Exercise01_09

 public class S{
 public static void main(String[] args){
 double w=4.5;
 double h=7.9;
 double d;
 double s;
 d=2*(w+h);
 s=w*h;
 System.out.println("面积为：" + s);
 System.out.println("周长为：" + d);
 }
 }