20번

package JavaFestival;

import java.util.Scanner;

public class jar20 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		System.out.print("정수 입력 : ");
		int a = sc.nextInt();
		int num=0;
		
		while(true) {
			num+=a%10;
			a/=10;
			if(a/10==0) {
				num+=a%10;
				break;
			}
		}
		System.out.println("합은 "+num+"입니다.");
	}
}