UVA parity 10931

#include <stdio.h>
#include <string.h>
int main()
{
      long long int a,c;
        int i=0,count=0 , p;
        char s[10 ^ 10000];


   while(scanf("%lld",&a) == 1)
   {
       if(a == 0)
        break;
       printf("The parity of ");
      c = a;
       i = 0;
       count = 0;

       while(a != 0)
       {
           s[i] = a % 2;

           a =a / 2;

           count++;

           i++;
       }
       p  = 0;
       for(i = count - 1; i>= 0; i--)
       {
           printf("%d",s[i]);
           if(s[i] == 1)
            p++;
       }

       printf(" is %d (mod 2).\n",p);

   }
}