View Compilation Error

0_0_22127922_18245.cpp: In function 'int main()':
0_0_22127922_18245.cpp:22:22: error: cannot pass objects of non-trivially-copyable type 'std::string {aka class std::basic_string<char>}' through '...'
   scanf("%s %s",s1,s2);
                      ^
0_0_22127922_18245.cpp:22:22: error: cannot pass objects of non-trivially-copyable type 'std::string {aka class std::basic_string<char>}' through '...'