UVA 11879 multiple 17(大数取模)

#include<cstdio>
#include<cstdlib>
#include<string>
#include<iostream>
#include<algorithm>
using namespace std;
int main()
{
    string str;
    int i,ans;
    while(getline(cin,str)&&str[0]!='0')
    {
        ans=0;
        for(i=0;i<str.length();i++)
           ans=(ans*10+str[i]-'0')%17;
        printf("%d\n",ans==0);
    }
}