View Compilation Error

0_0_35970104_23388.cpp: In function 'int main()':
0_0_35970104_23388.cpp:12:36: error: cannot pass objects of non-trivially-copyable type 'std::string {aka class std::basic_string<char>}' through '...'
  while (EOF != scanf("%s%s", s1, s2)) {
                                    ^
0_0_35970104_23388.cpp:12:36: error: cannot pass objects of non-trivially-copyable type 'std::string {aka class std::basic_string<char>}' through '...'