第1个回答 2011-06-16
import java.util.Scanner;
public class Area {
public static void main(String[] args) {
System.out.println("请输入R1,R2");
Scanner sca=new Scanner(System.in);
double r1=sca.nextDouble();
double r2=sca.nextDouble();
Area a=new Area();
double a1=a.area(r1);
double z1=a.zhouchang(r1);
System.out.println(a1);
System.out.println(z1);
double a2=a.area(r2);
double z2=a.zhouchang(r2);
System.out.println(a2);
System.out.println(z2);
}
public double zhouchang(double r) {
double z=2*3.14*r;
return z;
}
public double area(double r) {
double a=3.14*r*r;
return a;
}
}