import java.util.Scanner;
public class Main {
public static void main(String args[]) {
Scanner sc = new Scanner(System.in);
System.out.print("输入半径：");
int r = sc.nextInt();
sc.close();
double s = Math.PI * r * r;
double c = Math.PI * r * 2;
System.out.println("圆的面积：" + s + "，圆的周长：" + c);
}
}
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