const and pointers in C

Question

The use of const with a pointer can make the pointee not modifiable by dereferencing it using the pointer in question. But why neither can I modify what the pointer is not direc

Answer 1

Let's think about the type of the expressions.

const int* ptr = &a;

The type of ptr is const int*.

So the type of *ptr is const int. Not modifiable.

The type of (ptr + 2) is still const int* so the type of *(ptr + 2) is const int which is again not modifiable.