/in/foo.cc: In constructor 'BigInt::BigInt(int)':
/in/foo.cc:24:27: warning: argument to 'sizeof' in 'void* memset(void*, int, size_t)' call is the same expression as the destination; did you mean to dereference it? [-Wsizeof-pointer-memaccess]
         memset(a,0, sizeof(a));
                           ^