LB. LB. - 5 months ago 64
C Question

What is the difference between char * const and const char *?

What's the difference between:

char * const


const char *


The difference is that const char * is a pointer to a const char, while char * const is a constant pointer to a char.

The first, the value being pointed to can't be changed but the pointer can be. The second, the value being pointed at can change but the pointer can't (similar to a reference).

There is also a

const char * const

which is a constant pointer to a constant char (so nothing about it can be changed).


The following two forms are equivalent:

const char *


char const *

The exact reason for this is described in the C++ standard, but it's important to note and avoid the confusion. I know several coding standards that prefer:

char const


const char

(with or without pointer) so that the placement of the const element is the same as with a pointer const.