View Compilation Error

0_0_36701857_10282.cpp: In function 'int main()':
0_0_36701857_10282.cpp:24:18: error: cannot pass objects of non-trivially-copyable type 'std::string {aka class std::basic_string<char>}' through '...'
    scanf("%s",str);
                  ^
0_0_36701857_10282.cpp:44:15: error: cannot pass objects of non-trivially-copyable type 'std::string {aka class std::basic_string<char>}' through '...'
 scanf("%s",str);
               ^