hdu 1047 Integer Inquiry

#include<iostream>
#include<cstdio>
#include<cstring>
#include<cstring>
using namespace std;
int main(void)
{
int n,i,j,sum[110],c;
char s[110];
scanf("%d",&n);
while(n--)
{
memset(sum,0,sizeof(sum));
c=0;
while(scanf("%s",s)!=EOF)
{
if(strcmp(s,"0")==0)
break;
for(i=j=strlen(s)-1;i>=0;i--)
{
sum[j-i]+=s[i]-'0';
}
}
for(i=0;i<110;i++)
{
int x=sum[i]+c;
sum[i]=x%10;
c=x/10;
}
i=109;
while(sum[i]==0)
i--;
if(i<0)
printf("0");
for(;i>=0;i--)
printf("%d",sum[i]);
printf("\n");
if(n)
printf("\n");
}
return 0;
}