poj 1503 大数相加(java)

代码：

import java.math.*;
import java.util.Scanner;

public class Main {
	public static void main(String args[]){
		Scanner cin = new Scanner(System.in);
		BigInteger sum,a;
		sum = BigInteger.valueOf(0);
		while(true){
			a = cin.nextBigInteger();
			if(a.equals(BigInteger.valueOf(0)))
				break;
			sum = sum.add(a);
		}
		System.out.println(sum);
	}
}