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View Compilation Error

0_0_10310891_12452.cpp: In function `std::string add(std::string, std::string)':
0_0_10310891_12452.cpp:8: error: invalid use of member (did you forget the `&' ?)
0_0_10310891_12452.cpp:8: error: invalid use of member (did you forget the `&' ?)
0_0_10310891_12452.cpp:14: error: invalid use of member (did you forget the `&' ?)
0_0_10310891_12452.cpp:14: error: invalid use of member (did you forget the `&' ?)
0_0_10310891_12452.cpp: In function `int main()':
0_0_10310891_12452.cpp:45: error: argument of type `size_t (std::basic_string<char, std::char_traits<char>, std::allocator<char> >::)() const' does not match `int'
0_0_10310891_12452.cpp:46: error: argument of type `size_t (std::basic_string<char, std::char_traits<char>, std::allocator<char> >::)() const' does not match `int'
0_0_10310891_12452.cpp:49: error: argument of type `size_t (std::basic_string<char, std::char_traits<char>, std::allocator<char> >::)() const' does not match `int'
0_0_10310891_12452.cpp:65: error: argument of type `size_t (std::basic_string<char, std::char_traits<char>, std::allocator<char> >::)() const' does not match `int'


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