The system indicates that this task is completed, but an error occurred during the verification process. how do I change it?

public class Solution {
    public static void main(String[] args) throws Exception {
        printCircleCircumference(2);
    }
    public static void printCircleCircumference(int radius) {

        double pi = 3.14;
        double C = 2 * pi * radius;
        System.out.print(C);   //result=31.400000000000002
    }

}