【HDOJ】1314 Numerically Speaking

学了几天的Java了，终于独立A了一道大数计算。感觉还得练Java啊。

 import java.util.Scanner;
 import java.math.BigInteger;
 import java.lang.StringBuilder;

 public class Main {
     public static void main(String[] args) {
         Scanner cin = new Scanner(System.in);
         while (cin.hasNextLine()) {
             String line = cin.nextLine();
             char l0 = line.charAt();
             if (l0 == '*')
                 break;
             if (l0>='' && l0<='') {
                 StringBuilder builder = new StringBuilder();
                 BigInteger x = new BigInteger(line);
                 BigInteger div = new BigInteger("");
                 BigInteger[] vals = new BigInteger[];
                 while (x.compareTo(BigInteger.ZERO) != ) {
                     vals = x.divideAndRemainder(div);
                     char ch = (char)(vals[].intValue()+);
                     builder.append(ch);
                     x = vals[];
                 }
                 builder.reverse();
                 String ans = new String(builder.toString());
                 System.out.print(ans);
                 int l = ans.length();
                 while (l < WIDTH) {
                     System.out.print(' ');
                     ++l;
                 }
             } else {
                 int length = line.length();
                 System.out.print(line);
                 int l = length;
                 while (l < WIDTH) {
                     System.out.print(' ');
                     ++l;
                 }
                 BigInteger div = new BigInteger("");
                 BigInteger sum = new BigInteger(String.valueOf((int)(line.charAt(length-))-));
                 for (int i=length-; i>=; --i) {
                     // System.out.print("current sum = ");
                     // System.out.println(sum.toString());
                     BigInteger tmp = div.multiply(new BigInteger(String.valueOf((int)(line.charAt(i))-)));
                     sum = sum.add(tmp);
                     div = div.multiply(new BigInteger(""));
                 }
                 line = new String(sum.toString());
             }
             int length = line.length();
             int x = length%;
             x = (x==) ? :x;
             int j = ;
             for (int i=; i<length; ++i) {
                 if (i < x) {
                     System.out.print(line.charAt(i));
                 } else {
                     if ((j+)<length && (j%)==) {
                         System.out.print(',');
                     }
                     ++j;
                     System.out.print(line.charAt(i));
                 }
             }
             System.out.println();
         }
     }
     public static void reverse(byte[] bytes, int l) {
         byte tmp;
         for (int i=; i+i<l; ++i) {
             tmp = bytes[i];
             bytes[i] = bytes[l--i];
             bytes[l--i] = tmp;
         }
     }
     static final int WIDTH = ;
 }