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

Posted 2020-09-23 九月旧约

A+B for Input-Output Practice (IV)

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 105601    Accepted Submission(s): 55782

Problem Description

Your task is to Calculate the sum of some integers.

 

 

Input

Input contains multiple test cases. Each test case contains a integer N, and then N integers follow in the same line. A test case starting with 0 terminates the input and this test case is not to be processed.

 

 

Output

For each group of input integers you should output their sum in one line, and with one line of output for each line in input. 

 

 

Sample Input

4 1 2 3 4 5 1 2 3 4 5 0

 

 

Sample Output

10 15

 

 

Author

lcy

 

 

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怎么处理大数累加问题

import java.math.BigInteger;
import java.util.Scanner;
public class Main
{
    public static void main(String[] args)
    { 
        BigInteger a,b,d;
        String c = "0";
        d = new BigInteger(c);
        Scanner in = new Scanner(System.in);
        while(in.hasNextInt())
        {
            b = d;
            int t = in.nextInt();
            if(t == 0)
                break;
            for(int i=1;i<=t;i++)
            {
                a = in.nextBigInteger();
                b = a.add(b);//注意使用add方法时有返回值！！！
            }
            System.out.println(b);
        }
    }
}