java已知一个圆的半径为2.3求此圆周长和面积

Question

java已知一个圆的半径为2.3求此圆周长和面积

Answer 1

程序更具体:
import java.util.*;
import static java.lang.System.*;
public lin
{
public static void main(String[] args)
{
// 输入圆半径r
Scanner in=new Scanner(System.in);
out.print("intput r:");
double r=in.nextDouble;
//求圆面积S
double S=PI*pow(r,2);
//求圆周A
double A=2*PI*r;
//输圆r,S,A
out.print("r:"+r+" "+"S:"+S+" "+"A:"+A);
}
}