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const pointer:

char const * p;
const char * p;

both are same. p can point anywhere u want, but, will not be allowed to modify any data using this pointer.
p[1] = 'a'; //error

pointer to const:
char a = 'a';
char * const p = &a;
p can't point anywhere else, but can modify a's data.
char b = 'b';
p = &b; //err

BONUS: const pointer to const data.
char const * const p = &a;

Effective C++ by Scott Meyers, Item 21: Use const whenever possible.

Nopes , the anonymus guy is correct !!

I think most of the anonymous guy is correct.
But in my understanding,
const pointer is char * const p (pointer cannot point elsewhere after initialized)
pointer to const is const char * p (data cannot be changed).

The anonymous guy is not correct...
A const pointer is defined as "int * const ptr"..which means it can be made to point to an integer only once...and cannot be redirected to another...
Pointer to a const is declared as "int const * ptr"..which means it points to const integer and the pointer cannot be used to modify the value of integer it is pointing to

The anonymous guy is not correct...
A const pointer is defined as "int * const ptr"..which means it can be made to point to an integer only once...and cannot be redirected to another...
Pointer to a const is declared as "int const * ptr"..which means it points to const integer and the pointer cannot be used to modify the value of integer it is pointing to

- const Fred* p means "p points to a Fred that is const" — that is, the Fred object can't be changed via p.
- Fred* const p means "p is a const pointer to a Fred" — that is, you can change the Fred object via p, but you can't change the pointer p itself.

Correct answer:

char a='a',b='b';
const char * ptr=&a; // Pointer to const. *(ptr)='b'; //Invalid
char * const ptr=&a; // Const Pointer . ptr=&b ; //Invalid

Now consider the following three declarations assuming that char_A has been defined as a type char variable.:

const char * myPtr = &char_A;
char * const myPtr = &char_A;
const char * const myPtr = &char_A;

What is the difference between each of the valid ones? Do you know?

They are all three valid and correct declarations. Each assigns the addres of char_A to a character pointer. The difference is in what is constant.

The first declaration:

const char * myPtr

declares a pointer to a constant character. You cannot use this pointer to change the value being pointed to:

char char_A = 'A';
const char * myPtr = &char_A;
*myPtr = 'J'; // error - can't change value of *myPtr

The second declaration,

char * const myPtr

declares a constant pointer to a character. The location stored in the pointer cannot change. You cannot change where this pointer points:

char char_A = 'A';
char char_B = 'B';

char * const myPtr = &char_A;
myPtr = &char_B; // error - can't change address of myPtr

The third declares a pointer to a character where both the pointer value and the value being pointed at will not change.