C + + constant pointers and pointer constants

1. Constant pointer

Definition and use of pointer variables that point to constants

such as: const int *p;

2. Pointer constants

such as: char* const p = "ABCDE";

You can understand this:

The type char* of the const p, so p can not be modified. That is, the p must have been initialized at the time of definition and cannot be modified.

3. Pointer constants pointing to constants

Pointer constants pointing to constants

such as: const int* Const P = &b;

You can understand that.

int* the type of const P is const, then the int* const p is not modifiable.

And look at int* const p. The type of const p is int*, which is that p cannot be modified, and its type is int*.

Summarize:

No matter how the name of the pointer changes, it should be divided into a view. Start at the very beginning, layer by layer, and look at these names with the "Type-object" perspective.