Java作业 输入圆的半径计算输出圆的周长和面积

 1 package text1;
 2
 3 import java.util.Scanner;
 4
 5 public class text11 {
 6 public static void main(String[] args){
 7
 8     Scanner sc =new Scanner(System.in);
 9
10
11     System.out.print("输入圆的半径");
12     int a =sc.nextInt();
13
14
15     System.out.print("圆的周长是；"+a*2*3.14+"圆的面积是；"+a*a*3.14);
16
17 }
18 }