C ++ virtual function table call learning

# Include "stdio. h "class Base {public: virtual void Fun1 () {printf (" Call Base Fun1 \ n ");} virtual void Fun2 () {printf ("Call Base Fun2 \ n");} virtual void Fun3 () {printf ("Call Base Fun3 \ n");} private: virtual void Fun4 () {printf ("Call Base Fun4 \ n") ;}}; class Derived: public Base {public: virtual void Fun1 () {printf ("Call Derived Fun1 \ n");} virtual void Fun5 () {printf ("Call Fun5 \ n") ;}}; typedef void (* Fun) (void); void main (void) {Derived lDerived; int ** lpVtableAdd = (int **) & lDerived; for (int I = 0; I <5; ++ I) {Fun lpFun = (Fun) (lpVtableAdd [0] [I]); lpFun () ;}printf ("First add of Base: % d, and first virtual Fun add: % d \ n ", (int *) (& lDerived), & lpVtableAdd );}