[SWEA] Digit sum

 

 

[문제]

https://swexpertacademy.com/main/code/problem/problemDetail.do?contestProbId=AWHPiSYKAD0DFAUn

SW Expert Academy

 

 

 

[소스 코드]

import java.io.*;
import java.util.*;
public class Solution {
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringTokenizer st;
		int T = Integer.parseInt(br.readLine());
		for(int tc=1;tc<=T;tc++) {
			String n = br.readLine();
			while(n.length()!=1) {
				int num = 0;
				for(int i=0;i<n.length();i++) {
					num += n.charAt(i) - '0';
				}
				n = String.valueOf(num);
			}
			System.out.println("#"+tc+" "+n);
		}
	}
}