Item08. Pointers to Pointers
Pointer to pointers (multi-level pointers) and pointers are also different from the pointers ----------------------------------------------------------------------------------------------------------------------- ------------- 1, change the address of the pointer points to
Void Scanto (const char ** p, char c) {while (** p && ** p! = c) * p;} char s [] = "Hello, World!"; const char * cp = s ScanTo (& CP, ','); // Pointing ","
2, priority use of references void scanto (const char * & p, char c) {while (* p && * p! = C) p;
3, the difference between pointer and multi-level pointer 1) Pointer can be used in polymorphism, and multi-level pointers cannot
Circle * c = new circle; shape * s = c; // correct ... circle ** cc = & c; shape ** ss = cc; // error!
2) After adding const stiff, the non-pointer constant can assign a value to the pointer constant, but cannot assign a value to the multi-level pointer.
Char * S1 = 0; const char * s2 = S1; // correct ... char * a [max]; // aka char ** const char ** ps = a; // Error!
