/in/foo.cc: In function 'int main()':
/in/foo.cc:17:36: error: cast from 'char*' to 'int' loses precision [-fpermissive]
   for (int j = 2; j < sqrt(int(a[i]));j++)
                                    ^
/in/foo.cc:18:17: error: cast from 'char*' to 'int' loses precision [-fpermissive]
    if ((int(a[i]) % j) == 0) { cout << "NO" << endl; break; break; }
                 ^