第四周作业-键盘输入数据 和 数据类型。

import java.util.Scanner;public class ComputeArea2 {public static void main(String args[]){final double PI = 3.14159;double area;double radius = 0.0;Scanner sc = new Scanner(System.in);while (sc.hasNextDouble ()){radius = sc.nextDouble ();area = PI*radius*radius;System.out.println("The area for the circle of 10 is"+area);}sc.close();area = PI*10*10;System.out.println("The area for the circle of 10 is" +area);}}