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);
}
}