/in/foo.cc: In member function 'void BigInt::print() const':
/in/foo.cc:365:54: warning: format '%d' expects argument of type 'int', but argument 2 has type 'll {aka long long int}' [-Wformat=]
     for (int i=pos-1; i>=0; --i) printf("%08d",val[i]);
                                                      ^