Newbie Question

[Wizard1988]

I am taking a Java class and recently we have been learning how to write programs with multiple classes. For one of my homework assignments i have to write a program which would calculate volume of a sphere. I have written the programm here is my code

class sphere{
public double radius;
public double pi = Math.PI;

void volume(){
System.out.print("When the radius of the sphere is "+radius);
System.out.println(" its volume is"+ (4*pi*(Math.pow(radius,3)/3)));
}
}
class spherecalc{
public static void main(String[]args){
int number = 0;

while(number<=10){
sphere firstsphere = new sphere();
firstsphere.radius = 1.234;

firstsphere.volume();
firstsphere.radius++;
number++;
}
}
}


Now what I have to do is, increase the radius of the sphere. The teacher showed us how to use the incriment operator "++". He did not require a loop statement, but i wanted to do it. My question is how would i increase the value of the radius from within the loop, because the way i tried did not work

[mnuttall]

Not sure exactly what you were trying to do. But you are creating a new object every loop and your ++ is never used.

Do the following before the loop.

sphere firstsphere = new sphere();
firstsphere.radius = 1.234;



And use a for loop instead of while. Works the same, for now.

[Wizard1988]

Thank you for help, i have gone over my code and resolved the problem with your help.
I have one more question. When I assign values to variable and multiply them together i get a number in engeenering notation, is there a way that i can keep the value of two numbers without it being returned in engeenering notation?

[mnuttall]

Not sure off the top of my head. Check out some of the java Math APIs.

[spandit]

Please take a look at java.text.DecimalFormat class.