[PAT] 1027 Colors in Mars （20 分） Java

People in Mars represent the colors in their computers in a similar way as the Earth people. That is, a color is represented by a 6-digit number, where the first 2 digits are for Red, the middle 2 digits for Green, and the last 2 digits for Blue. The only difference is that they use radix 13 (0-9 and A-C) instead of 16. Now given a color in three decimal numbers (each between 0 and 168), you are supposed to output their Mars RGB values.

Input Specification:

Each input file contains one test case which occupies a line containing the three decimal color values.

Output Specification:

For each test case you should output the Mars RGB value in the following format: first output #, then followed by a 6-digit number where all the English characters must be upper-cased. If a single color is only 1-digit long, you must print a 0 to its left.

Sample Input:

15 43 71

Sample Output:

#123456

package pattest;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

/**
 * @Auther: Xingzheng Wang
 * @Date: 2019/2/21 20:59
 * @Description: pattest
 * @Version: 1.0
 */
public class PAT1027 {
    static final int size = 3;
    static char[] num = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C'};

    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        String[] split = reader.readLine().split(" ");
        System.out.print("#");

        for (int i = 0; i < size; i++) {
            StringBuilder stringBuilder = new StringBuilder();
            int n = Integer.parseInt(split[i]);
            do {
                stringBuilder.append(num[n % 13]);
                n %= 13;
            } while (n != 0);
            if (stringBuilder.length() <= 1)
                System.out.print(num[0]);
            System.out.print(stringBuilder.reverse().toString());
        }
    }
}