package xinjian;import java.util.Scanner;import javax.swing.BoundedRangeModel;public class lang {    public static void main(String[] args) {        // TODO 自动生成的方法存根        Scanner cs=new Scanner(System.in);        System.out.println("请输入圆的半径");        int a=cs.nextInt();                final double b=3.1415926;                System.out.println("圆的周长"+2*a*b+"用的面积"+a*a*b);    }}