View Compilation Error

0_0_32400468_8713.cpp: In function 'int main()':
0_0_32400468_8713.cpp:11:29: error: cannot pass objects of non-trivially-copyable type 'std::string {aka class std::basic_string<char>}' through '...'
     while(scanf("%s%s",s1,s2))
                             ^
0_0_32400468_8713.cpp:11:29: error: cannot pass objects of non-trivially-copyable type 'std::string {aka class std::basic_string<char>}' through '...'