HDU-多个大数加法问题

问题及代码：

/*  
*copyright (c)2014,烟台大学计算机与控制工程学院  
*All rights reserved.  
*文件名称：HDU.cpp  
*作    者：单昕昕  
*完成日期：2015年1月27日  
*版 本 号：v1.0  
*问题描述：One of the first users of BIT's new supercomputer was Chip Diller. He extended his exploration of powers of 3 to go from 0 to 333 and he explored taking varIoUs sums of those numbers. 
``This supercomputer is great,'' remarked Chip. ``I only wish Timothy were here to see these results.'' (Chip moved to a new apartment,once one became available on the third floor of the Lemon Sky apartments on Third Street.) 
*程序输入：The input will consist of at most 100 lines of text,each of which contains a single VeryLongInteger. Each VeryLongInteger will be 100 or fewer characters in length,and will only contain digits (no VeryLongInteger will be negative). 

The final input line will contain a single zero on a line by itself.
*程序输出：Your program should output the sum of the VeryLongIntegers given in the input. 


This problem contains multiple test cases!

The first line of a multiple input is an integer N,then a blank line followed by N input blocks. Each input block is in the format indicated in the problem description. There is a blank line between input blocks.

The output format consists of N output blocks. There is a blank line between output blocks.

Sample Input
1


123456789012345678901234567890
123456789012345678901234567890
123456789012345678901234567890
0

Sample Output
370370367037037036703703703670
*/
#include<iostream>
#include<cstring>
using namespace std;
int main()
{
    char str[100];
    int x,c,n,i,j,sum[110];
    cin>>n;
    while(n--)
    {
        memset(sum,sizeof(sum));
        c=0;
        while(cin>>str,strcmp(str,"0"))
        {
            for(i=j=strlen(str)-1; 0<=i; i--)
                sum[j-i]+=str[i]-'0';
        }
        for(i=0; i<110; i++)
        {
            x=sum[i]+c;
            sum[i]=x%10;
            c=x/10;
        }
        i=109;
        while(sum[i]==0)i--;
        if(i<0)cout<<"0";
        for(; i>=0; i--)
            cout<<sum[i];
        cout<<endl;
        if(n)cout<<endl;
    }
    return 0;
}

运行结果：

知识点总结：
多个大数加法问题。

学习心得：

跟小数加法差不多。。