第四周作业-键盘输入数据 和 数据类型

import java.util.Scanner;public class ComputerArea {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 is "+area);}sc.close();}}