("Volume is: " + volume, 50, 100);
}
}

[Murray]

"jcnews" <jc****@earthlink.net> wrote in message
news:FE*******************@newsread1.news.pas.eart hlink.net...

I am a beginner programmer just starting to learn Java. Can someone tell
me
what is wrong with this applet?
The output is:
Circumference is 47.1225
Area is 176.70938
Volume is 1767.0938

I don't think that is the correct value of the volume because it is
exactly
10 times the area.

What went wrong and also, is there an easier way to square or cube a
number?

Thanks,
Josh

//Calculates circumference, area of circle and volume of sphere based on a
radius

import java.awt.*;
import java.applet.Applet;

public class Calculations extends Applet {
public void paint(Graphics g) {
float pi = 3.1415f;
float radius = 7.5f;
float circumference = 2.0f * pi * radius;
float area = pi * (radius * radius);
float volume = 4.0f * pi * (radius * radius * radius) / 3;
g.drawString("Circumference is: " + circumference, 50, 50);
g.drawString("Area is: " + area, 50, 75);
g.drawString("Volume is: " + volume, 50, 100);
}
}

If you bothered to check yourself, you'd have found the area and volume
values are correct. 4/3 * 7.5 = 10

java.util.Math.pow(radius, 3);

[jcnews]

"Murray" <pa***@SMAFFoffSPAMMER.optusnet.SPAMMAGE.com.au> wrote in message
news:v9******************@news-server.bigpond.net.au...

"jcnews" <jc****@earthlink.net> wrote in message
news:FE*******************@newsread1.news.pas.eart hlink.net...

I am a beginner programmer just starting to learn Java. Can someone tell
me
what is wrong with this applet?
The output is:
Circumference is 47.1225
Area is 176.70938
Volume is 1767.0938

I don't think that is the correct value of the volume because it is
exactly
10 times the area.

What went wrong and also, is there an easier way to square or cube a
number?

Thanks,
Josh

If you bothered to check yourself, you'd have found the area and volume
values are correct. 4/3 * 7.5 = 10

java.util.Math.pow(radius, 3);

Thanks for your help. The last time I was in a math class was 14 years ago
and I have not used any math since. I ran it through on a calculator and
had came up with a different number so I figured there was something wrong.
I guess it was right.

Thanks again.

[Ian Shef]

"jcnews" <jc****@earthlink.net> wrote in
news:FE*******************@newsread1.news.pas.eart hlink.net:

I am a beginner programmer just starting to learn Java. Can someone
tell me what is wrong with this applet? <snip>
import java.awt.*;
import java.applet.Applet;

public class Calculations extends Applet {
public void paint(Graphics g) {
float pi = 3.1415f;

<snip>

In the future, you may want to consider using java.lang.math.PI

--
Ian Shef 805/F6 * These are my personal opinions
Raytheon Company * and not those of my employer.
PO Box 11337 *
Tucson, AZ 85734-1337 *

[jcnews]

"Ian Shef" <in*****@avoiding.spam> wrote in message
news:Xn****************************@138.126.254.21 0...

"jcnews" <jc****@earthlink.net> wrote in
news:FE*******************@newsread1.news.pas.eart hlink.net:

I am a beginner programmer just starting to learn Java. Can someone
tell me what is wrong with this applet?

<snip>

import java.awt.*;
import java.applet.Applet;

public class Calculations extends Applet {
public void paint(Graphics g) {
float pi = 3.1415f;

<snip>

In the future, you may want to consider using java.lang.math.PI

Ok... I have no idea what java.lang.math.PI is yet or how to use it because
I am just a couple of days into Java, but I will look into it. Thanks.