error C2061: syntax error : identifier
c++, syntax-error
Solution
You have a circular dependency of header files. You need to break this circular inclusion dependency by using a forward declaration in `XuatChuoiBTHang.h`:
class BieuThucHang;
Also, remove `#include "BieuThucHang.h"` from `XuatChuoiBTHang.h`.
Problem
Here is my C++ code ``` // XuatChuoiBTHang.h #pragma once #include "BieuThuc.h" #include "BieuThucHang.h" class XuatChuoiBTHang { public: virtual string xuatChuoi(BieuThucHang* btHang) = 0; }; // BieuThucHang.h #pragma once #include "bieuthuc.h" #include "XuatChuoiBTHang.h" class BieuThucHang : public BieuThuc { private: XuatChuoiBTHang* xuatChuoiBTHang; }; ``` Ouput is: "error C2061: syntax error : identifier 'BieuThucHang' " How to fix it ?