解法一：字符串处理

一个简单的字符串处理问题。注意用字符串读入和输出格式。

import java.util.*;
import java.io.*;
public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
        String[] dict = new String[]{
                "zero", "one", "two", "three", "four",
                "five", "six", "seven", "eight", "nine",
        };
        String num = in.readLine();
        int sum = 0;
        for (char i : num.toCharArray()) {
            sum += i - 48;
        }
        num = String.valueOf(sum);
        for (int i = 0; i < num.length(); ++i) {
            int x = num.charAt(i) - 48;
            if (i == 0) {
                out.print(dict[x]);
            } else {
                out.print(" " + dict[x]);
            }
        }
        out.println();
        out.flush();
    }
}