The access modifier keyword const is a promise the programmer makes to the compiler that the value of a variable will not be changed after it is initialized. The compiler will enforce that promise as best it can by not enabling the programmer to write code which modifies a variable that has been declared const.

A ?const pointer,? or more correctly, a ?pointer to const,? is a pointer which points to data that is const
(constant, or unchanging). A pointer to const is declared by putting the word const at the beginning of the pointer declaration. This declares a pointer which points to data that can?t be modified. The pointer itself can be modified. The following example illustrates some legal and illegal uses of a const pointer:

const char *str = ?hello?;
char c = *str /* legal */
str++; /* legal */
*str = ?a?; /* illegal */
str[1] = ?b?; /* illegal */

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