Inheritance and interface 1

What is output by the following program:

# Include <iostream> using namespace STD; Class A {public: void virtual F () {cout <"A" <Endl ;}}; Class B: public A {public: void virtual F () {cout <"B" <Endl ;}}; int main () {A * pA = new (); // defines a pointer Pa of type A. Pa points to Class A pa-> F (); B * pb = (B *) Pa; // defines a pointer of type B, Pb also points to type a Pb-> F (); Delete Pa, PB; // deletes the addresses pointed to by PA and Pb, however, the pointer type of PA and Pb is still the PA of Class A = new B (); // PA points to Class B pa-> F (); Pb = (B *) Pa; pb-> F (); Return 0 ;}

This topic mainly deals with the problem of overwriting virtual functions. Virtual functions are covered by functions with the same name in the quilt class.

The output result is AABB.

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