why does the input "2* pi * radius" shows that the verification is incorrect , but the input "2 * pi * radius" shows correct ?

public class Solution { public static void main(String[] args) { printCircleCircumference(5); } public static void printCircleCircumference(int radius) { //在此编写你的代码 double pi = 3.14 ; double score = 2* pi * radius ; System.out.println(score); } }