poj1312

java中StringBuffer类似于C++中的String，append函数可以在其后面添加字符，reverse可以反转。

java中BigInteger的intValue方法可以将其转为int。

View Code

import java.io.*;
import java.util.*;
import java.math.*;


public class Main {
    final static int maxl = 50;
    static String translate(String temp)
    {
        StringBuffer ret = new StringBuffer(temp);
        for (int i = ret.length() - 3; i > 0; i -= 3)
            ret.insert(i, ",");
        return ret.toString();
    }
    static void translateToNumber(String st)
    {
        BigInteger ret = new BigInteger("0");
        for (int i = 0; i < st.length(); i++)
        {
            ret = ret.multiply(BigInteger.valueOf(26));
            ret = ret.add(BigInteger.valueOf(st.charAt(i) - 'a' + 1));
//            System.out.println(ret);
        }
        System.out.printf("%-22s%s\n", st, translate(ret.toString()));
    }
    
    static void translateToString(String st)
    {
        BigInteger a = new BigInteger(st);
        StringBuffer ans = new StringBuffer("");
        while (!a.equals(BigInteger.ZERO))
        {
            BigInteger temp = a.mod(BigInteger.valueOf(26));
            if (temp.equals(BigInteger.ZERO))
            {
                ans.append("z");
                a = a.subtract(BigInteger.valueOf(26));
            }else
                ans.append((char) (temp.intValue() + 'a' - 1));
            a = a.divide(BigInteger.valueOf(26));
//            System.out.println(a);
        }
        ans.reverse();
        System.out.printf("%-22s%s\n", ans, translate(st));
    }
    
    public static void main(String[] args) throws FileNotFoundException
    {
//        Scanner cin = new Scanner(new FileInputStream("t.txt"));
        Scanner cin = new Scanner(System.in);
        while (true)
        {
            String st = cin.next();
            if (st.equals("*"))
                break;
            if (st.charAt(0) <= 'z' && st.charAt(0) >= 'a')
                translateToNumber(st);
            else
                translateToString(st);
        }
    }
}