View Compilation Error

201657_0_29384.cpp
201657_0_29384.cpp(9) : error C2065: 'result' : undeclared identifier
201657_0_29384.cpp(9) : error C2679: binary '=' : no operator defined which takes a right-hand operand of type 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >' (or there is no acceptable conversion)