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Thread: Volume of a sphere problem
 02112011, 06:37 PM #1Member
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Volume of a sphere problem
Hey, I got this problem for my school lab and I just don't get how to do it.
The problem is this.
"Write a method that takes in the radius of a sphere and returns it's volume the formula is v=4/2*3.14*r^3"
I don't really get how to do this r^3 business I know I have to use pow(double base, double exp) but it is not working for me.
Here is my code so far.
Java Code:public class math() { public double pow(double base, double exponent) { int v = (4/3)*3.14*pow; return v; } }
Last edited by dj_ee3; 02112011 at 06:40 PM.
 02112011, 06:45 PM #2
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'pow' is a method that takes two parameters (as you have described yourself). You are just writing it as 'pow', i.e. no parentheses, no parameters, no nothing. b.t.w. the pow method is implemented as a static method in the Math class, so it is Math.pow(r, 3)
kind regards,
JosBuild a wall around Donald Trump; I'll pay for it.
 02112011, 06:46 PM #3Senior Member
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pow()'s not working because you're not passing anything to it.
Try
Java Code:public double getVolumeOfSphere(double radius) { return volume = (4/3) * Math.PI * Math.pow(radius, 3); }
 02132011, 05:51 AM #4Member
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 02132011, 05:55 AM #5Senior Member
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 02132011, 05:58 AM #6Member
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 02132011, 06:01 AM #7Senior Member
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 02132011, 06:05 AM #8Member
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I am sorry... So when we do a program in my Java Class we do two types of classes the container classes which contain instance variables to hold the relevant data  getters and setters  methods to support moving data in/out of class (parsing, translation)  limited computations and such
And the driver classes that is a main method that drives the execution of the overall task (aka entry point for execution)  calls to static methods, as with procedural programming  instances of container class objects to hold different data (may be organized in other data structures, e.g. arrays; manipulated to solve overall task)
or simply how to I execute that return volume statement so I can see a result in a terminal window?Last edited by dj_ee3; 02132011 at 06:15 AM.
 02142011, 03:10 AM #9
I understand what you are talking about in regards to a Driver class, many beginner java classes are taught this way. The community has described how to use Math.pow(), are you still stuck with that?
To see the result of a function, you can simply print it:
Java Code:System.out.println(radiusOfASphere(3));
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