power java 만년 달력

package calender_b; import java.util.Scanner; public class Cal { public static void main(String[] args) { // TODO Auto-generated method stub Scanner str=new Scanner(System.in); System.out.print("년도를 입력하시오."); int year=str.nextInt(); System.out.print("월을 입력하시오."); int month=str.nextInt(); System.out.print("일을 입력하시오."); int day=str.nextInt(); System.out.print(year+"년"+month+"월"+day+"일 " + ""); int days= (year-1)*365+ (year/4) -(year/100)+ (year/400); switch (month) { case 12: days+=30; case 11: da...