OJ------超长整数相加

输入两个超长整数，求其运算结果

输入样例：999999999  1（string类型）

输出样例：1000000000

方法一：

API  new BigInteger().add();

方法二：个各位依次求解

import java.util.*;
public class Main{
public static void main(String[] args){
Scanner sc=new Scanner(System.in);
while(sc.hasNext()){
String s1=sc.next();
String s2=sc.next();
out(s1,s2);
}
sc.close();
}
public static void out(String s1,String s2){
    StringBuffer sb1=new StringBuffer(s1);
      StringBuffer sb2=new StringBuffer(s2);
     StringBuffer res=new StringBuffer();
    String ss1=sb1.reverse().toString();
    String ss2=sb2.reverse().toString();
char[] arr1=ss1.toCharArray();
char[] arr2=ss2.toCharArray(); 
//为了防止脚标越界，分出较长数组，和较短数组
if(arr1.length>arr2.length){
	char[] t=arr1;
	arr1=arr2;//min 
	arr2=t;//max
}
//int maxindex=arr1.length>arr2.length?arr1.length:arr2.length;
//int minindex=arr1.length>arr2.length?arr2.length:arr1.length;
int k=0;// 向前进的数
int result=0;
for(int i=0;i