UVa-424-Integer Inquiry

// 424 - Integer Inquiry
#include <iostream>
#include <cstring>
using namespace std;
int main(void)
{
char s[200];    // at most 100 lines of text
int i, k, n, carry, a[200], t[200];
memset(a, 0, sizeof(a));
while(cin>>s && s[0]!='0')
{
k = 0;
carry = 0;
memset(t, 0, sizeof(t));

for(i=strlen(s)-1; i>=0; i--)
t[k++] = s[i] - '0';

for(i=0; i<200; i++)
{
carry += t[i] + a[i];
a[i] = carry % 10;
carry /= 10;
}
}

n = 200;
while(!a[--n]);
for(i=n; i>=0; i--)
cout << a[i];
cout << endl;
return 0;
}