Refer to https://blog.csdn.net/u012611878/article/details/52534622
(1) # Include macro parameters in the string;
(2) ## Connection
(3) Pay attention to adding \
Refer to https://blog.csdn.net/u012611878/article/details/52534622
(1) # Include macro parameters in the string;
(2) ## Connection
(3) Pay attention to adding \