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Thanks, it worked. I tried in a smaller program like this:



import java.text.DecimalFormat;

public class Matte {

public static final double PI = 3.14;

I defined PI like this: public static final double PI = 3.14;

It´s very strange. I made a simple program and copied your code, but I got the same fail.



import java.text.DecimalFormat;
...

Thanks for you both. I changed like this but it isn´t working correctly I got this result 28.0. It should be 28.26. And if I change the value of "h" in the main then I get this message:
...

I´m not sure if I did right but I did like this:



public static double volume (int r, int h)
{
DecimalFormat df = new DecimalFormat("#.##");
double volym=PI*r*r*h;
return...

Hi .. I would like to round off a number in a method and return the rounded number. I tried many different ways but I always got the same error message:

Matematik.java:70: error: incompatible...