java hdu A+B for Input-Output Practice (III)

A+B for Input-Output Practice (III)

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 113961    Accepted Submission(s): 60127

Problem Description

Your task is to Calculate a + b.

 

Input

Input contains multiple test cases. Each test case contains a pair of integers a and b, one pair of integers per line. A test case containing 0 0 terminates the input and this test case is not to be processed.

 

Output

For each pair of input integers a and b you should output the sum of a and b in one line, and with one line of output for each line in input. 

 

Sample Input

1 5
10 20
0 0

 

Sample Output

6
30

 

Author

lcy

 

值得注意的是怎么判断一个大数是否等于一个数，以及怎么把一个数转化为大数形式，注意大数实质上就是字符串

import java.math.BigInteger;
import java.util.Scanner;
public class Main//注意刷题时的java格式
{
    public static void main(String[] args)
    {
        BigInteger a,b,d;
        String c = "0";
        d = new BigInteger(c);//将c转化为大数形式，用d保存
        Scanner in = new Scanner(System.in);
        while(in.hasNextBigInteger())
        {
            a = in.nextBigInteger();
            b = in.nextBigInteger();
            if(a.compareTo(d) == 0 && b.compareTo(d) == 0 )//注意用一个大数类自带方法来判断两个大数是否相等
                break;
            System.out.println(a.add(b));
        }
    }
}