# include 
using namespace std; 

Class A 
{
Public: 
Void virtual show () {cout<" Class A "& lt; Void the view () {cout<" Class A view "& lt; }; 

Class B: public A 
{
Public: 
Void the show () {cout<" Class B "& lt; Void sh () {cout<" Class B sh & lt;" }; 

Class C: public B 
{
Public: 
Void the show () {cout<" Class C "& lt; Void sh () {cout<" Class C sh & lt;" }; 

Void main () 
{
A, A, * pa=& amp; a; 
B, B * pb=& amp; b; 
C C; 
Pa - & gt; Show (); 
Pa=& amp; b; 
Pa - & gt; Show (); 
Pa=& amp; c; 
Pa - & gt; Show (); 
(B *) (pa) - & gt; Show (); 
(B *) (pa) - & gt; Sh (); 
(pa) (C *) - & gt; Show (); 
(pa) (C *) - & gt; Sh (); 
(pa) (C *) - & gt; The view (); 
getchar(); 
} 

To solve, don't understand why the four last sentence is that

 (pa) (B *) - & gt; Show (); 
(B *) (pa) - & gt; Sh (); 
(pa) (C *) - & gt; Show (); 
(pa) (C *) - & gt; Sh (); 

CodePudding user response:

Casts a pointer type