import java.util.Scanner;
public class Yuan {
public static void main(String[] args) {
double r;
double area,perimeter;
final double PI=3.14159265;
Scanner in=new Scanner(System.in);
r=in.nextDouble();
area=PI*r*r;
perimeter=2*PI*r;
System.out.printf("%.4lf",area);
System.out.printf("%.4lf",perimeter);
}
}

没看来哪错了

l有问题，去掉就输出了