Const char *, char * const, const char * const

Const char * CP;CP is a pointer to const char; CP is a pointer variable that points to a constant character. Note that CP is a pointer variable and points to const char, which means CP can point to other const char; note that CP points to const char, so you cannot use CP to modify const char;CP can point to other const char and use CP to modify const char is completely different.

Char const * CP; Same as above, the discrimination technique, const is on the left of *, so it is the same meaning.

Char * const CP;CP is a const pointer to Char, so obviously CP is a const point, so it cannot be changed, but the content of the memory block it points to can be changed

Const char * const CP;CP is a const pointer to const char,

Const char *, char * const, const char * const