c ++ member function of a null pointer access

#include <the iostream>
 the using  namespace STD;
 class Person {
 public :
     int Age;
     void showClass () { 
        COUT << " This is the class Person " << endl; 
    } 
    void showAge () {
         // the solution, if it is empty direct return 
        IF ( the this == NULL) {
             return ; 
        } 
        COUT << " age: " << the this -> Age << endl; 
    } 
};
voidTest () { 
    the Person * P = NULL;
     // p-> showAge (); will be given as null pointer access member properties feasible 
    p-> showClass (); 
} 
int main () { 
    Test (); 
    System ( " PAUSE " );
     return  0 ; 
}