here is the special edition, page 115, line 23rd:
I copied the program from his book, but when I tried to compile, the error messages came out:
E:\calculator.cpp(55) : error C2039: 'push_back' : is not a member of 'basic_string<char,struct std::char_traits<char>,class std::allocator<char> >'
Should I include a header file or write the function push_back by myself? Thank you very much.