Java作業 輸入圓的半徑計算輸出圓的周長和面積

package text1;

import java.util.Scanner;

public class text11 {
public static void main(String[] args){
    
    Scanner sc =new Scanner(System.in);
    
    
    System.out.print("輸入圓的半徑");
    int a =sc.nextInt();
    
    
    System.out.print("圓的周長是；"+a*2*3.14+"圓的面積是；"+a*a*3.14);
    
}
}