java计算圆直径，周长，面积

import java.util.Scanner;

public class CircleCalculator {
public static void main(String[] args) {

    Scanner scanner = new Scanner(System.in);


    System.out.print("banjingshi ");
    double radius = scanner.nextDouble();


    double area = Math.PI * Math.pow(radius, 2);


    double circumference = 2 * Math.PI * radius;


    double diameter = 2 * radius;


    System.out.println("mianji " + area);
    System.out.println("zhouchang " + circumference);
    System.out.println("zhijing " + diameter);
}

}